BS1369.1-1987

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BRITISH STANDARD BS 1369-1:1987

Steel lathing forinternal plastering and

external rendering

Part 1: Specification for expanded metaland ribbed lathing

UDC [692.528 + 691 417.4]:[691.75 + 693.548.8]:693.613.8.621.625

opyright British Standards Institutionovided by IHS under license with BSI

Not for Resaleo reproduction or networking permitted without license from IHS

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BS 1369-1:1987

This British Standard, havingbeen prepared under thedirection of the Iron and Steel

Standards Committee, waspublished under theauthority of the Board of BSIand comesinto effect on23 December 1987

BSI 03-1999

First published, as BS 1369,July 1947

First revision December 1987

The following BSI referencesrelate to the work on this

standard:Committee reference ISM/9

Draft for comment 86/43984 DC

ISBN 0 580 16289 3

Committees responsible for thisBritish Standard

The preparation of this British Standard was entrusted by the Iron and Steel

Standards Committee (ISM/-) to Technical Committee ISM/9 upon which thefollowing bodies were represented:

British Independent Steel Producers Association

British Precast Concrete Federation Ltd.

British Reinforcement Manufacturers Association

British Steel Industry

British Steel Industry (Wire Section)

Cement and Concrete Association

Concrete Society

County Surveyors Society

Department of the Environment (Property Services Agency)Department of Transport (Highways)

Electricity Supply Industry in England and Wales

Federation of Civil Engineering Contractors

High Yield Bar Development Association

Institution of Civil Engineers

Institution of Structural Engineers

UK Certification Authority Reinforcing Steels

Amendments issued since publication

Amd. No. Date of issue Comments



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BS 1369-1:1987

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Contents

Page

Committees responsible Inside front cover

Foreword ii1 Scope 1

2 Material 1

3 Design 1

4 Dimensions and tolerances 1

5 Marking 2

Figure 1 Measurement of aperture for expanded metal lath 2

Figure 2 Measurement of aperture for ribbed lath 2

Table 1 Designation of lath for internal application 1

Table 2 Designation of lath for external rendering 1

Publications referred to Inside back cover



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Foreword

This Part of BS 1369 has been prepared under the direction of the Iron and SteelStandards Committee and is a revision of BS 1369:1947, which is withdrawn.

This revision updates and metricates the previous edition to reflect changes in themanufacturing processes and material selection. The major change is thatexpanded metal lathing is now produced only from zinc coated or stainless steelsheet or strip.

BS 1369-2, which is in preparation, will specify requirements for lathingproduced from wire mesh, which was not included in BS 1369:1947.

For corrosive environments it is recommended that a stainless steel lath shouldbe selected.

A British Standard does not purport to include all the necessary provisions of acontract. Users of British Standards are responsible for their correct application.

Compliance with a British Standard does not of itself confer immunityfrom legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii,pages 1 and 2, an inside back cover and a back cover.

This standard has been updated (see copyright date) and may have hadamendments incorporated. This will be indicated in the amendment table onthe inside front cover.



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BS 1369-1:1987

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1 Scope

This Part of BS 1369 specifies steel type,

designation, dimensions and tolerances for steellathing for internal plastering and externalrendering.

NOTE The titles of the publications referred to in this standardare listed on the inside back cover.

2 Material

2.1 Zinc coated steel

Zinc coated lath shall be manufactured from zinccoated steel complying with BS 2989 with a coatingrequirement of at least grade G275 for internalplastering and at least grade G450 for external

rendering. The steel shall be selected from theforming grades Z1 to Z5.

2.2 Stainless steel

Stainless steel lath shall be manufactured fromaustenitic stainless steel that has a corrosionresistance at least equal to that ofBS 1449-2: grade 304S15.

NOTE Stainless steel lath is suitable for both internal andexternal applications.

3 Design

The designation and types of lath shall be as given

in Table 1 and Table 2.NOTE When ordering to this Part of BS 1369, the purchasershould state the specified reference number of the lathingrequired, e.g. BS 1369-1:1987 SRL 2.

4 Dimensions and tolerances

4.1 Sheet size and form

Sheet size shall be specified with the length firstfollowed by the width and the nominal size shallbe 2 500 mm 700 mm. The minimum height ofribs shall be 7 mm in ribbed lath and 5 mm incorrugated lath. Ribbed lath shall be formed with arib on each longitudinal edge and with ribs spacedat maximum intervals of 110 mm.

4.2 Material thickness

The minimum material thickness for both zinccoated and stainless steel lath shall be 0.3 mm.

4.3 Aperture size

4.3.1 Expanded metal lath.The aperture, whenmeasured as illustrated in Figure 1, shall be aminimum of 14 mm in the long way of mesh (LWM)direction and a minimum of 5 mm in the short wayof mesh (SWM) direction.

Table 1 Designation of lath for internalapplication

Table 2 Designation of lath for external

rendering

Referencenumbera

Mass persquaremetre

Type

kg

L 1 0.89 Expanded metal lathG275






CL 1 0.89 Corrugated expandedmetal lath G275



CL 4 1.77 Corrugated expanded

metal lath G275CL 5 1.84 Corrugated expanded

metal lath G275

RL 1 1.33 Ribbed lath G275





a L = lath; CL = corrugated lath; RL = ribbed lath.

Reference

numberaMass persquaremetre

Type

kg

SL 1 1.09 Stainless steel expandedmetal lath

SRL 1 1.35 Stainless steel ribbedlath

SRL 2 1.84 Stainless steel ribbedlath


a SL = stainless steel lath; SRL = stainless steel ribbed lath;

RL = ribbed lath.



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4.3.2 Ribbed lath.The aperture, when measured asillustrated in Figure 2, shall be a minimum of 9 mmin the LWM direction and a minimum of 5 mm inthe SWM direction.

NOTE The dimensions are for clear aperture and not centre tocentre of the strands.

4.4 Mass and tolerance on mass

The mass per square metre of each lath shall be asgiven in Table 1, subject to a tolerance of 15 %.

4.5 Tolerance on sheet width for expanded andcorrugated lath

A tolerance on sheet width of 5 mm shall apply.

4.6 Tolerance on sheet width and centre of ribto centre of rib dimensions for ribbed lath

A tolerance on sheet width of mm shall apply.

A tolerance on centre to centre of rib dimensionsof shall apply.

5 Marking

For each consignment of lath the manufacturershall attach securely an identification label bearingthe following information:

a) the manufacturers name or trade mark;b) the number and date of this British Standard.i.e. BS 1369-1:19871);

c) either the specified reference number or anumber that can be related to the specifiedreference number;

d) the order number.

Figure 1 Measurement of aperture for

expanded metal lath

1) Marking BS 1369-1:1987 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or

on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore

solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party certification of

conformity, which may also be desirable.

+ 0 15

+ 0 2

Figure 2 Measurement of aperture for ribbed lath



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Publications referred to

BS 1449, Steel plate, sheet and strip.

BS 1449-2, Specification for stainless and heat-resisting steel plate, sheet and strip.

BS 2989, Specification for continuously hot-dip zinc coated and iron-zinc alloy coated steel: wide strip,sheet/plate and slit wide strip.



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Documents

BS1369.1-1987