3 Partitions - ESI.infocms.esi.info/Media/documents/Lafar_drywalpartition_ML.pdf · Cormet Megadeco Partitions, non-loadbearing 28 3.8 100 60 40 Severe 60 ... PARTITIONS Performance

PARTITIONS 3

70

P A R T I T I O N SINTRODUCTION

TECHNICAL ENQUIRYLINE t 01275 377789 f 01275 377456 www.lafargeplasterboard.co.uk

Contents

Performance Tables 71

Cormet Twin Frame Systems 99

Cormet Resilient Bar Systems 107

Cormet Acoustic Stud Systems 113

Cormet C Stud Systems 123

Timber Stud Systems 133

Masonry Systems 139

Specialist Junctions and Installations 141

What Can Go Wrong Checklist 160

Cormet Twin Frame Systems

Cormet Twin Frame Systems offer anumber of advantages over heavymasonry construction. They arelightweight, quick to construct, cost-effective, compact and offerhigh levels of fire resistance andacoustic insulation.

Cormet Resilient Bar Systems

Use of Cormet Resilient Barimproves the acoustic performanceof partitions with little increase inwidth or weight. Cormet ResilientBars are fixed to one side of the studpartition prior to facing withwallboard.

Cormet Acoustic Stud Systems

The Cormet Acoustic HomespanPartition System uses sound absorbingC studs to achieve a 40 Rw dB soundrating, without insulation, in a75mm wide partition.

Cormet Omega Acoustic Stud hasbeen specially designed to givegreater sound insulation performancein the key frequency bands between250 Hz and 1,000 Hz. Used inconjunction with Cormet U Trackand accessories, Omega AcousticStud is particularly effective atreducing common daily noise suchas sound generated by stereos andother audio-visual equipment.

Cormet C Stud Systems

Cormet C Stud Systems allowguaranteed performance to beachieved across a broad range ofdomestic, commercial and industrialapplications. These systems providea cost-effective, versatile approachto the assembly of non-loadbearingpartitions.

Timber Stud Systems

Timber stud partitions are suitablefor limited heights and mainly usedin domestic installations. They areable to achieve high levels of fireresistance and sound insulation.

Masonry Systems

Traditional masonry constructionsremain the most popular form ofconstruction, accounting forapproximately 70% of all new builddwellings. Where such materials areused, drywall systems still have a keyrole to play in providing acoustic/thermal performance and finishingsolutions. A case in point is the Cormet Dryliner system whichoffers the developer quickercompletion by reducing reliance on wet trades and associated drying out times.

Specialist Junctions andInstallations

Creating special design features isgreatly simplified using Lafargedrywall systems which can bespecified - among others - fordeflection head details, junctions toconcrete, timber and floating floorconstructions, baffles, service andduct penetrations, dampers, doorframe details, boxed studs, columnencasements, movement joints, andcurved partitions. A range of fixingsis also available to accommodatedifferent fixtures and loadings.


P A R T I T I O N S

71

3

Performance tables

RMP 003

RMP 004

RMP 001

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de

Studs: 70mm Cormet C Stud (CS70/R) at600mm centres

Facings: one layer 15mm LafargeMegadeco wallboard both sides



Insulation: 25mm glass mineral wooldensity 16 kg/m3




Table 3.1Cormet Megadeco Partitions, non-loadbearing

28 3.8 100 60 40 Severe

60

29 3.8 100 60 49 Severe

60

30 3.8 100 60 50 Severe

60

System reference

RMP 009

RMP 050 Studs: 70mm Cormet C Stud (CS70/R) at600mm centres

Facings: inner layer 9.5mm LafargeStandard wallboard, outer layer 15mmLafarge Megadeco wallboard both sides



Facings: inner layer 12.5mm LafargeFirecheck or Megadeco wallboard, outerlayer 12.5mm Lafarge Megadecowallboard both sides

41 4.6 120 60 56 Severe

60

46 4.6 120 120 52 Severe

120


Facings: inner layer 12.5mm LafargeFirecheck or Megadeco wallboard, outerlayer 12.5mm Lafarge Megadecowallboard both sides


47 4.6 120 120 56 Severe

120

Specification

With studs at 400mm centres, maximum height can be increased by 0.30m for single layer boarding and 0.60m for double layer boarding. All maximum heightsbased on deflection L/240 Pa U.D.L. For partitions at 4.2m and above, Deep Flange U Track should be used at the partition head.

Performance values are for imperforate, jointed systems using only Lafarge components and installed to the Lafarge specification given. Any alterations maywell impair the quoted performance criteria.

The Deco system is not suitable for plastering. Refer to Section 7 for finishing details.

Rock mineral wool density 40 kg/m3 may be used in lieu of glass mineral wool as specified.

AMP 003 Studs: 70mm wide Omega Acoustic Stud(AS70/R) at 600mm centres


Insulation: 50mm glass mineral woolinsulation density 16 kg/m3

30 3.8 100 60 51 Severe

60

72

P A R T I T I O N S


Performance tables

Table 3.1 (ctd)Cormet Megadeco Partitions, non-loadbearing

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss (m

m)

Max

imum

hei

ght

(m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de

System reference Specification



28 4.2 120 60 42 Severe

60




29 4.2 120 60 50 Severe

60

RMP 130





Facings: inner layer 12.5mm LafargedBcheck wallboard, outer layer 12.5mmLafarge Megadeco wallboard both sides


30 4.2 120 60 51 Severe

60

45 4.8 140 90 57 Severe

90


Facings: inner layer 15mm LafargedBcheck wallboard, outer layer 15mmLafarge Megadeco wallboard both sides


46 5 150 120 58 Severe

90


Facings: inside layer 15mm LafargedBcheck wallboard between studs, outerlayer 15mm Lafarge Firecheck wallboard orMegadeco wallboard both sides


38 4.2 120 60 53 Severe

60





Table 3.1 (ctd)Cormet Megadeco Partitions, non-loadbearing

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss (m

m)

Max

imum

hei

ght

(m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de



P A R T I T I O N S

73

3

Performance tables


Facings: inner layer 15mm LafargedBcheck wallboard, outer layer 15mmLafarge Firecheck wallboard or Megadecowallboard both sides


55 5.0 150 90 60 Severe

90 -7 Ctr



Insulation: 75mm glass mineral woolinsulation density 10.5 kg/m3

31 4.2 120 60 52 Severe

60

RMP 062

RMP 075

Studs: 146mm Cormet C Stud (CS146/Y) at600mm centres


Studs: 146mm Cormet C Stud (CS146/Y) at600mm centres



38 6.5 175 60 42 Severe

60

39 6.5 175 60 52 Severe

60

RMP 038 Studs: two 50mm Cormet C Stud (CS50/R)at 600mm centres, braced horizontallywith Cormet V Brace at max. 1.5m centres

Facings: inner layer 15mm LafargedBcheck wallboard, outer layer 15mmLafarge Megadeco wallboard both sides


56 4.2 200 120 63 Severe

90 -7 Ctr





74

P A R T I T I O N S


Performance tables

RRP 055

RRP 052

RRP 049

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de

Studs: 70mm Cormet C Stud (CS70/B)* at600mm centres

Facings: one layer 12.5mm LafargeToughcheck wallboard both sides


Facings: one layer 12.5mm LafargeToughcheck wallboard both sides



Facings: two layers 12.5mm LafargeToughcheck wallboard both sides

Table 3.2Cormet Toughcheck Partitions, non-loadbearing

27 4.2 95 60 39 Heavy

30

28 4.2 95 60 47 Heavy

30

47 5.4 120 120 52 Severe

120

System reference

RRP 053

RRP 048 Studs: 70mm Cormet C Stud (CS70/B)* at600mm centres



Studs: 146mm Cormet C Stud (CS146/B)*at 600mm centres


53 5.4 120 120 55 Severe

120

56 8.4 195 120 54 Severe

120

Specification

RRP 054 Studs: 146mm Cormet C Stud (CS146/B)*at 600mm centres


Insulation: 25mm glass mineral wooldensity min. 16 kg/m3

57 8.4 195 120 58 Severe

120

* B gauge studs 0.70mm thickness must be used in these systems





P A R T I T I O N S

75

3

Performance tables

RSP 003

RSP 004

RSP 002

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de


Facings: one layer 12.5mm LafargedBcheck wallboard both sides



Facings: two layers 12.5mm LafargedBcheck wallboard both sides


Facings: two layers 15mm LafargedBcheck wallboard both sides

Table 3.3Cormet dBcheck Partitions, non-loadbearing

22 2.5 75 30 44 Medium

30

43 3.4 100 60 46 Severe

60

51 3.7 110 60 48 Severe

60

System reference

RSP 006

RSP 027 Studs: 50mm Cormet C Stud (CS50/R) at600mm centres





44 3.4 100 60 54 Severe

60

22 3.6 95 30 40 Medium

30

RSP 007





Facings: one layer 15mm Lafarge dBcheckwallboard both sides

23 3.6 95 30 47 Medium

30

26 3.8 100 30 42 Heavy

30

Specification






26 2.8 80 30 40 Heavy

30

76

P A R T I T I O N S


Performance tables




27 3.8 100 30 48 Heavy

30

System reference

RSP 013







44 4.6 120 60 56 Severe

60

54 4.9 130 90 57 Severe

60

Table 3.3 (ctd)Cormet dBcheck Partitions, non-loadbearing

Specification Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss (m

m)

Max

imum

hei

ght

(m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de




ASP 006 Studs: 70mm wide Omega Acoustic Stud(AS70/R) at 600mm centres


22 3.6 95 30 42 Medium

30




44 4.6 120 60 58 Severe

60




54 4.9 130 90 59 Severe

60


P A R T I T I O N S

77

3

Performance tables




55 7.9 205 90 57 Severe

60

RSP 021 Studs: two 50mm Cormet C Studs (CS50/R)at 600mm centres, braced horizontallywith Cormet V Brace at max. 1.5m centres

Facings: inner layer 19mm Lafarge Plankfixed with long edges horizontally, outerlayer 12.5mm dBcheck wallboard bothsides


55 4.2 200 90 64 Severe

60 -10 Ctr

RSP 038 Studs: two 50mm Cormet C Studs (CS50/R)at 600mm centres, braced horizontallywith Cormet V Brace at max. 1.5m centres



55 4.2 200 90 63 Severe

60 -7 Ctr

System reference


Specification Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss (m

m)

Max

imum

hei

ght

(m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de

RSP 023

RSP 022 Studs: two 90mm Cormet C Studs (CS90/W)at 600mm centres, braced at every 3m withCormet V Brace and Cormet PrimaryChannel MFCP44 extension


Insulation: 100mm glass mineral wooldensity 10.5 kg/m3

Studs: two 90mm Cormet C Studs(CS90/W) at 600mm centres, braced atevery 3m with Cormet V Brace and CormetPrimary Channel MFCP44 extension


Insulation: 100mm glass mineral wooldensity 10.5 kg/m3

47 8.5 295 60 67 Severe

60 -9 Ctr

55 9.5 300 90 69 Severe

60 -9 Ctr




78

P A R T I T I O N S


Performance tables

System reference

RSP 033

RSP 037

RSP 025 Studs: two 90mm Cormet C Studs (CS90/W)at 600mm centres, braced at every 3m withCormet V Brace and Cormet PrimaryChannel MFCP44 extension

Facings: inner layer 19mm Lafarge Plankfixed with long edges horizontally, middleand outer layers 12.5mm Lafarge dBcheckwallboard both sides

Insulation: two 100mm glass mineralwool quilts density 10.5 kg/m3

Studs: two 90mm Cormet C Studs (CS90/W)at 600mm centres, in UT92/W tracks set122mm apart. Braced at 3m centres withCormet V Brace and Cormet PrimaryChannel MFCP44 extension

Facings: inner layer 19mm Lafarge Plank,middle and outer layers 15mm LafargedBcheck wallboard both sides

Insulation: two 150mm glass mineralwool quilts density 10 kg/m3

Studs: two 90mm Cormet C Studs (CS90/W)at 600mm centres, in UT92/W tracks set125mm apart. Braced at 3m centres withCormet V Brace and Cormet PrimaryChannel MFCP44 extension

Facings: three layers of 15mm LafargedBcheck wallboard both sides

Insulation: two 100mm glass mineralwool quilts density 10 kg/m3

79 10.5 400 90 72 Severe

90 -7 Ctr

85 12 400 120 73 Severe

90 -7 Ctr

82 12 400 120 74 Severe

90 -7 Ctr


Specification Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss (m

m)

Max

imum

hei

ght

(m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de





P A R T I T I O N S

79

3

Performance tables

RSP 019 Studs: 60mm wide Cormet I Studs (IS60/B)at 300mm centres, staggered in 72mmtrack with ISC10 clips



53 3.9 130 90 58 Severe

60

RSP 085 Studs: 60mm wide Cormet I Studs (IS60/B)at 300mm centres, staggered in 72mmtrack with ISC10 clips



53 3.9 130 90 59 Severe

60

System reference Specification Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss (m

m)

Max

imum

hei

ght

(m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de





Studs: 70mm wide Cormet C Stud (CS70/R)at 600mm centres

Facings: two layers 15mm LafargedBcheck wallboard both sides and withCormet Resilient Bar (RBD3000) to oneside at 600mm vertical centres


RSP 157 52 3.0 145 90 62 Severe

60 -9 Ctr




RSP 159 52 5.4 220 90 63 Severe

60 -8 Ctr

Studs: 90mm wide Cormet C Stud (CS90/R)at 600mm centres



RSP 158 52 3.6 165 90 62 Severe

60 -9 Ctr

80

P A R T I T I O N S


Performance tables

RFP 016

RFP 013

RFP 010

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de


Facings: two layers 12.5mm LafargeFirecheck wallboard both sides





Facings: one layer 15mm LafargeFirecheck wallboard both sides


Table 3.4Cormet Firecheck Partitions, non-loadbearing – 50mm C Studs

41 3.6 100 120 45 Severe

90

43 3.6 100 120 52 Severe

90

26 2.8 80 60 44 Heavy

60


RFP 112

RFP 111 Studs: two 50mm Cormet C Stud (CS50/R)at 600mm centres set 45mm apart

Facings: inner layer 15mm LafargeFirecheck wallboard, outer layer 15mmLafarge Firecheck wallboard or Megadecowallboard

Core: three layers 15mm Lafarge Firecheckwallboard

Studs: two 50mm Cormet C Stud (CS50/R)at 600mm centres set 45mm apart

Facings: inner layer 15mm LafargeFirecheck wallboard, outer layer 15mmLafarge Firecheck wallboard or Megadecowallboard

Insulation: 25mm glass mineral wool quiltin each cavity density 16 kg/m3

Core: three layers 15mm Lafarge Firecheckwallboard

86 6.0 205 240 60 Severe

240 -10 Ctr

88 6.0 205 240 65 Severe

240 -10 Ctr





P A R T I T I O N S

81

3

Performance tables

RFP 046

RFP 049

Studs: 70mm Cormet C Stud (CS70/R)600mm centres

Facings: two layers 15mm LafargeFirecheck wallboard both sides



Facings: one layer 12.5mm LafargeFirecheck wallboard both sides


41 4.9 130 120 57 Severe

120

22 3.6 95 60 45 Medium

60

System reference

RFP 054

RFP 050 Studs: 70mm Cormet C Stud (CS70/R) at600mm centres





42 4.6 120 120 53 Severe

120

41 4.6 120 120 48 Severe

120

RFP 044






25 3.8 100 60 39 Heavy

30

26 3.8 100 60 47 Heavy

60



40 4.9 130 120 50 Severe

120

Table 3.4 (ctd)Cormet Firecheck Partitions, non-loadbearing– 70mm C Studs

Specification Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss (m

m)

Max

imum

hei

ght

(m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de


Facings: inner layer 15mm LafargeFirecheck wallboard, outer layer 15mmLafarge Firecheck wallboard or Megadecoand with Cormet Resilient Bar (RBD3000)to one side at 600mm vertical centres


50 3.0 140 120 62 Severe

120 -9 Ctr




82

P A R T I T I O N S


Performance tables

RFP 127

RFP 128


Facings: one layer 12.5mm LafargeFirecheck wallboard both sides



Facings: one layer 15mm LafargeFirecheck wallboard on both sides


Facings: one layer 15mm LafargeFirecheck wallboard on both sides


22 3.9 115 60 45 Medium

30

26 4.4 120 60 40 Heavy

60

27 4.4 120 60 47 Heavy

60

System reference

RFP 135


Facings: inner layer 12.5mm LafargeFirecheck wallboard, outer layer 12.5mmLafarge Firecheck wallboard on both sides


Facings: inner layer 12.5mm LafargeFirecheck wallboard, outer layer 12.5mmLafarge Firecheck wallboard on both sides


42 5.2 140 120 49 Severe

120

43 5.2 140 120 54 Severe

120

Table 3.4 (ctd)Cormet Firecheck Partitions , non-loadbearing– 90mm C Studs

Specification Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss (m

m)

Max

imum

hei

ght

(m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de




ACP 050 Studs: 70mm wide Omega Acoustic Stud(AS70/R) at 600mm centres

Facings: inner layer 12.5mm LafargeFirecheck wallboard, outer layer 12.5mmLafarge Firecheck wallboard or Megadecowallboard both sides


43 4.6 120 120 54 Severe

90

ACP 054 Studs: 70mm wide Omega Acoustic Stud(AS70/R) at 600mm centres


41 4.6 120 120 50 Severe

90


P A R T I T I O N S

83

3

Performance tables

RFP 063

RFP 068









26 6.5 175 60 42 Heavy

60

27 6.5 175 60 48 Heavy

60

43 7.6 205 120 57 Severe

120

System reference

RFP 076






42 7.6 195 120 50 Severe

120

45 7.6 195 120 56 Severe

120

Table 3.4 (ctd)Cormet Firecheck Partitions, non-loadbearing– 146mm C Studs

Specification Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss (m

m)

Max

imum

hei

ght

(m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de




84

P A R T I T I O N S


Performance tables

REP 002

REP 005

REP 001

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de


Facings: one layer 12.5mm Lafarge Echeckwallboard both sides





Facings: two layers 12.5mm LafargeEcheck wallboard both sides

Table 3.5Cormet Echeck Partitions, non-loadbearing

19 2.5 75 30 34 Medium

30

20 2.5 75 30 40 Medium

30

37 3.4 100 60 43 Severe

60

System reference

REP 041

REP 006 Studs: 50mm Cormet C Stud (CS50/R) at600mm centres





38 3.4 100 60 49 Severe

60

19 3.6 95 30 36 Medium

30




20 3.6 95 30 42 Medium

30

Specification





P A R T I T I O N S

85

Performance tables

REP 045

REP 046






37 4.6 120 60 46 Severe

60

38 4.6 120 60 50 Severe

60

System reference

REP 067





Insulation: 25mm glass mineral wooldensity 16k g/m3

38 7.6 195 60 48 Severe

60

39 7.6 195 60 52 Severe

60

Table 3.5 (ctd)Cormet Echeck Partitions, non-loadbearing

Specification Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss (m

m)

Max

imum

hei

ght

(m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de





Facings: inner layer 19mm Lafarge Plankfixed with long edges horizontally to studside and long edges vertically to resilientbar side. Outer layer 12.5mm LafargeEcheck wallboard. Cormet Resilient Bar(RBD3000) fixed to one side at 600mmvertical centres


48 3.0 150 90 63 Severe

60 -9 Ctr

86

P A R T I T I O N S


Performance tables

REP 091 Studs: two 50mm Cormet C Studs (CS50/R)at 600mm centres, set 40mm apart, bracedhorizontally with Cormet V Brace at max.1.5m centres



39 4.2 195 60 54 Severe

60

REP 094

REP 093 Studs: two 50mm Cormet C Studs (CS50/R)at 600mm centres, set 40mm apart, bracedhorizontally with Cormet V Brace at max.1.5m centres

Facings: inner layer 19mm Lafarge Plankfixed with long edges horizontally, outerlayer 12.5mm Lafarge Echeck wallboardboth sides


Studs: two 70mm Cormet C Studs (CS70/R)at 600mm centres, set 40mm apart, bracedhorizontally with Cormet V Brace at max.1.5m centres



48 4.2 200 90 60 Severe

60 -11 Ctr

39 4.8 230 60 55 Severe

60

Table 3.5 (ctd)Cormet Echeck Partitions, non-loadbearing

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss (m

m)

Max

imum

hei

ght

(m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de






P A R T I T I O N S

87

3

Performance tables

RCP 002

RCP 005

RCP 001

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)BS

523

4 G

rade


Facings: one layer 12.5mm LafargeStandard or Predeco wallboard both sides





Facings: two layers 12.5mm LafargeStandard or Predeco wallboard both sides

Table 3.6Cormet Standard Wallboard Partitions, non-loadbearing

19 2.5 75 0 34 Medium

0

20 2.5 75 0 39 Medium

0

37 3.4 100 30 42 Severe

30

System reference

RCP 006 Studs: 50mm Cormet C Stud (CS50/R) at600mm centres



38 3.4 100 30 49 Severe

30

RCP 042



Studs: 70mm Cormet C Stud (CS70/R) at600 mm centres



19 3.6 95 0 36 Medium

0

20 3.6 95 0 42 Medium

0

Specification



The Deco system is not suitable for plaster finishing. Refer to Section 7 for finishing details.


88

P A R T I T I O N S


Performance tables

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de

Table 3.6 (ctd)Cormet Standard Wallboard Partitions, non-loadbearing

System reference




38 4.6 120 60 49 Severe

30



37 4.6 120 60 46 Severe

30

Specification



20 3.9 115 0 38 Medium

0


Facings: inner layer 19mm Lafarge Plankfixed with long edges horizontally to studside and long edges vertically to resilientbar side. Outer layer 12.5mm LafargeStandard or Predeco wallboard. CormetResilient Bar (RBD3000) fixed to one sideat 600mm vertical centres


48 3 150 90 63 Severe

60 -10 Ctr





Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de

Table 3.6 (ctd)Cormet Standard Wallboard Partitions, non-loadbearing


P A R T I T I O N S

89

3

Performance tables

RCP 067

RCP 068







Facings: inner layer 15mm LafargeStandard wallboard, outer layer 15mmLafarge Standard or Predeco wall boardboth sides


38 7.6 195 60 48 Severe

30

39 7.6 195 60 52 Severe

30

47 8.2 205 90 53 Severe

60

RCP 093 Studs: two 50mm Cormet C Studs (CS50/R)at 600mm centres, set 40mm apart, bracedat max 1.5m centres with Cormet V Brace

Facings: inner layer 19mm Lafarge Plankfixed with long edges horizontally, outerlayer 12.5mm Lafarge Standard or Predecowallboard both sides


48 4.2 205 60 60 Severe

60 -11 Ctr

RCP 094

RCP 091 Studs: two 50mm Cormet C Studs (CS50/R)at 600mm centres, set 40mm apart, bracedat max 1.5m centres with Cormet V Brace



Studs: two 70mm Cormet C Studs (CS70/R)at 600mm centres, set 40mm apart, bracedat max 1.5m centres with Cormet V Brace



39 4.2 190 60 54 Severe

30

39 4.8 230 60 55 Severe

30






Soun

d in

sula

tion

(Rw

dB)

BS 5

234

Gra

de

90

P A R T I T I O N S


Performance tables

AHSP 002

AHSP 003

AHSP 001

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Studs: 44mm Acoustic Homespan C Stud(AHS44/R) at 450mm centres

Facings: one layer 15mm Lafarge AcousticHomespan wallboard both sides






Table 3.7Cormet Acoustic Homespan Partitions,non-loadbearing

28 2.7 75 30 40 Heavy

30

29 2.7 75 30 43 Heavy

30

28 2.8 80 30 40 Heavy

30

System reference

AHSP 004 Studs: 50mm Acoustic Homespan C Stud(AHS50/R) at 450mm centres

Facings: one layer 15mm Lafarge AcousticHomespan wall board both sides


29 2.8 80 30 43 Heavy

30

Specification Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4





P A R T I T I O N S

91

3

Performance tables

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)BS

523

4 G

rade

Table 3.8Cormet Omega Acoustic Stud Partitions, non-loadbearing


ASP 006 Studs: 70mm Omega Acoustic Stud(AS70/R) at 600mm centres


22 3.6 95 30 42 Medium

30

AMP 003 Studs: 70mm Omega Acoustic Stud(AS70/R) at 600mm centres



30 3.8 100 60 51 Severe

60




44 4.6 120 60 58 Severe

60




54 4.9 130 90 59 Severe

60

ACP 054 Studs: 70mm Omega Acoustic Stud(AS70/R) at 600mm centres


41 4.6 120 120 50 Severe

90




92

P A R T I T I O N S


Performance tables

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)BS

523

4 G

rade

Table 3.8 (ctd)Cormet Omega Acoustic Stud Partitions, non-loadbearing


ACP 050 Studs: 70mm Omega Acoustic Stud(AS70/R) at 600mm centres



43 4.6 120 120 54 Severe

90


Facings: inner layer 15mm LafargedBcheck wallboard, outer layer 15mmLafarge Firecheck wallboard or Megadecowallboard both sides


55 5.0 150 90 60 Severe

90 -7 Ctr



Insulation: 75mm glass mineral woolinsulation density 10.5 kg/m3

31 4.2 120 60 52 Severe

60


Facings: inside layer 15mm LafargedBcheck wallboard between studs, outerlayer 15mm Lafarge Firecheck wallboard orMegadeco wallboard both sides


38 4.2 120 60 53 Severe

60





P A R T I T I O N S

93

3

Performance tables

ETP 003

ETP 002

ETP 001

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de

Studs: 38 x 63mm at 600mm centres






Facings: two layers 12.5mm LafargeEcheck wallboard to both sides

Table 3.9Lafarge Drywall Timber Stud Partitions,loadbearing

21 3.0 90 30 35 Medium

30

22 3.0 90 30 40 Medium

30

39 3.0 125 60 43 Severe

30

System reference

ETP 006

ETP 004 Studs: 47 x 75mm at 600mm centres

Facings: two layers 12.5mm LafargeEcheck wallboard to both sides



Facings: one layer 12.5mm Lafarge Echeckto both sides

40 3.0 125 60 46 Severe

30

21 3.6 115 30 37 Medium

30

RTP 152 Studs: 38 x 89mm at 600mm centres

Facings: two layers 15mm LafargedBcheck wallboard one side, other sidetwo layers 15mm Lafarge dBcheckwallboard fixed to Cormet Resilient Bar(RBD3000) at 600mm vertical centres


55 3.6 165 60 59 Severe

60

Specification





Facings: one layer 12.5mm LafargeFirecheck to both sides

21 2.7 100 60 36 Medium

30

94

P A R T I T I O N S


Performance tables

Gra

de t

o BS

523

4

RTP 022

RTP 031

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de


Facings: two layers 12.5mm LafargeStandard wallboard both sides



Facings: two layers 12.5 Lafarge Standardwallboard on both sides

Table 3.9 (ctd)Lafarge Drywall Timber Stud Partitions,loadbearing

38 3 113 60 46 Severe

30

38 3 113 30 39 Severe

30



Facings: one layer 12.5mm LafargeStandard wallboard both sides

21 3.0 90 0 35 Medium

0




22 3.0 90 0 40 Medium

0



39 3.0 125 30 43 Severe

30




60 3.0 125 30 46 Severe

30



21 2.7 114 0 37 Medium

0





P A R T I T I O N S

95

3

Performance tables

RFL 050*

RFL 011*

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (R

wdB

)

(Ctr

if

app

licab

le)

BS 5

234

Gra

de

Studs: pairs of studs 38 x 89mm at 600mmcentres forming two separate frames set50mm apart, braced at mid-height

Facings: both sides: inner layer 19mmLafarge Plank with long edges horizontal,outer layer 12.5mm Lafarge Firecheckwallboard

Insulation: 2 x 50mm glass mineral wooldensity 16 kg/m3

Studs: pairs of studs 38 x 89mm at 600mmcentres forming two separate frames set50mm apart, braced at mid-height

Facings: both sides 15mm LafargeFirecheck wallboard with long edgeshorizontal

Insulation: 2 x 50mm glass mineral wooldensity 16 kg/m3

Table 3.10Lafarge Drywall Timber Stud PartitionHigh Performance, loadbearing

55 3.6 295 60 65 Severe

60 -12 Ctr

56 3.6 290 60 66 Severe

60 -9 Ctr


* These details are deemed-to-satisfy the Robust Detail criteria




E-WT-1(Robust Detail)

E-WT-2(Robust Detail)

Studs: pairs of studs 38 x 89mm at 600mmcentres forming two separate frames set50mm apart, each with 40mm x 3mmmaximum ties at 1200mm centreshorizontally, one tie per storey heightvertically

Facings: two layers each side - inner layer19mm Lafarge Plank with long edgeshorizontal, outer layer 12.5mm Standardwallboard (gives total minimum weight 22 kg/m2 each side)

Insulation: one layer 60mm rock mineralwool batts density 33-60 kg/m3 betweenstuds. Alternatively, use two layers glassmineral wool quilt density 10 kg/m3

55 3.6 293 60 Robust SevereDetail

30 Solution

Studs: pairs of studs 38 x 89mm at 600mmcentres forming two separate frames set50mm apart, with 40mm x 3mm maximumties at 1200mm centres horizontally, onetie per storey height vertical, and 9mmsheathing

Facings: two layers each side - inner layer19mm Lafarge Plank with long edgeshorizontal, outer layer 12.5mm LafargeStandard wallboard (gives total minimumweight 22 kg/m2 each side)

Insulation: one layer 60mm rock mineralwool batts density 33-60 kg/m3 betweenstuds. Alternatively, use two layers glassmineral wool quilt density 10 kg/m3

60 3.6 301 60 Robust SevereDetail

30 Solution

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

SEN

1364

Soun

d in

sula

tion

(Rw

dB)

96

P A R T I T I O N S


Performance tables

E-WM-3(Robust Detail)



Blocks: double leaf 100mm dense aggregate concretedensity 1850-2300 kg/m3, 75mm cavity, tied with ‘Tie type A’ (as Approved Document E)

Render: 8mm cement:sand render

Lining: one layer 12.5mm gypsum based board (nominal8 kg/m2) on dabs

Blocks: double leaf 100mm cellular Besblock ‘StarPerformer’ dense aggregate: core concrete density 1995 kg/m3, block concrete density 1528 kg/m3, 75mmcavity, tied with ‘Tie type A’ (as Approved Document E)



Blocks: double leaf Aircrete concrete density 600-800 kg/m3, 75mm cavity, tied with ‘Tie type A’ (as Approved Document E)



5.2 315 240 RobustDetail

240 Solution


240 Solution


240 Solution



Blocks: double leaf 100mm dense aggregate concretedensity 1850-2300 kg/m3, 75mm cavity, tied with ‘Tie type A’ (as Approved Document E)

Finish: 13mm plaster or cement:sand render with plasterskim (min 10 kg/m2) both sides


240 Solution


Blocks: double leaf 100mm lightweight aggregateconcrete density 1350-1600 kg/m3, 75mm cavity, tied with ‘Tie type A’ (as Approved Document E)

Finish: 13mm plaster or cement:sand render with plasterskim (min 10 kg/m2) both sides


240 Solution

Table 3.11Robust Detail Masonry Systems


Blocks: double leaf 100mm lightweight aggregateconcrete density 1350-1600 kg/m3, 75mm cavity, tied with ‘Tie type A’ (as Approved Document E)




240 Solution


P A R T I T I O N S

97

3

Performance tables

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

SEN

1365

Soun

d in

sula

tion

(Rw

dB)

(Ctr

if

app

licab

le)

Gra

de t

o BS

523

4


Table 3.11Separating Walls – Structural Steel Systems

Studs: two 70mm structural steel studs at 600mmcentres, by other manufacturers

Facings: two layers each side - inner layer 15mmLafarge Standard wallboard, outer layer 15mm LafargeFirecheck wallboard

Insulation: 50mm glass mineral wool density 24 kg/m3

Studs: two 100mm structural steel studs at 600mmcentres, by other manufacturers

Facings: two layers each side - 15mm Lafarge dBcheckwallboard

Insulation: two layers 75mm glass mineral wool density24 kg/m3 in each stud cavity

Studs: 150mm structural steel studs at 600mm centres,by other manufacturersFacings: two layers each side - inner layer 15mm LafargedBcheck wallboard, outer layer 15mm Lafarge Firecheckwallboard, and Cormet Resilient Bar (RBD3000) at400mm vertical centresInsulation: 50mm glass mineral wool density 24 kg/m3

between studs

3.6** 250 60 65 Severe

60 -7 Ctr

RLP 03*

RLP 14

4.0** 310 90 66 Severe

60 -9 Ctr

4.5** 245 60 64 Severe

60 -7 Ctr

Studs: two 100mm structural steel studs at 600mmcentres, by other manufacturersFacings: two layers each side - inner layer 15mmLafarge dBcheck wallboard, outer layer 12.5mm LafargedBcheck wallboard (gives total minimum weight 22 kg/m2 each side)Insulation: one layer 50mm glass mineral wool density24 kg/m3 between studs. Alternatively, use 2 layers glassmineral wool quilt density 10 kg/m3, minimum 25mmthick per layer

E-WS-1(Robust Detail)

4.5** 310 60 Robust SevereDetail

60 Solution

E-WS-1: Alternative(Robust Detail)

Studs: two 100mm structural steel studs at 600mmcentres, by other manufacturersFacings: two layers each side - inner layer 19mmLafarge Plank with long edges horizontal, outer layer12.5mm Lafarge Firecheck wallboard (gives totalminimum weight 22 kg/m2 each side)Insulation: one layer 50mm glass mineral wool density24 kg/m3 between studs. Alternatively, use 2 layers glassmineral wool quilt density 10 kg/m3, minimum 25mmthick per layer

4.5** 315 60 Robust SevereDetail

60 Solution

RLP 01

Note

* These details are deemed-to-satisfy the Robust Detail criteria

** For the maximum height values shown, lateral restraint to the steel framing is assumed. Please refer to structural engineer as these are for guidance only.



98

P A R T I T I O N S


Case study

Cormet Twin Wall Partitions aredesigned for installations requiringenhanced fire, sound or impactresistance and for use in creatingexceptionally wide or high partitions.

Ideal for fast-track projects, they offermarkedly better sound performance/thickness ratios than can be achievedusing blockwork.

This has made them popular forbuildings ranging from manufacturingfacilities, multiplex cinemas and multi-occupancy domestic properties tohospitals.


P A R T I T I O N SCORMET TWIN FRAME SYSTEMS

99

3

100



Cormet Staggered I Studsystem (system RSP 019 shown)

Cormet Twin frame system

72mm Cormet U Track withfixing at 600mm centres.

60mm Cormet I Studs at 300mm centres,staggered in track with Cormet ISC10 Clips

Timber sole plate ifrequired on uneven floors

Pairs of Cormet CStuds braced at

maximum 1500mmcentres using Cormet

V-Brace and extendedusing MFCP44

Primary Channel asrequired

Mineral woolsuspended incavity as required

Cormet U Track

52mm Cormet U Tracks

Cormet Twin Frame SystemsCormet non-load bearing Twin WallSystems constructed fromplasterboard facings on metal studshave considerable advantagescompared with traditional heavymasonry construction.

They are:

• lightweight

• quick to construct

• cost effective

• compact

• able to achieve high levels of fireresistance and acoustic insulation.

There are two types of Cormetsystems:

• staggered stud systems in singletrack

• twin frame systems constructedusing two separate metal frames,set a minimum of 40mm apart andbraced together.

Performance

The selection of system, and thetype, number and thickness of boardlayers will depend on the partitionheight and the performancerequired for fire resistance andsound insulation. Refer to theperformance table 3.1, 3.3, 3.5 and3.6.

Lafarge plasterboards are defined as Class 0 in accordance with NationalBuilding Regulations 1991 ApprovedDocuments B1/2/3/4/5 Fire Safety andBuilding Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1997 and Euroclass A2.The gypsum core is classified as non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1. Lafarge jointingcompounds, textures and bondingcompounds and Cormet metalsystems are non-combustible whentested in accordance with BS 476:Part 4: 1970 and Euroclass A1.

Boarding

On partitions over single boardheight, stagger layers by a minimumof 300mm.

Stagger layers on each side ofpartition with previous layer.

Introduction

Lafarge IntumescentAcoustic Sealant




101

3

Staggered Stud Clip ISC10

3.12 Components for Cormet High PerformancePartitions

Component Lafarge Dimensionscolour code code (mm)metal thickness (mm)

I Stud blue gauge 0.5mm IS60/B 40 x 60

C Stud CS50/R 36 x 50 x 34

CS70/R 36 x 70 x 34

CS90/W 36 x 90 x 34

Staggered Stud Clip ISC10 12 x 27.5 x 38

V Brace VBRACE 100 x 42

Lafarge Resilient Tape RAFT50 12 x 50

6 6

3734

40

60

50, 70 or90

C Stud CS50/RC Stud CS70/RC Stud CS90/W

I Stud IS60/B

Components

Components

Components used are as on pages123-124, with additionalcomponents as shown on the right.

Colour coding is used to identifymetal thickness:

Red (R) 0.5mm

Blue (B) 0.7mm

White (W) 0.9mm

Maximum heights shown in tables3.1, 3.3. 3.5 and 3.6 refer to 0.50mmthick studs (red gauge). If 0.70mmthick studs (blue gauge) are usedthen the maximum heights can beincreased by 0.30m for single layersystems 0.60m for double layer.

All framing components aremanufactured to BS 7364: 1990specification for galvanised steelstuds and channels for stud andsheet partitions and linings usingscrew fixed gypsum wallboards.

38

27.5

12

3

14

Cormet V Brace VBRACE

100

42

Components

102



Cormet U Tracks

50mm rock mineral wool batts

Two layers 15mm Lafarge dBcheckwallboard (minimum total weight22 kg/m2 each side)

12.5mm Lafarge Standard wallboard(minimum weight 8 kg/m2)

Lafarge Direct Bond lining system

Overheight partitions Partitions with double layer boardingSuspension of mineral wool

Skirting screw-fixedto Cormet C Studs

Cormet C Studs

Cormet Twin Wall Solutions

All wallboard perimeters sealedwith Lafarge IntumescentAcoustic Sealant, to ensuresystem performance

Cormet Flat Strapbetween boards athorizontal joints inouter wallboardlayer

Cormet InsulationHold Strip tosupport insulationat 1200mmcentres vertically

All joints in adjacentlayers to be staggered

All joints tapedand filled

Cormet Drylining system

CormetV Brace



103

3

Ceiling and skirting detail

Fire rating up to 60 minutes, maximum deflection 10mm

Typical deflection head detail

Fire rating up to 60 minutes, maximum deflection 25mm

Typical door jamb detailCorner detail

Junction with external concrete wall T junction (plan)

12.5mm LafargeFirecheck wallboard


Wallboards andinsulation as specified

Studs as specifiedcut short by10mm


Lafarge Acoustic Tape

Cormet U Trackas specified


Packer of LafargeFirecheck asspecified

Cormet DeepFlange Track tosuit studs

Rockwool withCormet MetalAngle

Cormet Flat Strapbetween layers

Wallboards andinsulation asspecified

Wallboard as specified

Drylining system as specified

Lafarge Acoustic Tape

Cormet V Brace

Wallboard, studs andinsulation as specified


Wallboards andinsulation as specified

Cormet V Brace

Studs as specified


MIneral wool betweenend studs

LafargeIntumescentAcousticSealant

Cormet V Brace

Wallboard, studs andinsulation as specified

Studs as specified

Note on head packer:

Max deflection Packer required

8mm 1x12.5mm Firecheck*

10mm 1x15mm Firecheck*

15mm 1x19mm Plank

20mm 2x12.5mm Firecheck**


Notes:

* Firecheck can be substituted by Megadeco, Toughcheck or MR Firecheck

** Firecheck can be substituted by 25mm Firecheck Coreboard


104



Specification

Cormet Twin Wall Systems

Scope

Cormet Twin Wall partition usingtwin Cormet C Studs fitted intoCormet U Track at head and floorwhere superior fire and acousticperformance may be required.

Additional clauses

Add general clauses (see Section 8) ifrequired for:

• Expansion/movement joints

• Health and safety

• Storage of materials

• Site conditions and workmanship

NBS clauses

When using the NBS Specification,use clause K10 PLASTERBOARD DRYLININGS/PARTITIONS/CEILINGS.

The Lafarge Plasterboard websitecontains a full set of NBS clauses,completed for each LafargePlasterboard system. See:www.lafargeplasterboard.co.uk/nbssearch/index.asp

System reference (Insert Lafarge system reference from Performance Tables)Location ........................Client reference ........................PerformanceMaximum height ....................m

Fire rating ....................mins

Airborne insulation ....................RwdB

Thickness ....................mm

Weight ....................kg/m2

Grade to BS 5234: ...................

Horizontal jointsIf partition height exceeds board height, use Cormet Channel MFIX or CormetFixing Strap FS90/W in single boarded partitions or Cormet Fixing Strap FS50/Ror FS90/W in double boarded partitions.

Insulation(Specify insulation thickness and grade/density from the Performance Tables)

Acoustic mastic6mm bead of Lafarge Acoustic Sealant around perimeter of the framing.

StudsTwo Cormet C Studs, reference CS50/R, CS60/R, CS70/R, CS90/R, CS146/R,CS70/B, CS90/B, CS146/B, CS90/W, CS70/Y, CS90/Y or CS146/Y, width 50, 60, 70,90 or 146mm at max 600mm centres

BracingCormet Acoustic Brace (VBRACE) at centres as defined in performance tables.

Floor trackCormet U Track, reference UT52/R, UT62/R, UT72/R, UT92/R, UT148/R, width 52, 62, 72, 92, 148mm fixed at 600mm centres.

Head trackCormet U Track, reference UT52/R, UT62/R, UT72/R, UT92/R, UT148/R, width 52, 62, 72, 92, 148mm fixed at 600mm centres.

Floor/head track fixingsSpit Pulsa 700P nailing system for concrete or steel using fixings dependent onmaterial substrates at max 600mm centres

Standard concrete use Spit C6 Pins (Select from 20, 25, 30, 35, 40)mm, or

Hard concrete use Spit HC6 Pins (Select from 17, 20, 22, 27)mm, or

Steel use Spit SC6 Pins (Select from 15, 20)mm

Spit Hammer-In fixing for concrete at maximum 600mm centres

Type Spit Hit CL35 (Select from 30, 40, 50)mm

BoardingSingle or double layer of wallboard.

Inner layer (Specify wallboard from the Performance Tables)

Outer layer (Specify wallboard from the Performance Tables)

Board fixingsLafarge screws at 300mm centres

Type Drywall Self-tapping, or Toughcheck Self-tapping, or Checkpoint Self-tapping, or Megadeco Self-tapping.

Length, inner layer (Select from 25, 32, 38, 41, 44, 51, 57, 63, 67, 76)mm

Length, outer layer (Select from 25, 32, 38, 41, 44, 51, 57, 63, 67, 76)mm

FinishingLafarge Taping and jointing system, or

Lafarge Supreme Skim Plaster, or

Lafarge Predeco taping and jointing system

InstallationAll materials, unless otherwise indicated, shall be supplied by LafargePlasterboard Ltd. and shall be installed in accordance with their currentliterature and in accordance with BS 8212: 1995.

Given the vast selection of different types of substrate that are encounteredon-site, it is strongly recommended that adequate site tests be carried out toestablish a recommended load on fixings.

Notes:

Red text lists alternative productspecifications.

(Italic red text within bracketsgives advice on selecting theinformation needed).



105

3

Specification

Cormet Staggered I StudSystems

Scope

Cormet Staggered I Stud partitionusing Cormet I Studs in a staggeredpattern fitted into a single Cormet UTrack at head and floor. Used whereacoustic performance may berequired.

Additional clauses






NBS clauses



System reference (Insert Lafarge system reference from Performance Tables)

Location ........................Client reference ........................PerformanceMaximum height ....................m

Fire rating ....................mins


Thickness ....................mm

Weight ....................kg/m2




StudsCormet I Studs, reference CS70/R and IS60/B at max 300mm centres

BracingCormet Staggered Stud Clip, reference ISC10.

Floor trackCormet U Track, reference UT72/R at 600mm centres.

Head trackCormet U Track, reference UT72/R at 600mm centres.



















Notes:



106

P A R T I T I O N S


Case study

Cormet Resilient Bar provides a degreeof isolation between the wallboardsurface and the supporting structure,thus improving the acousticperformance of the partition.


P A R T I T I O N SCORMET RESILIENT BAR SYSTEMS

107

3

108



Cormet Resilient BarSystemsPartitions using the Cormet ResilientBar are constructed in the usual way,but the Cormet Resilient Bars arefixed to one side of the studpartition and faced with wallboard.

The benefit of Cormet Resilient Baris that it improves the acousticperformance of the partition withlittle increase in partition width orweight.

Performance

The selection of system, and thetype, number and thickness of boardlayers will depend on the partitionheight and the performancerequired for fire resistance andsound insulation. Refer to theperformance tables 3.3, 3.4, 3.5, 3.6and 3.9.

Lafarge plasterboards are defined as Class 0 in accordance with NationalBuilding Regulations 1991 ApprovedDocuments B1/2/3/4/5 Fire Safety andBuilding Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1997 and Euroclass A2.The gypsum core is classified as non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1. Lafarge jointingcompounds, textures and bondingcompounds and Cormet metalsystems are non-combustible whentested in accordance with BS 476:Part 4: 1970 and Euroclass A1.

Introduction

Single frame system with Resilient Bar

Minimum 50mm glassmineral woolsuspended on CormetInsulation Hold Strip

Cormet Resilient Barat 600mm centresvertically

Cormet U-Track

17

45

6

19

Cormet Resilient Bar RBD3000



109

3

System reference RCP 56 (without Resilient Bar) RwdB 55 System reference RCP 55 (with Cormet Resilient Bar) RwdB 63

Note: superior performance with Cormet Resilient Bar

100125

160200

250315

400500

630800

10001250

16002000

25003150

40005000

20

30

40

50

60

70

80

90

100

Frequency (Hz)

Sou

nd

Red

uct

ion

Ind

ex R

(dB

)

RCP 56 BS EN ISO 717-1 Curve

100125

160200

250315

400500

630800

10001250

16002000

25003150

40005000

20

30

40

50

60

70

80

90

100

Frequency (Hz)

Sou

nd

Red

uct

ion

Ind

ex R

(dB

)

RCP 55 BS EN ISO 717-1 Curve

Cormet Resilient Bar

Where the Cormet Resilient Bar is tobe fixed to timber or metal studsthe following centres apply.

For single layer boarding fix CormetResilient Bar at 400mm centres.

For double layer board fix CormetResilient Bar at 600mm centres.

When fixing the Cormet ResilientBars, remember that the top CormetResilient Bar is fixed in the invertedposition, 50mm down from thesoffit. The final Cormet Resilient Barshould be installed no more than50mm from the floor. The remainingCormet Resilient Bars are installedat vertical centres to suit boarding,ie 600mm for double layer and400mm for single layer.

Table 3.13 Recommended screwlengths for fixing plasterboardto Cormet Resilient Bars

Plasterboard thickness Screw length(mm) (mm)

12.5 25

15.0 25

19.0 32

12.5 + 12.5 38

19.0 + 12.5 44

15.0 + 15.0 44

Screw fix the Cormet Resilient Barsto the Cormet studs using 25mmDrywall Self Tapping Screws.

Screw fix the wallboard to theCormet Resilient Bar only, ensuringthe screw does not touch the metalsubstrate.

For screw lengths for fixingplasterboard to Cormet ResilientBars see Table 3.13.

For fixing Cormet Resilient Bar totimber studs use 38mm Lafarge HighThread Screws.

Comparison of systems with and without Cormet Resilient Bar

Studs: 70mm Cormet C Stud (CS70/R) at 600mm centres

Facings: inner layer 19mm Lafarge Plank fixed with long edges horizontally

Facings: outer layer 12.5mm Lafarge Standard wallboard each side

Insulation: 50mm glass mineral wool density 16 kg/m3

110



Cormet Resilient Bar Solutions


Cormet Flat Strapbetween boards athorizontal joints inouter wallboardlayer


All joints in adjacentlayers to be staggered

All jointstapedand filled

Top Cormet Resilient Bar invertedto ensure fixing at 50mmmaximum from soffit

Cormet Drylining system

All wallboard perimeterssealed with LafargeIntumescent AcousticSealant to ensure systemperformance

Wallboardsscrewed toCormetResilient Bars

Bottom CormetResilient Barprovides fixing at50mm maximumfrom floor

Lafarge Direct Bond lining system

Cormet Resilient Bar spaced at600mm vertical centres and screwfixed to Cormet C Studs

See pages 83 to 87 for the range ofCormet Resilient Bar Partitions andtheir performance

Note: A baffle may berequired to maintainacoustic and fireperformance – seepages 140-141



111

3

Cormet U Track

Cormet InsulationHold Strip

Cormet C Studs

CormetResilient Bar

Cormet ResilientBar top railinverted

Cormet U Track

Single frame system with Cormet Resilient Bar – floor and ceiling details

50mm minimumglass mineral wooldensity 16kg/m3

6mm bead of LafargeIntumescent AcousticSealant aroundperimeter

Wallboard asspecified

Void filled withglass mineral

wool

High performance wall T junction


50mm glass mineralwool

Room 1

Room 2

Corridor

High performance wall head junction

Lafarge Resilient Tape Ref RAFT50Lafarge IntumescentAcoustic Sealant

CormetResilient Bar

50mm minimum glassmineral wool density16kg/m3

Void filled withmineral wool

Wallboard andstud asspecified

Junction with masonry wall

Wallboard setting out

Cut wallboard for dooropenings as shown toavoid joints runningparallel to framingstuds at sides of door

Door opening showndotted

Door opening detail


Lafarge Resilient Tape Ref RAFT50

Lafarge Intumescent Acoustic Sealant





LafargeIntumescent

Acoustic

112



Specification

Cormet Partition withResilient Bar

Scope

Partition constructed of Cormet CStuds with Cormet Resilient Bar toone side of partition to improveacoustic performance.

Additional clauses






NBS clauses




Fire rating ....................mins


Thickness ....................mm

Weight ....................kg/m2

Grade to BS 5234 ....................




StudsCormet C Studs, reference CS50/R, CS60/R, CS70/R, CS90/R, CS146/R, CS70/B,CS90/B, CS146/B, CS90/W, CS70/Y, CS90/Y or CS146/Y, width 50, 60, 70, 90 or146mm at max 600mm centres

Resilient BarInstall Cormet Resilient Bar RBD3000 to one side of studs at 600mm verticalcentres, using 25mm Lafarge Drywall Self Tapping Screws.

Floor trackCormet U Track, reference UT52/R, UT62/R, UT72/R, UT92/R, UT148/R, width 52, 62, 72, 92, 148mm fixed at 600mm centres.

Head trackCormet U Track, reference UT52/R, UT62/R, UT72/R, UT92/R, UT148/R, width 52, 62, 72, 92, 148mm fixed at 600mm centres.



















Notes:



Cormet Acoustic Homespan provides asingle solution for all modern domesticpartition requirements.

The sound absorbing C studs providemarkedly better performance thanrigid H studs and the system requiresno cross-noggings, contributing toreduced installation time.

Building Regulations now requireenhanced acoustic performance in arange of domestic partitions. CormetAcoustic Homespan uses acombination of high performancemetals, which minimise soundbridging, and dense core boardtechnology to provide 40 Rw dB soundperformance in a 75mm wide partitionwithout the need to install insulationwithin the system.

The Cormet Omega Acoustic Studhas a unique bulb design whichmeans less acoustic energy istransmitted through the stud and somore impact and airborne sound isabsorbed within the partition.Substituting the Cormet OmegaAcoustic Stud for a standard CormetC Stud increases the acousticperformance of the system withoutany loss in partition strength.


P A R T I T I O N SCORMET ACOUSTIC STUD SYSTEMS

113

3

114



Cormet Acoustic PartitionSystemsLafarge produce two acousticpartition systems:

• Cormet Acoustic Homespan

• Omega Acoustic Stud Partition

Cormet Acoustic Homespan

Cormet Acoustic Homespan is a75mm or 80mm nominal widthmetal stud partitioning system using44mm or 50mm metal CormetAcoustic Homespan C Studs set at450mm centres and one layer of15mm thick x 900mm wide AcousticHomespan wallboard fixed to eachside.

Cormet Acoustic HomespanPartition system is a lightweightdurable and high performancesystem:

• fast and easy to install

• cost effective against equivalentsize of timber stud

• eliminates nail popping and cracking

Performance

Cormet Acoustic Homespan C Studshave been specifically developed toachieve at least 40Rw dB soundrating without insulation in-linewith the latest Part E ApprovedDocument.

Cormet Acoustic Homespanwallboard has been designed toallow electrical cable installations tomeet N.H.B.C. guidelines and BS 7671requirements for electrical installation.

Lafarge Acoustic Homespanwallboard is defined as Class 0 inaccordance with National BuildingRegulations 1991 ApprovedDocuments B1/2/3/4/5 Fire Safety andBuilding Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1997 and Euroclass A2.The gypsum core is classified as non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1. Lafarge jointingcompounds, metal systems, texturesand bonding compounds are non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1.

Omega Acoustic Stud Partition

The Omega Acoustic Stud has aunique bulb design with engineeredtwin slots, which creates a resilientspring section. The spring sectionmeans less acoustic energy istransmitted through the stud and somore impact and airborne sound isabsorbed within the partition.

Introduction

Cormet Acoustic Homespan Partition System

Cormet Homespan U Track at floors and ceilings

Lafarge Intumescent Acoustic Sealant behind theperimeter of metal framing

15mm LafargeAcousticHomespanwallboardscrew fixed at300mm centreson studs and at200mm centresat perimeter

Cormet HomespanU Track Tracksnipped andfolded to formhead to dooropening

CormetAcousticHomespan C Studs at450mm centres

Cormet Acoustic Starter Stud usedin place of Cormet AcousticHomespan C Stud at door frames,wall abutments, corners and T junctions

Cormet Omega AcousticStud Partition

Omega AcousticStuds at 600mmcentres

Cormet U Track atfloors and ceilings

Wallboards asspecified

Lafarge IntumescentAcoustic Sealant behindthe perimeter of metalframing or at theperimeter of thewallboards

Lafarge IntumescentAcoustic Sealant atthe perimeter of thewallboards

Rubber grommet used to protect cable passing through service punch



115

3

Table 3.15 Acoustic Homespanwallboard

Homespan MR Homespan

Properties wallboard wallboard

Thickness 15mm 15mm

Width 900mm 900mm

Length 1800, 2400 2400mm

and 2700mm

Tapered edge Yes Yes

Square edge Yes No

36

44

34

50

36

38

6 6

6 6

Table 3.14 Cormet Acoustic componentsComponent Width Lengths Lafarge code

(mm) (mm)

Acoustic Homespan 44 2400 AHS44/R

C Stud 50 2400 AHS50/R

Acoustic Homespan 44 2400 CS44/R

Starter Stud 50 2400 CS50/R

Homespan 45 2400, 2700 UT45/R

U Track 52 3000 UT52/R

Homespan 45 2400 XDT45/R

U Track Deep Flange 52 3000 UDT52/B

Omega Acoustic Stud 70 2400, 2700, AS70/R

3000, 3600

90 3600, 3900, 4200 AS90/R


90 3000 UT92/R

Lafarge Intumescent 0.9 litres ACOUSTIC (intu)

Acoustic Sealant 0.38 litres ACO38 (intu)

C Stud AHS44/R

C Stud AHS50/R

Starter Stud CS44/R

45

70

26

45

30

52

U Track UT45/R

U Track UT52/R

U Track Deep FlangeXDT45/R

38

44

36

Starter Stud CS50/R

38

50

36

Components

Substituting the Omega AcousticStud for a standard Cormet C Studincreases the acoustic performanceof the system and improves theoverall RwdB figure with nosignificant loss of partition strength.For individual system performancesee Cormet Omega Stud partitionsin table 3.8.

System components

All metal components aremanufactured to BS 7364: 1990specification for galvanised steelstuds and channels for stud andsheet partitions and linings usingscrew fixed gypsum wallboard.

Flanges have deep knurlings foreasier screw fixing and plasterboardalignment.

Cormet Acoustic Homespan Studs and Tracks

Omega Acoustic Studs

34

6 6 6 6

3636 34

70 90 90

70

30

30

U Track UT72/R

U Track UT92/R

AS70/R AS90/R

116



Application details

Cormet Acoustic Homespan Omega Acoustic Partition


Cormet FixingChannel or CormetFlat Strap FS90/W athorizontal joints inouter wallboard layer


All joints to occuron centre ofCormet Studs

All jointstapedand filled

Cormet U Track

Cormet OmegaAcoustic Studs at600mm centres


15mm Lafarge AcousticHomespan wallboard

Cormet AcousticHomespan C Studs at450mm centres


Timber infill inweb of stud atdoor openings

All wallboardperimeters sealedwith LafargeIntumescentAcoustic Sealantto ensure systemperformance

Drylining electrical boxesare available to alloweasy installation withoutthe need for timbernoggings. Note that abaffle may be needed tomaintain the acousticand fire performance ofthe partition

Cormet AcousticHomespan StarterStud

Floor track fixed at 600mmcentres – use timber soleplate to underside of trackon uneven floors

Rubber grommet used to protect cable passingthrough service punch

Cormet HomespanU Track snippedand folded to formhead to dooropening



117

3

Application details

Ceiling detail (section) 10mm deflection head – 60 minute fire rated

Alternative skirting fixing details (sections)

Junction with masonry wall (plan) Partition end (plan) T junction (plan)

Corner junction (plan)

Typical door jamb detail (plan)

135º splayed corner (plan)


Cut wallboard fordoor openings asshown to avoidjoints runningparallel toframing studs at side of door

Door openingshown dotted

Cormet U Track fixedat 600mm centres


Cormet AcousticHomespan C Stud 6mmshorter than floor toceiling height

15mm Lafarge Firecheck

Cormet C Stud to stop10mm short of CormetU Track to allow fordeflection

10mm allowance fordeflection betweenCormet U Track andCormet FS90/W FlatStrap


Cormet U Track

Cormet C Stud

Cormet FS90/WFlat Strap


Timber infill in webof stud 32x38mm

Door lining

15mm Lafarge Acoustic Homespan wallboard

Cormet Acoustic Homespan CStuds fixed together at 600mmvertical centres, and to floorand ceiling Cormet U Tracks

Cormet Acoustic Homespan CStuds fixed together at 600mmcentres, and to floor andceiling Cormet U Tracks

15mm LafargeAcoustic Homespanwallboard

Cormet MFC 135Splayed SupportAngles

Cormet AcousticHomespan C Stud

Lafarge DirectBond liningsystem

Cormet Drylinerlining system

15mm LafargeAcousticHomespanwallboard

LafargeIntumescentAcoustic Sealant

Cormet Acoustic HomespanDeep Flange U Track

Cormet Acoustic HomespanU Track on sole plate


Cormet AcousticHomespan Starter Stud

118



Cormet Acoustic HomespanPartition

Scope

A lightweight, durable and highperformance partition systemsdeveloped for the housing market.

The system has been designed toachieve a 40 RwdB sound ratingwithout insulation and meets BS 7671 requirements for electricalinstallation.

Additional clauses

Add general clauses if required for:

– Expansion/movement joints

– Health and safety

– Storage of Materials

– Site conditions and workmanship

NBS clauses


To complete the clause select theappropriate data as indicated on theright.


Specification clauses



Fire resistance: 30 mins

Airborne sound insulation ....................Rw dB

Thickness ....................mm

Weight ....................kg/m2

Grade to BS 5234: Heavy



StudsCormet Acoustic Homespan Studs, reference AHS44/R or AHS50/R, width 44 or50mm at max 450mm centres.

Head deflection allowanceConsult with Lafarge Plasterboard Ltd Technical Dept for recommendationsand details.

Floor trackCormet U Track, reference UT45/R or UT52/R, width 45 or 52mm fixed at600mm centres.

Head trackCormet U Track, reference UT45/R or UT52/R, width 45 or 52mm fixed at600mm centres.







BoardingSingle layer of 15mm Lafarge Homespun wallboard to each side.

Board fixingsLafarge Drywall Self Tapping screws at 300mm centres.

Length: 32mm

FinishingLafarge Taping and jointing system

Primer/sealer1 coat Lafarge Universal Sealer prior to paint or wallpaper, or

2 coats Lafarge Drywall Sealer when vapour control is a consideration.



Notes:





119

3

Omega Acoustic Partition

Scope

A lightweight, durable and highperformance partition systemdeveloped to provide improvedsound performance.

Additional clauses






NBS clauses






Fire resistance: ....................mins

Airborne sound insulation ....................Rw dB

Thickness ....................mm

Weight ....................kg/m2

Grade to BS 5234: ....................



StudsOmega Acoustic Studs, reference AS70/R or AS90/R, width 70 or 90mm at max600mm centres.

Head deflection allowanceConsult with Lafarge Plasterboard Ltd Technical Dept for recommendationsand details.

Floor trackCormet U Track, reference UT72/R or UT92/R, width 70 or 90mm fixed at600mm centres.

Head trackCormet U Track, reference UT72/R or UT92/R, width 70 or 90mm fixed at600mm centres.














FinishingLafarge Taping and jointing system

Primer/sealer1 coat Lafarge Universal Sealer prior to paint or wallpaper, or

2 coats Lafarge Drywall Sealer when vapour control is a consideration.



Notes:



120



Step oneMark out the line ofthe partition. FixCormet U Track totimber or concretefloor along thesetting out line at600mm centres,using suitable fixings.

Step twoCut the Cormet UAcoustic Stud tolength as necessaryusing Lafarge tinsnips. Studs shouldbe cut 5mm shorterthan the floor toceiling height.

Step threeUsing a spirit level toensure it is plumb, fixa Cormet Stud to theend wall, withsuitable fixings at600mm centres.

Step fourPlace the ceilingCormet U Track ontop of the end wallstud. Then, using anCormet AcousticStud and spirit level,ensure the oppositeend of the ceiling UTrack is plumb withthe floor U Track andscrew-fix it intoposition at 600mmcentres.

Step fiveInstall allintermediateAcoustic C Studs. CutStuds 5mm shorterthan the floor toceiling height toallow for floorvariations. Insert theStuds into theCormet U Tracks at450mm centres andtwist to lock. Theintermediate studsshould all face thesame way. To allowadjustment whenfixing plasterboards,Studs should not bescrew fixed to theCormet U Tracks.

Step sixUse Starter Studs, ifrequired, at dooropenings, corners, T junctions and stopends as shown indetails. These extrastuds must be fixedto ceiling and floor U Tracks with LafargeWafer Head SelfTapping Screws orusing a crimpingtool.

1

2

3

4

5

6

Installation

Note: When installing the U Tracksdirectly onto new concrete which hasnot completely dried out, a dampproofing membrane should be used.On uneven floors a timber sole platemay be required.

To maximise the acoustic and fire performance useLafarge Intumescent Acoustic Sealant and seal the gapbetween the perimeters and the wallboard oralternatively a continuous bead can be applied to theback of the Cormet U Tracks and perimeter studs.

Note: Lafarge intumescent Acoustic Sealantshould be applied as shown above.



121

3

Step sevenForm the doorheader by using apiece Cormet UTrack. Cut the trackso that it is equal tothe width of thedoor frame plus aminimum 300mm, inorder to allow150mm at each endto be cut and foldeddown.

Step eightSecure the header tothe Cormet AcousticStuds using acrimping tool orLafarge Wafer HeadSelf Tapping Screws.

Step tenFix Lafargewallboard to oneside of the partition.Cut the board 5mmshorter than thefloor to ceilingheight, butt firmlyagainst the ceilingand fix with LafargeDrywall Self-TappingScrews at 300mmcentres in the field ofthe board and200mm at thepartition perimeter.

Step elevenWhen one side iscomplete, repeat forthe other side of thepartition, ensuringthat the joints arestaggered.

7

8

10

11

Installation

Step nineForm a timberbackgroundconstruction tocreate a secure fixingfor the door frameby placing a suitablysized timber insertinto the back of doorframe studs andheader Track. Securethese timbers usingLafarge Drywall HighThread Screwsthrough the face ofthe studs into thetimber.

Step twelveFinish as requiredprior to decoration.Refer to Section 7.

9 12

122

P A R T I T I O N S


Case study


P A R T I T I O N SCORMET C STUD SYSTEMS

123

3

The wide range of Cormet MetalPartitions allows repeatable,guaranteed performance to beachieved across a broad range ofapplications from apartments, cinemasand factories to hospitals, museums,and schools.

124



Cormet PartitionsCormet metal stud partitioning is aneconomical friction-fit system usedfor the assembly of frames for non-loadbearing partitions. The uniquedesign of the components ensureshigh strength with easy installation.

Cormet partitions are suitable fordomestic and commercial use. Theyare strong high performance systemswhich are:

• cost effective

• lightweight

• versatile

• able to achieve high levels of fireresistance, acoustic and thermalinsulation.

Performance

The selection of Cormet C Stud size,and the type, number and thicknessof plasterboard layers will dependon the partition height and theperformance required for fireresistance and sound insulation.Refer to the performance tables 3.1to 3.6.

Lafarge PerformanceBoard* PartitionsLafarge performance partitionscomprise Cormet C Stud framingand Lafarge performancewallboards to provide a strongerpartition which is more resistant toknocks and scratches.

In addition, Lafarge performancepartitions provide superior soundinsulation and fire resistance.

Performance

Lafarge performance wallboards aredefined as Class 0 in accordancewith National Building Regulations1991 Approved DocumentsB1/2/3/4/5 Fire Safety and BuildingStandards (Scotland) Regulations1990, Regulation D2 when tested toBS 476: Part 6: 1989 and Part 7: 1997and Euroclass A2. The gypsum coreis classified as non-combustiblewhen tested in accordance with BS476: Part 4: 1970 and Euroclass A1.Lafarge jointing compounds, metalsystems, textures and bondingcompounds are non-combustiblewhen tested in accordance with BS476: Part 4: 1970 and Euroclass A1.

Introduction

Intermediate studsinserted in floorand ceiling tracks

Cormet trackfixed to soffit at600mm centres

Perimeter Cormetstud fixed to endwall at 600mmcentres

LafargeIntumescentAcoustic Sealantaround perimeter

Single layer boarding: jointson opposite faces offset, alljoints taped and filled

Cormet track fixed tofloor at 600mm centres

Timber sole plate, if requiredon uneven floors

Partition with single layer boarding

Lafarge Intumescent Acoustic Sealantapplied around perimeter of partition

LafargeIntumescentAcoustic Sealant toback of all tracksand end studs

Note:* Toughcheck, dBcheck, Firecheck,Megadeco and Moisture ResistantFirecheck.



125

3

Components

Table 3.16 Cormet Partitions componentsComponent Width (mm) Length (mm) Lafarge code

C Stud 50 2400, 2700, 3000, 3600 CS50/R

Red gauge 0.5mm 60 2400, 2700, 3000, 3600, 4200 CS60/R

70 2400, 2700, 3000, 3300 CS70/R

3600, 4200, 4800

90 2700, 3000, 3600, 4000, 4200 CS90/R

146 2400, 2700, 3000 CS146/R

3600, 4200, 4800

C Stud 70 3600, 4200 CS70/B

Blue gauge 0.7mm 90 3600, 4200 CS90/B

146 3600, 4200, 4800, 5400, 6000 CS146/B

C Stud 90 4800, 6000, 7200 CS90/W

White gauge 0.9mm

C Stud 70 4800 CS70/Y

Yellow gauge 1.2mm 90 3600, 4800, 6000 CS90/Y

146 6000 CS146/Y


Red gauge 0.5mm 62 3000 UT62/R

72 3000 UT72/R

92 3000 UT92/R

148 3000 UT148/R

U Track Deep Flange 52 3000 UDT52/B

Blue gauge 0.7mm 62 3000 UDT62/B

72 3000 UDT72/B

92 3000 UDT92/B

148 3000 UDT148/B

U Track Extra Deep 72* 3000 UXT72/B

Flange 92** 3000 UXT92/W

*Blue gauge 0.7mm 148** 3000 UXT148/W

**White gauge 0.9mm

Fixing Channel 99 2400 MFIX

White gauge 0.9mm

Metal Angle 23 x 30 3600 MFC2330

25 x 25 3600 MFC2525

25 x 50 3600 MFC2550

Splayed Corner 50 x 50 3600 MFC135

Support Angle

Flat Strap 50 2400 FS50/R

90 2400 FS90/W

Lafarge Intumescent 0.9 litre ACOUSTIC (INTU)

Acoustic Sealant 0.38 ACO 38 (INTU)

Lafarge Drywall – 25 to 76 See page 327

screws as appropriate

Component specifications may vary from those shown.

The range of Cormet partitioncomponents is shown in the tableopposite and in the drawings on thefollowing page.

Rigidising plus vertical ribs in thestud webs ensures stiffness withstrength, whilst the fold-outs allowfor better services access. Theflanges have deep knurling foreasier screw-fixing, and plasterboardalignment guides, all of whichmakes installation even easier.

Colour coding is used to identifymetal thickness: Red (R) 0.50mm Blue (B) 0.70mm White (W) 0.90mmYellow (Y) 1.2mm.

Maximum heights shown inperformance tables 3.1 to 3.8 referto 0.50mm thick studs (Red gauge).If 0.70mm thick studs (Blue gauge)are used the maximum height canbe increased by 0.30m for systemsfaced with a single layer ofplasterboard and by 0.60m fordouble layer systems.

Cormet Deep Flange U Tracks areused for partitions with heightsabove 4.2m, or at the soffit where adeflection head is required.

Cormet Fixing Channel MFIX orCormet Flat Strap FS90/W can befixed horizontally between twometal studs to provide extra supportand maintain fire integrity of thesystem when board heights areexceeded.

As an alternative Cormet Flat StrapFS50/R may be used betweenwallboards on double layer boardsystems.

All components are manufactured to BS 7364: 1990 Specification forgalvanised steel studs and channelsfor stud and sheet partitions andlinings using screw fixed gypsumwallboards.

126



U TrackUT52/R

U TrackUT62/R

U TrackUT148/R

U Track Deep

Flange UDT62/B

U TrackDeep

FlangeUDT148/B

U Track Deep Flange

UDT52/B

U TrackUT92/R

U TrackUT72/R

U TrackDeep

FlangeUDT72/B

U TrackDeep

FlangeUDT92/B

Fixing ChannelMFIX

30

50

50

99

52

6

U Track Extra DeepFlange UXT72/B

U TrackExtraDeep

FlangeUXT92/W

U TrackExtraDeep

FlangeUXT148/W

70

72

Metal AngleMFC2330

Metal AngleMFC2525

Metal AngleMFC2550

25

25

25

23

30

Components

Splayed CornerSupport MFC135

50

50

Flat StrapFS90/WFS50/R

90

50

135º

6 6

36 34

50

C StudCS50/R

60 70 90 146

C StudCS60/R

C StudCS70/RCS70/BCS70/Y

C StudCS90/RCS90/BCS90/WCS90/Y

C StudCS146/RCS146/BCS146Y

52 62 72 92 148

62 72 92 148

92 94 148

U TrackExtraDeep

FlangeUXT94/BUXT94/W

KEY

ProductCS: C Stud

IS: I Stud

UT: U Track

UDT: Deep Flange Track

UXT: Extra Deep Flange Track

72

36 34

52

30 30

52

50 50

52

70 70

Flange Dimensions (mm)

C Stud CS50/R U Track UT52/R U Track DeepFlange UDT52/R

U Track Extra DeepFlange UXT72/R

Product/R Red gauge

0.50mm

/B Blue gauge0.70mm

/W White gauge0.90mm

/Y Yellow gauge1.20mm

CS50/R

Denotessectionprofile

Denotessectionwidth

Denotessectiongauge



127

3

Application details

Joints on opposite faces offset

All joints taped and jointed

Joints on opposite faces offset, joints staggered between layers

All joints in the outerlayer taped and jointed

Partition with single layer boarding

Partition with two layer boarding

System assembly

Framing

Set out Cormet U Tracks alongthe setting out line of thepartition at floor and ceiling, andfix at 600mm centres. If applyingthe Cormet U Tracks direct tonew concrete which has notcompletely dried out, a dampproofing membrane should beused.

Timber sole plates

For floors that are uneven orbeing screeded after theinstallation of the partition, atimber sole plate may berequired.

Stud lengths

Cut Cormet C Studs 5mm shorterthan the floor to ceiling height toallow for floor variations. Insertthe Cormet C Studs into theCormet U Tracks and twist tolock. Perimeter Cormet C Studsshould be fixed at 600mm centreswith the webs flat againstabutting walls or partitions.

The intermediate Cormet C Studsshould all face the same way andbe positioned at either 400mm or600mm centres as required.Arrange the framing so thatplasterboard widths of less than300mm are avoided. Intermediatestuds should not be fixed toCormet U Tracks to allow foradjustment when fixing boards.

Openings

Use extra Cormet C Studs atopenings, corners, junctions andstop ends, fixing to head andfloor U tracks with Lafarge WaferHead Screws or crimping tool.

Doors and windows can be builtinto the partitioning bypositioning and fixing full-lengthstuds on each side of theopenings. Cormet U Track is cutto form the head of the opening,and lined with 38mm deeptimber where required.

Make provision for fixtures asdescribed in table 3.23.



Application details

Mineral wool insulationsuspended on CormetInsulation Holder

Electrical boxes

Rubber grommets

Double boardedCormet C Stud

partition, wallboardas specified

For an extensiverange of partition

types see systemreferences

pages 28-31

All wallboard perimeterssealed with LafargeIntumescent Acoustic Sealantto ensure system performance

Drylining electricalboxes are availablethat allow easyinstallation withoutthe need for timbernoggings

Cable protection atservice cut-outs

Floor track fixed at600mm centres

(Use timber sole plateto underside of track

on uneven floors)

128

Suspension of mineral wool quiltOverheight partition Partition with double layer boarding

30mm glass/rockmineral wool quilt

Cormet InsulationHold Strip Joints on opposite

faces offset

All jointstaped andfilled

Cormet Fixing ChannelMFIX to provide supportfor horizontal board edges

Single boarded CormetC Stud partition,

wallboard as specified

Timber subframeto door opening

CormetInsulation HoldStrap positionedat 1200mmvertical centres

Wallboards fixed at200mm centres

around perimeter ofeach board and at300mm centres inthe centre of the

board



129

3

Application details

Ceiling detail (section)


Cormet U Track fixedat 600mm centres

Cormet C Stud 5mmshorter than floor toceiling height

10mm deflection head fire rated up to 60 minutes(section)

Partition end (plan) T junction (plan)Junction with masonry wall(plan)

Corner (plan)

Typical door jamb detail (plan)

Alternative skirting fixing details (sections 1 to 3)


Cut wallboard for dooropenings as shown toavoid joints runningparallel to framingstuds at sides of door

Door opening showndotted

Cormet C Studs fixedtogether at 600mmcentres, and to floor andceiling Cormet U Tracks

Cormet C Studs fixedtogether at 600mmcentres, and to floor andceiling Cormet U Tracks


Cut Cormet C Stud to stop10mm short of Cormet U Trackas specified to allow fordeflection

10mm allowance fordeflection betweenCormet U Track andCormet Flat Strap FS90/W

Cormet U TrackDeep Flange

Cormet Flat StrapFS90/W

Lafarge Direct Bondlining system

Cormet Drylinerlining system

Timber subframeshown here facefixed, alternative isto infill timber intothe Cormet Stud

Door liningWallboard asspecified

Cormet starter stud


Offcuts of studs boxed together and fixedvertically into track midway between studs

Cormet U Trackon sole plate



Cormet U Trackwithout sole plate

Wallboard asspecified

Cormet C Stud

15mm Lafarge Firecheck

Cormet U TrackDeep Flange

1 2 3

135º splayed corner (plan)

Cormet MFC 135Splayed SupportAngles

CormetC Stud

Note on head packer:Max deflection Packer required



15mm 1x19mm Plank


25mm 2x15mm Firecheck*Notes: * Firecheck can be substituted by Megadeco, Toughcheck or MR Firecheck

** Firecheck can be substituted by 25mm Firecheck Coreboard

130




Cormet Metal StudPartitions

Scope

Metal stud partitions withindomestic and commercial buildingswhere maximum height may exceedboard lengths and/or where fire andacoustic performance is required.

Additional clauses






NBS clauses



System reference (Insert Lafarge system reference from Performance Tables)Location ........................Client reference ........................PerformanceMaximum height ....................mFire rating ....................minsAirborne insulation ....................RwdBThickness ....................mmWeight ....................kg/m2

Grade to BS 5234 .........................Horizontal jointsIf partition height exceeds board height, use Cormet Channel MFIX or CormetFixing Strap FS90/W in single boarded partitions or Cormet Fixing Strap FS50/Ror FS90/W in double boarded partitions.Insulation(Specify insulation thickness and grade/density from the Performance Tables)Acoustic mastic6mm bead of Lafarge Acoustic Sealant around perimeter of the framing.StudsCormet C Studs, reference CS50/R, CS60/R, CS70/R, CS90/R, CS146/R, CS70/B,CS90/B, CS146/B, CS90/W, CS70/Y, CS90/Y or CS146/Y, width 50, 60, 70, 90 or146mm at max 600mm centresHead deflection allowanceConsult with Lafarge Plasterboard Ltd Technical Dept for recommendationsand details.BracingCormet Flat Strap FS50/R at mid height.Floor trackCormet U Track, reference UT52/R, UT62/R, UT72/R, UT92/R, UT148/R, width 52, 62, 72, 92, 148mm fixed at 600mm centres.Head trackCormet U Track, reference UT52/R, UT62/R, UT72/R, UT92/R, UT148/R, width 52, 62, 72, 92, 148mm fixed at 600mm centres.Floor/head track fixingsSpit Pulsa 700P nailing system for concrete or steel using fixings dependent onmaterial substrates at max 600mm centresStandard concrete use Spit C6 Pins (Select from 20, 25, 30, 35, 40)mm, orHard concrete use Spit HC6 Pins (Select from 17, 20, 22, 27)mm, orSteel use Spit SC6 Pins (Select from 15, 20)mmSpit Hammer-In fixing for concrete at maximum 600mm centresType Spit Hit CL35 (Select from 30, 40, 50)mmBoardingSingle or double layer of wallboard.Inner layer (Specify wallboard from the Performance Tables)Outer layer (Specify wallboard from the Performance Tables)Board fixingsLafarge screws at 300mm centresType Drywall Self-tapping, or Toughcheck Self-tapping, or Checkpoint Self-tapping, or Megadeco Self-tapping.Length, inner layer (Select from 25, 32, 38, 41, 44, 51, 57, 63, 67, 76)mmLength, outer layer (Select from 25, 32, 38, 41, 44, 51, 57, 63, 67, 76)mmFinishingLafarge Taping and jointing system, orLafarge Supreme Skim Plaster, orLafarge Predeco taping and jointing systemInstallationAll materials, unless otherwise indicated, shall be supplied by LafargePlasterboard Ltd. and shall be installed in accordance with their currentliterature and in accordance with BS 8212: 1995.Given the vast selection of different types of substrate that are encounteredon-site, it is strongly recommended that adequate site tests be carried out toestablish a recommended load on fixings.

Notes:





131

3

Installation

Step twoCut Cormet U Track(and Cormet C Studs)to length asnecessary usingLafarge tin snips.

Cormet C Studs tobe cut 5mm shorterthan floor to ceilingheight.

Step threeInstall a Cormet CStud, using a spiritlevel to plumb onend wall; screw fix at600mm centresusing suitable fixings.

Note: Fix opposite endwall Cormet C Stud onlyafter ceiling Cormet UTrack has been installed.

Step fourPlace ceiling CormetU Track onto end wallCormet C Stud. Usinga Cormet C Stud andspirit level, plumbopposite end ofceiling U track withfloor U track andscrew-fix into positionat 600mm centres.

Fix remaining endwall Cormet C Stud.

Step fiveMark floor and ceilingat centres as specifiedbelow for the locationof intermediate C Studs:

At max. 400mmcentres for 9.5mmplasterboard or600mm centres for12.5 mm plasterboard.Arrange the framingso that plasterboardwidths of less than300mm are avoided.

See step 9 for installation ofintermediate studs.

Step sixUse extra Cormet C Studs at openings,corners, T junctionsand stop ends asshown in details.These extra studsmust be fixed tohead and floorCormet U Trackswith Lafarge WaferHead Self TappingScrews or crimpingtool.

Note: The door framebackground metalconstruction detailsshown above, form oneof three possiblealternatives.

1

2

3

4

5

6

To maximise the acoustic and fire performance useLafarge Intumescent Acoustic Sealant and seal the gapbetween the perimeters and the wallboard oralternatively a continuous bead can be applied to theback of the Cormet U Tracks and perimeter studs.

Step oneFrom a fixed pointmark out the line ofpartition. Fix CormetU Track to timber orconcrete floor alongthe setting out lineof the partition at600mm centres usingsuitable fixings.

Note: A timber soleplate may be requiredon uneven floors orwhen partitions areinstalled prior to screedbeing laid.

If applying the Cormet U Trackdirect to new concrete which has not completely dried out, adamp proofing membrane shouldbe used.

132



Step sevenForm the doorheader by using a piece of Cormet U Track. The lengthshould be equal tothe width of the doorframe plus aminimum of 300mmin order to allow150mm at each endto be cut and foldeddown.

Step eightSecure header ontoCormet C Studsusing a crimping toolor Lafarge WaferHead Self TappingScrews.

This detail appliesto all door frameassembly alternatives.See step 5.

Step nineInstall all intermediateC Studs.

Cut Cormet C Studs5mm shorter thanthe floor to ceilingheight to allow forfloor variations. Insertthe Cormet C Studsinto the Cormet UTracks and twist tolock. The intermediateCormet C Studsshould all face thesame way. Theyshould not be fixedto Cormet U Tracksin order to allow foradjustment whenfixing plasterboards.

Step tenForm as required,one of the followingalternative timberbackgroundconstructions forfixing door frames:

(a) Fix a 38mm x38mm timber insertinto back of doorframe Cormet CStuds and header.Secure using LafargeDrywall High ThreadScrews through faceof Cormet C Studinto the timber.

(b) Fix a timbersubframe to theface of the doorframe Cormet CStuds and headerusing LafargeDrywall Self TappingScrews.

Step elevenInstall door frame into position andsecure by screwingthrough the doorframe into one of the alternativebackgroundconstructions aboveusing Lafarge DrywallHigh Thread Screws.Ensure that the screwspenetrate each of thecomponents formingthe backgroundconstructions.

Step twelveInstall plasterboardto one side of the partition. Cutplasterboard 5mm to 8mm shorter thanthe floor-to-ceilingheight, butt firmlyagainst the ceilingand fix with LafargeDrywall Self-TappingScrews at 300mmcentres.

Note: Use ToughcheckDrywall Screws forToughcheck Partitionsand Checkpoint SelfTapping Screws fordBcheck Partitions.

7

8

9

10

11

12

Installation

Timber stud partitions are frequentlyused in timber-frame houses, in smallrenovation projects and in homeextensions where they may be loadbearing or non-load bearing,depending on specification.

Plasterboard can be screw fixed totimber, which offers superiorperformance and limits the risk of nailpopping caused by the timber sub-frame drying out. Alternativelyplasterboard can be nailed directly tothe timber.


P A R T I T I O N STIMBER STUD SYSTEMS

133

3

134



Lafarge Intumescent AcousticSealant around perimeter

Timber studs: for sizeand centres seeperformance tables

Single layer boarding, joints on oppositefaces offset, all joints taped and filled

Timber soleplate

Timber stud partitionLafarge Drywall TimberStud PartitionsTimber stud partitions are suitablefor limited heights, and typically fordomestic use.

Performance

The selection of stud size and type,number and thickness of boardlayers will depend on the partitionheight and performance requiredfor fire resistance, sound insulationand duty rating to BS 5432: Part 2.Refer to the performance tables 3.9to 3.10.

Lafarge plasterboards are defined asClass 0 in accordance with NationalBuilding Regulations 1991 ApprovedDocuments B1/2/3/4/5 Fire Safety andBuilding Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1997 and Euroclass A2.The gypsum core is classified as non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1. Lafarge jointingcompounds, metal systems, texturesand bonding compounds are non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1.

At board perimeterscrew fix at 200mmcentres or nail fix at150mm centres

Introduction

In the field of theboard screw fix at300mm centres ornail fix at 150mmcentres

Timber stud partition – high performance wall(RFL 050 shown)

50mm glass mineralwool minimumdensity 16 kg/m3

Timber stud

Cormet FlatStrap

Air gap

Two layers of 15mmLafarge Firecheckwallboard

High performance walls

High performance timber framedwalls are constructed from twoindependent timber frames with acavity between. Each side is linedwith two layers of 15mm LafargedBcheck wallboard. 50mm glassmineral wool insulation is appliedbetween the studs to both frames. A brace secures the two frames atmid height.

High performance walls should bekept free of service penetrations. If this is not possible, baffle detailsshould be installed – for guidancerefer to pages 150-151, which offersa number of solutions for Cormetmetal stud partitions, which workon the same principles for timberframe, or call the TechnicalEnquiryline for advice.



135

3

Table 3.17 Timber stud componentsComponent Dimensions Lafarge code

Lafarge Intumescent 0.9 litres ACOUSTIC (INTU)

Acoustic Sealant 0.38 litres ACO38 (INTU)

Lafarge Drywall High 32-63mm 32DHT25, 38DHT25

Thread Screws 41DHT25, 51DHT25

63DHT25

Cormet Resilient Bar 3000mm RBD3000

Drywall Nail 30-65mm NAIL30ZINC

NAIL40ZINC

NAIL50ZINC

NAIL60ZINC

Components

The components used in LafargeDrywall Timber Stud partitions arelisted in table 3.17.

System assembly

All framing must be straight, plumband true, and provide a firm supportfor the plasterboards. Timber studsshould be installed at maximum400mm centres for 9.5mmplasterboard, and at maximum600mm centres for 12.5mm and15mm plasterboard. Framing shouldbe arranged so as to avoidplasterboard widths of less than300mm. Plasterboard edges must besupported at all openings andcorners. All framing should providea minimum bearing width for theplasterboard of not less than 38mm.The timber studs must be fixed totimber floor and ceiling plates.

The plasterboard should be fixedwith Lafarge Drywall High ThreadScrews at 200mm centres at theboard perimeter and 300mm centresin the field of the board, or LafargeDrywall Nails at 150mm centres forboth perimeter and field ofboarding. See tables 3.19 and 3.20 for recommended lengths of nailsand screws.

Where sound insulation is required,apply a 6mm continuous bead ofLafarge Intumescent AcousticSealant around the perimeter of theframing or wallboard.

Lafarge Cove provides a neat finishto the wall/ceiling junction. SeeSection 7.


Where the Cormet Resilient Bar is tobe fixed to timber studs thefollowing centres apply.

For single layer 12.5mmplasterboard fix Cormet Resilient Barat 400mm centres horizontally.

For double layers of 12.5mmplasterboard and thickerplasterboard, fix Cormet ResilientBar at 600mm centres horizontally.

Fix initial Cormet Resilient Bar50mm down from ceiling, lastResilient Bar 50mm from floor.

Screw fix the Cormet Resilient Barsto the timber supports using 32mmDrywall High Thread Screws.

Screw fix the plasterboard to theCormet Resilient Bar only, ensuringthe screw does not touch the timbersubstrate.

Components

Table 3.20 Recommended naillengths for timber framingConstruction Plasterboard Nail Length

thickness (mm) (mm)

Single layer 12.5 40

15.0 40

19.0 50

Double layer 12.5 + 12.5 50

12.5 + 19.0 65

15.0 + 15.0 65

Table 3.19 Recommended screwlengths for timber framingConstruction Plasterboard Screw

thickness (mm) length (mm)

Single layer 6 32

12.5 38

15.0 38

19.0 41

Double layer 6 + 6 38

12.5 + 12.5 51

12.5 + 19.0 63

15.0 + 15.0 63

Table 3.18 Recommended screwlengths for fixing plasterboardto Cormet Resilient Bars

Plasterboard thickness Screw length(mm) (mm)

12.5 25

15.0 25

19.0 32

12.5 + 12.5 38

19.0 + 12.5 44

15.0 + 15.0 44

17

45

6

19

Cormet Resilient Bar RBD3000

136



Application details

Timberseparatingwall

Two layers 15mm LafargedBcheck wallboard

Typical timber frame construction

Two layers of 50mm mineralwool insulation betweentimber studs

38 x 89mm timber studsat 600mm centres

12.5mm LafargeEcheck wallboard

each side ofpartition

Timber studs at600mm centres

25mm mineralwool insulation

between timberstuds

Internaltimber

partition



All joints to occuron centre oftimber studs

Timber nogging tosupport horizontaledge of plasterboard

Internaltimber floor



137

3

Application details

Party wall junction with partition – alternatives(plan)

Seal allperimeter

joints withtape or caulkwith sealant

Corner

T junction – acoustic (plan)

Door jamb

Partition head and sill Timber separating wall junction with internal floor

Wallboard andinsulation as specified



Seal allperimeterjoints withtape or caulkwith sealant

Full heighttimber blockingto provide fixingfor partition andreduce flankingsound

Flexiblecavitystop

Wallboardand insulation

as specified

Separatingwall liningcontinuous

Timberspacer

Partition end (plan)



Wallboard andinsulation asspecified

Seal corner joint withtape or caulk withsealant


Lafargewallboardandinsulation asrequired

T junction – alternative



138



Lafarge Timber StudPartitions

Scope

Internal walls, partitions, separatingwalls and external walls constructedusing softwood timber studs linedwith Lafarge plasterboards.

Additional clauses






NBS clauses



The Lafarge Plasterboard websitecontains a full set of NBS clauses,completed for each LafargePlasterboard system. See:www.lafargeplasterboard.co.uk/nbssearch/index.asp0




Fire rating ....................mins


Thickness ....................mm

Weight ....................kg/m2

Grade to BS 5234 .........................

Horizontal jointsIf partition height exceeds board height, use horizontal timber noggings toprovide support for fixings.


Acoustic mastic6mm bead of Lafarge Intumescent Acoustic Sealant around perimeter of theframing.

Timber framingTimber studs ..............mm x ..............mm at max 600mm centres

Timber sole plate ..............mm x ..............mm fixed at 600mm centres.

Timber head plate ..............mm x ..............mm fixed at 600mm centres.




Board fixingsLafarge Drywall Self Tapping Screws at maximum 300mm centres,


Length, outer layer (Select from 25, 32, 38, 41, 44, 51, 57, 63, 67, 76)mm, or

Lafarge Drywall Nails at maximum 150 mm centres at the board perimeter andmaximum 200mm centres in the field of the board,

Length, inner layer (Select from 30, 40, 50, 65)mm

Length, outer layer (Select from 30, 40, 50, 65)mm





Notes:




P A R T I T I O N SMASONRY SYSTEMS

139

3

Masonry separating walls remain byfar the most common constructionmethod within the housebuildingmarket. However, in conjunction withLafarge drywall systems the overallperformance with regard to thermaland sound, as well as the speed ofcompletion, can be greatly improved.

Drywall Benefits and TypicalSystem SolutionsDirect Bond to inner skin ofconstruction

• Reduction in wet trades

• Quicker completion times

• Reduced drying out time

• Improved thermal performance

Cormet Dryliner to inner skin ofconstruction

• Improved thermal performance

• Reduction in wet trades

• Quicker completion times

• Reduced drying out time

• Creates cavity in which services canbe installed

• Greater acoustic performance

140

P A R T I T I O N SMASONRY SYSTEMS


Junction with external cavity wall

5mm (minimum) foamedpolyethylene resilient strip

Blockwork and cavity width asRobust Detail specification

Party wall junction(section with internal floor)

Party wall junction(section with party floor)

Separating floor as RobustDetail E-FC-1

Flexible cavity stop

12.5mm Lafarge Standardwallboard on dabs

Cormet Suspended Ceiling system with75mm (minimum) void and one layer of

Lafarge Echeck wallboard


Concrete planksbuilt into wall

Cavity insulation notshown for clarity

Robust Detail Separating Wall – types E-WM-3, E-WM-4, E-WM-5 and E-WM-6

8mm cement/sand scratch coat towhole wall

Continuousribbon ofadhesive

8mm cement/sand render

Timberfloorsupportedon joisthangers


Drywall solutions are becomingincreasingly popular due to the ease of construction and flexibility offeredto the architect to accommodatespecialist design features – whilebeing able to maintain the practicalrequirements of fire and acousticperformance.

In the following section we offer a wide range of typical drywallsolutions. If the detail you require is not shown, please contact ourEnquiryline.


P A R T I T I O N SSPECIALIST JUNCTIONS AND INSTALLATIONS

141

3

142



Deflection head details

Detail of telescopic head – exploded view

Studs to be cutshort by 80mmplus deflection

Head track UXT148/W

Stud CS146/R

Length = 370mm plusdeflection required

TrackUXT148/W

146mm widestud as specified

Detail of telescopic head– assembled view

The box totallyencloses the C

stud and holds itin place.

The C stud slidesup and down

within the box

The telescopic deflection head is foruse where deflection is greater than40mm. The detail can allow fordeflection up to 150mm. A typicalarrangement for enclosing thetelescopic head and maintain the fire performance is shown here.

Twin wall 10mm deflection head detail up to 60 minutes fire rated

15mm LafargeFirecheck wallboard


Lafarge U Track DeepFlange

Studs as specified,cut short 10mm

Wallboards as specified,cut short 10mm

Insulation asspecified

Cormet V Brace

Twin wall deflection head detail up to 60 minutes fire rated

Rockwool withcloak angle

Lafarge U Track DeepFlange

Cormet FS50 Flat Strapbetween layers, or as

opposite

Wallboards as specified,cut short 10mm


Cormet V Brace

Lafarge Firecheck as packer fordeflection – see notes below

Purlin

CS146/R Cormet C Stud at 600mm

centres between andscrew fixed to purlins

CS50/R Cormet C Studsat 600mm centres

Telescopic head – see details below

UT52/R Cormet U Track

UT62/RCormetU Track

LafargeIntumescentAcoustic Sealantat junctions

Single stud partition with onelayer of plasterboard –deflection head detail up to 60 minutes fire rated

Rockwoolinsulation withcloaking angle

Lafarge Firecheckpacker as specified

Studs andwallboards asspecified cutshort by up to40mm

Cormet MFIX orFlat StrapFS90/W forsingle boardedpartitions


Allowance fordeflection

Telescopic deflection head with fire umbrella

Cormet Flat Strap FS90/Ror FS90/W between layers

DeepFlangeU Track

MFC2330MetalAngle

Note on head packerMax deflection Packer required



15mm 1x19mm Plank


25mm 2x15mm Firecheck*Notes: * Firecheck can be substituted by Megadeco,

Toughcheck or MR Firecheck** Firecheck can be substituted by 25mm

Firecheck Coreboard



143

3

At profiled soffit (along profile)

Cormet MFIXacross profile

15mm LafargeFirecheckwallboard

Studs asspecified cutshort

Wallboardsas specified

Appropriateinsulation byothers

LafargeFirecheckrefer tonote onheadpacker

Cormet FlatStrap betweenlayers

Alternative details at profiled soffit (across profile)

Deflectionzone

Studs andwallboardas specified

Cormet Flatstrap


Insulationas specified

Deflection head details

Appropriateinsulation by others

Studs andwallboard as

specified

Lafarge Firecheckrefer to note on

head packer


Cormet Flatstrap

Junction with purlins at 1800mm centres

Deep FlangeU Track

Lafarge wallboardas specified

Timber fillet to suitangle of roof

Lafarge Firecheck referto note on head packer

Studs and wallboardcut short by requireddeflection

Partition perpendicular to purlins

Studs andwallboard cut

short to allow fordeflection

2x15mm LafargeFirecheck

wallboard



Purlinzone

Cormet U Trackto suit stud size


Deflection head using CormetDHB Bracket Lafarge Coreboard

as packer

Rockwool packerif no ceiling fitted,or 120mins fireresistance required

Cormet DHBDeflection HeadBracket screwfixed to headtrack onlyCormet MFIX forsingle boardedpartitions

C stud cutshort bydeflectionrequired

CormetU TrackCormet DHBBracket

CormetC Stud

Detailplan view

Deflection head under beam

UT52/R CormetU Track

MFC2330Cormet Anglefixed to steel

Outer layerLafarge Firecheck

wallboard

Inner layerLafarge dBcheck

wallboard

Cormet U Track Deep Flange


MFC2330Cormet Angle

CS50/RCormetC Studs

Insulation andwallboards as specified

LafargeFirecheckwallboard

150m

m

FS90/W Flat Strap orMFIX Fixing Channel

DeepFlange UTrack studassembly Cormet

C StudScrew fix withWafer Headscrews at 150mmcentres ( 300mmstitch pattern)

Metal Angle

MFC2330 Metal Angle

FS90/W Flat Strap orMFIX Fixing Channel


144



Floor details

Twin frame separating wall to concrete floorwith screed

Studs, wallboard andinsulation as specified

Cormet U Track asspecified


Screed on concretefloor

Separating wall with timber sole plate

Studs, wallboardand insulation asspecified


Floating screedon resilient layer

Timber sole platesame depth asscreed

Fire stop tocavity betweenfloor slabs

DPC

Expansion joint inscreed or fill cavitywith LafargeIntumescentAcoustic Sealant

Internal partition to concrete floor with screed



Lafarge Acoustic TapeRAFT50


Screed onconcrete floor

DPC

Partition with timber sole plate

Studs, wallboardand insulation as

specified



Timber soleplate same

depth as screed



145

3

Twin frame separating wall with floating screed


Cormet U Track asspecified fixed toconcrete slab


Twin frame separating wall with floating timber floor



Floatingtimberfloor

LafargeAcousticTape RAFT50pinned toend of floordeck

Internal partition on floating screed


Cormet U Track asspecified fixed to

screed



Internal partition on floating timber floor

Studs, wallboardand insulation as

specified



Floating timberdeck

Timber acousticbattens directlybelow partition

146



Baffle details

300min

300min

Varies

Baffle detail in twin stud wall:

elevation

C studs at 600mm centres

Metal switch/socket back boxes

Floor track

150 150Service outlets

If services are to be installed in highperformance partitions it is essentialto maintain the fire and acousticperformance of the partition system.

Service outlets should be offset sothat they do not lie back-to-back.Use Cormet Fixing Channel ornoggings to support outlets asnecessary, and seal around themwith Lafarge Intumescent AcousticSealant. To maintain fireperformance, form a baffle with15mm Lafarge Firecheck wallboardextending at least 300mm aboveand below the outlets and securedto noggings in the centre of thecavity.

A baffle box is required even wherethere is a box on one side only.

60 minute baffle in twin wall (section and plan)

120 minute baffle in twin wall (section and plan)

15mm Lafarge Firecheck wallboard taken down to floor level

Nogging to carry capping board Services box Wallboards as specified

Nogging to carry capping boards Services box Wallboards as specified

2x15mm Lafarge Firecheck wallboards taken down to floor level

Wallboards as specified



147

3

15mm LafargeFirecheck wallboardcap screw fixed to23x30mm CormetMetal Angles

(section)

15mm LafargeFirecheck wallboardbaffle screw fixed toCormet J Track beforeinserting betweenstuds

Service outlet

25mm rock mineralwool packing to void

Continuous baffle in twin wall

Service baffle in partition with 60 minutes fire rating (plan)

Service baffle in staggered I stud partition

Service baffle in Robust Detail E-WS-1 Alternative – service voidformed using Cormet Dryliner

Two layers ofwallboard as specified

C Studs at600mm centres

Edge Channel screw fixed at 300mmcentres through 15mm Firecheckcontinuous infill strip to C Stud

15mm Lafarge Firecheck wallboardbaffle screw fixed to J Track beforeinserting between studs

Serviceoutlet

Rock mineral woolpacking to void

150mm min


Continuous 15mm Lafarge Firecheckwallboard full height, full width

Glass mineral wool

`Plastic backboxes are allowed where baffleis continuous

Wallboardas specified

Rock mineral wool packing the void

15mm Lafarge Firecheck wallboard fixed toCormet Fixing Channel


CormetI Studs

Steelsocket box

Plywoodpacker

25mm glass mineral wool, density 16 kg/m2

2x12.5mm LafargeFirecheck wallboard

Cormet Metal AngleMFC2330


Cormet Drylinersystem used to

create services void

Baffle details

Metal Angle with short leg to void

148



Service and duct penetrations

Pipe penetration <50mm


Noggings top and bottomformed from Cormet U Track

Cable tray penetration through non fire ratedpartition (elevation and plan)

Outer extent of 15mmLafarge Firecheck patress -patress formed in two halves

Centre joint of patress andjunctions between patress andcable tray sealed with LafargeIntumescent Acoustic Sealant

Cable tray supportedfrom structure both sides

100mm minoverlap

150mm aroundpenetration

Cable tray

Insulation asspecified in partition

Cable tray penetration through fire ratedpartition (elevation and plan)




Cable tray supportedfrom structure both sides

100mm minoverlap


Cable tray

Void filled withrock mineral wool

Fire penetrations

Integrity of penetrations to be maintained by others.



149

3

Service and duct penetrations


Multiple pipe penetration through non fire ratedpartition (elevation and plan)



Pipes supported fromstructure both sides ofpartition

100mm minoverlap


Insulation asspecified in partition

Multiple pipe penetration through fire ratedpartition (elevation and plan)




100mm minoverlap



Pipes supported fromstructure both sides ofpartition

Duct penetration over 600mm wide through fire rated partition (section and plan)


Extra stud installed where M&E permits

100mm minoverlap



Outer extent of15mm Lafarge

Firecheck patress -patress formed in

two halves

Centre joint ofpatress and junctionsbetween patress and

cable tray sealed withLafarge Intumescent

Acoustic Sealant

Strips of board as required

Fire penetrations

Integrity ofpenetrations to be maintainedby others.

150



Dampers

Damper installation less than 500mm wide

15mm Lafarge Firecheck or15mm Megadeco wallboard

10mm gap caulked withLafarge IntumescentAcoustic Sealant

Rock mineral woolpacked around damper

Glass mineral wool

Cormet U Track

Cormet C Stud

Cormet U Track

Damper installation over 500mm wide

Cormet C Stud

Boxed stud inCormet UXT Track

Boxed CormetC Stud

600mm 600mm



Fire penetrations

Integrity of penetrations to be maintained by others.



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3

Door frame details

Cormet C Stud as specifiedwith timber insert

Lafarge wallboard as specified

Door frame detail showing timber infill

Fire door frame

Cormet C Stud as specified


Door frame

Timber head to frame

Insulation as specified


Cormet C Stud as specified


Door frame

Timber head to frame


Notes:

At the head, Cormet U Track is cut and bentto extend 450mm down the face of thestuds and fixed twice to each side.

Head detail

Section AA

A

A

Base detail

150mm

Heavy duty fire door frame in single boarded partition

Boxed Cormet C Studs asspecified with full heighttimber insert or single ‘Y’gauge C stud with timberinsert


Fire door frame


Intumescent seal strip insert

Heavy duty fire door frame in double boarded partition


Fire door frame


Boxed Cormet C Studs asspecified with full heighttimber insert or single ‘Y’gauge C stud with timberinsert

Intumescent seal strip insert

75x50mm timber infill to90mm Cormet C Stud

152



Boxing and Splicing studs

Boxed studs

Cormet C Studs may be boxedtogether to give partitions ofgreater rigidity and height and toprovide support at doorways. Thebearing faces of the Cormet C Studsare asymmetrical (36mm and 34mm)to allow for boxing. Nest alternateshort and long faces and snaptogether.

To avoid bulging track leave 50mmboth ends as single stud.

Cormet C Studswith 600mmoverlap (Note: if thepartition layoutexceeds 4 metres,the overlapshould beincreased to1000mm)

Wafer Head screws at150mm centres on bothflanges

Splicedstuds

Boxedstuds

Column in party wall

2x15mm LafargeFirecheck wallboard


Lafarge AcousticTape RAFT50

Lafarge AcousticTape RAFT50

Structuralsteel column

25mm glass mineralwool, density 19.5 kg/m2



153

3

Movement joints

Movement Control Joint 30 minute fire rating

Movement Control Joint 60 minute fire rating

Two layers 15mm LafargeFirecheck wallboard

Cormet MovementControl Joint

15mm Lafarge Firecheckwallboard

Cormet MovementControl Joint

Rock mineral wool tofill void

Cormet C StudCormet C Stud

Two layers 12.5mm LafargedBcheck wallboard

10mm

Table 3.20 Wall grades by categories of duty

BS 5234 : Part 2 : 1992Grade Category of duty Examples

LIGHT LD Adjacent space only accessible to DomesticDUTY persons with high incentive to accommodation

exercise care. Small chance ofaccident occurringor of misuse.

MEDIUM MD Adjacent space moderately used OfficeDUTY primarily by persons with some accommodation

incentive to exercise care. Somechance of accident occurringand of misuse.

HEAVY HD Adjacent space frequently used PublicDUTY by public and others with little circulation areas

incentive to exercise care.Chances of accident occurring Industrial areasand of misuse.

SEVERE SD Adjacent space intensively used MajorDUTY by public and others with little circulation areas

incentive to exercise care.Prone to vandalism and Heavy Industrial areasabnormally rough use.

12.5mm Lafarge dBcheckwallboard

15mm Lafarge Firecheckwallboard

Movement control joints forpartitions

Movement control joints may berequired to relieve normal structuralmovement without loading thepartition. Movement control jointsare required in partitions at intervalsnot exceeding 10 metres, where thepartition crosses or abuts astructural movement joint, andwhere partitions of dissimilarmaterials meet in the same plane.

At movement joints, leave a 12.5mmgap in the Cormet U Tracks at headand base. Fix a Cormet C Stud onone side, 10mm from the gap, andline the web with two layers of15mm Lafarge Firecheck wallboards.Place another stud, web facing webon the opposite side of the gap, asshown. Board the partition, leavinga continuous 12.5mm gap betweenboards along the line of themovement joint.

Cut Cormet Movement Control Jointto length; butt joint lengths end toend where necessary. Attach to theplasterboard surface with 13mmgalvanised or sherardized or zincelectro-plated staples at 150mmcentres. Apply Lafarge Fast Set intwo coats, feathering out the edgesof the second coat. After finishing,remove the masking strip from thecentre of the joint.

Wind loading

Cormet Metal Stud Partitions arenon-loadbearing but can accept adegree of wind loading, for examplewhen used in buildings with large ormultiple external doors. Informationcan be provided on specifications tosuit individual requirements,including the provision of deflectionheads. As a guide, a 7.6m highpartition consisting of 146mmCormet C Studs with two layers of12.5mm Lafarge dBcheck wallboardresists a pressure of 200N/m2, with adeflection limit of L/240 (where L isthe partition height in mm)

Electrical services

The installation of electrical servicesshould be carried out in accordancewith the recommendations of theInstitution of Electrical Engineers.The cut-outs in the studs can beused for routing electrical and othersmall services. Cables should beprotected by conduit or othersuitable precautions taken toprevent abrasion when they passthrough the metal frame.

Earth Bonding

The electrical installation should becarried out in accordance with theI.E.E. Wiring Regulations and theadvice of the National InspectionCouncil for Electrical InstallationContracting (NICEIC) should besought.

154



Minimum 300mm straightsection with Cormet C Studsat 150mm centres at eachend of curve

Cormet Flex Track formedas shown opposite(ceiling track similarly)

Inner layer of plasterboardfixed to each stud at

150mm centres

Outer layer ofplasterboard applied

with long edgeshorizontal, fixed to

each stud at 150mmcentres

Curved partitionCurved Metal StudPartitionsThe versatility and strength ofCormet C Studs enables curvedpartitions to be easily constructed,to create flowing surfaces thatoffset flat wall areas.

To achieve smooth curves, studs areused at close centres, and theplasterboard is wetted beforeapplication with long edgeshorizontal.

Curving plasterboard

Most plasterboards can be curvedwhen wetted. Lafarge Contourwallboard however can be curved tosimilar radii when dry by fixing thewallboard directly to the supportingframe. Curves of a tighter radius canbe obtained by using LafargeContour wallboard in a wettedform. Lafarge Contour wallboardcan be curved in either direction andto a minimum radius of 600mm. See table 3.21.

Curved partitions

FS90/W Flat Strap to supportjoints in layer of wallboard



155

3

Table 3.22 Cormet Flex TrackLafarge Metal Dimensions LengthCode Thickness (mm) (mm) (mm)

MFLEX 0.7 30 x 23 3000

Table 3.21 Bending radii and stud centresRadius Stud centres (mm)(mm) 6mm Contour 9.5mm 12.5mm 15.0mm

wallboard plasterboard plasterboard plasterboard

600 –900 150w – – –

900 –1000 200d 150w – –

1000 –1500 200d 200w 150w –

1500 –2000 200d 250w 200w –

2000 –2500 200d 300w 200w 150w

2500 –3000 250d 350w 300w 200w

3000 –4000 300d 450w 400w 200w

4000 + 300d 450w 500w 350w

w = wetted

d = dry

Pre-cut at 50mm centres to allow curves ofminimum radius of 600mm

Flex Track

Board wetting

Thoroughly wet the side to becompressed of each plasterboardsheet using a brush or roller. Do notwet the opposite side. Allow theboards to stand for at least onehour before installation.

When bending to a tight radiusensure that the wetting processsoftens the core of the wallboard.

System assembly

Cormet Flex Track

Cormet Flex Track is designed toallow easy construction of curvedwalls, partitions and ceilings.

It is a galvanised 0.7mm metal angleused in place of standard metalangle or standard Cormet U Track. It is supplied pre-cut to allow aminimum radius of 600mm to beachieved.

Metal stud framing

Mark out the curves on the floorand ceiling. Curve width should be2mm greater than the width of theCormet C Stud.

Fix the Flex Track to the floor andceiling at 300mm centres along bothlines of the marked curve.

Insert Cormet C Studs into the trackaround the curve at centres shownin table 3.21. Where multiple boardlayers are installed, it may benecessary to insert extra studs at theboard edges to account for thedifference which arises between theinner and outer board radii.

Boarding

Start boarding at one end. Buttplasterboards firmly against theceiling. Screw fix the first stud,fixing from the midpoint of theboard, at 150mm centres, asillustrated. Refer to table 3.25 forrecommended screw lengths.Carefully screw the board to theframing, stud by stud, pushing theboard against the framing.

Ensure that the plasterboards arecompletely dry before jointing andmaking cut-outs for services.

On double layer boarding systems,the horizontal joint of the outerlayer of wallboard may besupported by the use of FS50/R orFS90/W Cormet Flat Strap fixedbetween wallboard layers ifrequired.

Jointing

Stagger all joints between layers. All joints should be taped and filledin accordance with LafargePlasterboard’s instructions. SeeSection 7.

156



Fixing to Lafarge wallboards

Drywall constructions canaccommodate most fixturesproviding the appropriate fixings or fixing provisions are used.

Where the locations of fixtures areknown before the construction iscommenced, fixing provisions can be designed and installed into theconstruction.

Alternatively, fixtures can beattached directly to the finished drylinings using the recommendedfixings given in table 3.23.

For the medium and heavyweightfixings in table 3.23 it is veryimportant that the plasterboard iscarefully and accurately drilled andthat all fixings are installed as perthe manufacturer’s instructions.Holes should never be punched. On the bigger fixtures, it is necessaryto use a minimum of four fixings.

Table 3.23 FixturesFixture load Examples Fixing provisions* Notes

Very light Small pictures Picture hooks

Wood screws

Light Mirrors Spit Driva LD See manufacturer’s

Floor cupboards Spit Driva original literature for

Light fittings Spit Diva PlusMaximum loadings

Coat hooks Fixing channel

Medium Radiators Spit Spring Toggle See manufacturer’s

Wall cupboards Spit Hollow Anchor literature for

Water heaters Spit SatelisMaximum loadings

Sanitary ware Fixing Channel

Timber battens

Boxed studs

Extra studs

Heavy Wall mounted sanitary ware See diagrams on opposite page

Large wall cupboards

Heavy shelving

* See manufacturer’s literature for maximum loadings

Spit Driva LD

Spit Driva Original

Spit Spring Toggle

Fixtures

Spit Driva Plus

Spit Hollow Wall Anchor

Spit Satelis



157

3

Foe medium weight items

Lafarge Fixing Channel or FS90/WFlat Strap secured to studs withwafer head screws

For heavy weight items

Timber support

Vertical timber framingas required

Floor channel

300mm length ofCormet stud screwfixed back to back tomain stud with LafargeSelf-Tapping Screws

Horizontal nogging and centralstud of sawn softwood to suit sizeof Cormet metal studs and notchedinto them and fixed through ends

Plywood support

18mm plywood600x300mm

CormetMetalAngle

Rebate onplywood

Plywood patress

12mm plywood560x1200mm

60mm U-track to secureback of plywood

Drywalladhesive dabs

Drywall screws 100mmfrom stud centres

600mm

158



Tips on installation

Board fixingFor fixing to timber, use nails orscrews as specified in tables 8.4 or8.9. For fixing to metal, use screwsas specified in table 8.5.

Lafarge Drywall Screws

Bugle head screws for fixingplasterboard to metal or timberstuds. Lafarge Drywall Screws havea unique head design to eliminatepaper burrs and provide a flushfinish. Extra-sharp points and high-grip threads result in fastpenetration through theplasterboard and stud. The screwsare black phosphate coated andlightly oiled for protection againstcorrosion.

Lafarge Drywall High Thread Screwsare used for attaching plasterboardto timber framework.

Lafarge Drywall Self Tapping Screwsare for light gauge metal up to0.7mm thick.

Lafarge Drywall Self Drilling Screwsare for heavy gauge metal from0.7mm to approximately 2.0mm thick.

Installation

Drive Screws:

• at least 10mm in from paper-bound edges of plasterboard

• at least 13mm in from cut edgesof plasterboard

• at least 6mm in from edges oftimber framing

• at least 3mm in from the edges of metal framing.

Screw spacing: Partitions, maximum300mm. Ceilings, maximum 230mmin the field of the plasterboard,150mm at cut edges and perimeter.Linings, maximum 300mm.

Table 8.5 Recommended naillengths for timber framingConstruction Plasterboard Nail Length

thickness (mm) (mm)


15.0 40

19.0 50


12.5 + 19.0 65

15.0 + 15.0 65

Drive screws squarely through boardand into framing until screw head isjust recessed. Spot screw heads withLafarge jointing compound toprovide a flush surface.

Lafarge Pan Head Screws andLafarge Wafer Head Screws are usedprimarily for fixing Cormet metalstuds and other Cormet metalframing components together: self-tapping for light gauge metal andself-drilling for heavy gauge metal.

Lafarge Toughcheck Screws are usedfor fixing Lafarge Toughcheckwallboard.

Table 8.4 Recommended screwlengths*Construction Plasterboard Screw

thickness (mm) length (mm)

Timber framing 6 32


15.0 38

19.0 41

Timber framing 6 + 6 38


12.5 + 19.0 63

15.0 + 15.0 63

Metal framing 6 25


15.0 32

19.0 38

25.0 41

Metal framing 6 + 6 25

12.5 + 12.5 38

15.0 + 15.0 44

12.5 + 19.0 51

25.0 + 12.5 57

25.0 + 25.0 63

* Except for fixing to Cormet metal furring wall channelsand Resilient Bar. See table 4.16 on page 184.

Lafarge Checkpoint Screws are usedfor fixing Lafarge Moisturecheck,dBcheck and Firecheck wallboards to 0.5mm light gauge Cormet metalstuds.

Lafarge Drywall Nails

Zinc-coated ring shanked DrywallNails with a thin wide head formaximum board holding withoutpaper breakage. The long, sharpdiamond point ensures ease offixing. Complies with BS 8212: 1995for fixing plasterboard to timber.

Installation

Drive nails:

• at least 10mm in from paper-bound edges of plasterboard

• at least 13mm in from cut edgesof plasterboard

• at least 6mm in from edges oftimber framing.

Nail spacing: maximum 150mm (all systems).

Drive nails squarely throughplasterboard and into timber framingusing a dimple head drywall hammeruntil the nail head is just recessed.Spot nail heads with Lafargejointing compound to provide a flushsurface.

3 10 310

Up to 3mmgap betweenplasterboards

Fixing position at bound edgesof boards

3 13 310

Fixing positions at bound edge/cutedge joint

3 13 313

Fixing positions at cut edges ofboards

Minimum3mm fromedge ofmetalframe

Minimum 10mmfrom edge ofwallboard









159

3

Tiling

Tiling is suitable for a wide range ofapplications with varying conditions,ranging from domestic splashbacksto shower cubicles in publicbuildings.

Ceramic tiling should be applied toLafarge Standard wallboard orLafarge Moisturecheck wallboarddepending on the severity of theconditions. Lafarge Standardwallboard may be used as the basefor tiling in areas such assplashbacks behind kitchen sinks andwash hand basins. In other areaswhere there is likely to be moresplashing of water on the surface,e.g. showers, it is preferable to useLafarge Moisturecheck wallboard. IfLafarge Standard wallboard is usedit should be treated on the facewith two coats of Lafarge DrywallSealer.

Where the tiling is to cover theentire drylined wall surface, squareedge boards may be used. Where anarea of the drylining will remainuntiled, taper edge boards shouldbe used so that flush joints can beformed in the exposed areas; in thiscase the concealed joints should befilled with a waterproof ceramic tileadhesive.

Care should be taken to ensure thatthe framing members and liningboards offer adequate support toprevent flexing, particularly forpartitions which may be tiled on oneside only. Tiled areas not extendingdown to the floor should beprovided with horizontal supports atthe base of the tiling.

Additional support requirements aregiven in table 3.26. Supports forbaths, basins and other plumbingfixtures must be providedindependently of the plasterboard.

It is essential that detailing atjunctions, angles and perimeters isdesigned to prevent moisturepenetration. Seal around pipes,baths, shower fittings, openings andoutlets with a waterproof siliconesealant.

Recommendations in table 3.26apply to the use of tiles up to12.5mm thick with a maximumweight of 32 kg/m2, fixed inaccordance with BS 6431: Part 9,using a thin-bed adhesive (nominalthickness 3mm).**

Drylining systems using LafargeBonding Compound in theirconstruction should be allowed 10days to achieve their full strengthbefore tiling.

Repairs

Minor damage to plasterboard maybe repaired by filling with LafargeFast Set and sanding smooth. Areasof damage too large for fillingshould be repaired by one of themethods below.

Cut out a rectangular piece of theboarding around the damaged areausing a fine-toothed keyhole saw.Bevel the edges of the hole inwardsat 45º with a rasp or sanding block.Cut a piece of board to the samesize as the hole and bevel the edgesto an exact fit. Apply Lafarge FastSet to the edges of the hole and fitthe patch piece in place using

Lafarge Patching Tape; leave to setfor 1 hour. Finish around the patchas described under Jointing above.

If necessary, bond a strip ofplasterboard behind the hole toprovide extra support beforeinserting the patch piece.

For larger repairs, cut a rectangularpiece of plasterboard 50mm largerthan the hole or damaged area.Place it over the hole and mark itsposition. Cut through the damagedboard along the diagonals of themarked rectangle with a fine-toothed keyhole saw; then cutthrough the paper facing aroundthe rectangle with a sharp knife,break away and remove the cutpieces of the board.

Cut two backing pieces ofplasterboard and bond to the backof the boarding using Lafarge FastSet on each side of the hole; allowto harden for 1 hour.

Apply Lafarge Fast Set to thebacking pieces and fit the patchpiece of plasterboard into the holeusing Lafarge Patching Tape; leaveto set for 1 hour. Finish around thepatch as described under Jointingabove.

Table 3.26 Plasterboard to receive ceramic tiling (BS 8212)System Board Support Additional support Maximum

thickness centres tiling height(mm) (mm) (m)

Drylining Direct Bond 12.5 450* Horizontal dabs at 1/3 centres in height 3.6

Lafarge Dryliner 12.5 400 – 3.6

Independent 70mm I Studs 2 x 12.5 400 Mid-point support 3.0

Partitions Laminated 50, 63 – None 2.4

55, 70 – None 2.6

Timber 12.5 400 – 450 None 3.0

12.5 600 Timber noggings at 600mm vertical centres 2.4

Cormet metal stud 50mm studs 2 x 12.5 400 None 3.6

70mm studs 2 x 12.5 400 None 3.6

146mm studs 2 x 12.5 600 Additional studs at 300mm centres up to tile height

*Bonding compound dab row centres

**Full specification for ceramic tiling to plasterboard is available from the Tile Association, Forum Court, 83 Copers Road, Beckenham, Kent, BR3 1NR

Tiling onto LafargeWallboard

160

P A R T I T I O N SWHAT CAN GO WRONG CHECKLIST


Partitions Checklist

Items to check

1. Has sealant been applied to the back of the steel U channels or timberframing before fixing to the wall floor and ceiling?This sealant has the vital role of filling any gaps due to the undulations in thestructure and thus preventing unwanted airpaths.

2. Is the mineral wool the correct thickness and density?

Inadequate thickness and density will reduce the acoustic performance.

3. Is the mineral wool quilt installed with no gaps at the joints and butted uptightly at the perimeter?

Gaps will allow the sound to travel right through rather than being partiallyabsorbed as it passes through the mineral wool.

4. Where Cormet Resilient Bars are used do the wallboard screws come intocontact with the main studs?

To check this, the side of the partition with the Resilient Bar must be boarded outfirst, so a visual check can be made before the other side is boarded out.

5. Are all joints in double boarded applications staggered?

Plan the board layout to avoid both layers of board having a vertical joint at thesame stud.

6. Is the gap at the base of the wallboard filled with Lafarge AcousticSealant?

If left unfilled this will be a weak point for the sound to pass through.

7. Has the correct type of wallboard been used?

The wrong type of wallboard may adversely affect performance. Lafarge wallboardsare colour coded to make it easier for the correct board to be identified.

8. Have electrical sockets and other services been installed correctly?

Wallboard baffles must be built behind the electrical boxes to maintain the soundperformance of the partition.

Yes No Date completed

(✓) (✓)