Sengkang N2 C34 S73

BSS S73 73-1 of 73-57

Sengkang N2 C34 SS 73 (LMF)

SECTION 73

73.0 SUPPLEMENTARY SPECIFICATIONS FOR PART A - BUILDING WORKS AT

SENGKANG NEIGHBOURDHOOD 2 CONTRACT 34 (TOTAL 424 DWELLING UNITS)

73.1 TESTING OF MATERIAL 73.1.1 Requirement

The Contractor shall carry out testing of materials for the Works to ensure compliance with the requirements stipulated under the Contract. Subject to sub-clauses 73.1.3, 73.1.4 and 73.1.6 specified hereunder, the Contractor shall only be required to bear the cost and expense for carrying out the testing of materials listed in the Schedule of Material Tests provided hereunder. As and when directed by the SO Rep, material testing shall be carried out at the Site or at SAC-SINGLAS laboratories or at HDB Prefabrication Technology Centre or at other laboratories as approved or at the place of manufacture or fabrication, all as specified for the respective materials. The Contractor shall ensure timely delivery of materials having regard to the programme for the Works submitted and the testing of materials to be carried out.

73.1.2 Tests At HDB Prefabrication Technology Centre

The following tests shall be conducted at the HDB Prefabrication Technology Centre. The Contractor shall be charged at the rates as specified below:

Type of Test Unit Rate ($) Cube compression test Per cube 2.50 Steel bar tensile test Per piece 40.00 Welded mesh tensile test Per piece 60.00 Cement sample test Per sample 420.00 Sand sample test Per sample 210.00 Coarse aggregates sample test Per sample 400.00 Windsor probe test Per test 200.00 Core test Per sample 250.00 Magnetic particle flaw detection test Per point 30.00 Load test for horizontal member scaffold

frame Per test 550.00

Load test for vertical member scaffold frame: Per test 550.00

Tensile test for scaffold wall ties Per test 225.00 Compression test for scaffold wall ties Per test 225.00 Deflection and bending test for metal

working plaform Per test 550.00

Load test on metal working plaform clamp Per test 550.00

Test for metal prop of frame Per test 550.00

BSS S73 73-2 of 73-57


73.1.2 Tests At HDB Prefabrication Technology Centre

For the avoidance of doubt, in addition to paying the rates specified above, all other costs and expenses for such tests shall also be borne by the Contractor

73.1.3 Further Testing Upon Failure

Any material test that fails shall be considered not to have fulfilled the requirements under the Schedule of Material Tests. In that event, the SO Rep may, without prejudice to his other rights under the Contract, order such further test as he deems necessary, all at the cost and expense of the Contractor. The Contractor shall bear the cost and expense for all failed tests.

73.1.4 Additional Tests

The SO Rep may also order additional material tests over and above those specified in the Schedule of Material Tests. The cost and expense for carrying out such additional material tests shall be borne by the Employer, provided that such tests pass the requirements stipulated under the Contract. The Contractor shall bear the cost and expense of any additional test that fails.

73.1.5 Test Not Ordered

In the event any test listed in the Schedule of Material Tests is not carried out, there shall be no cost recovery from the Contractor.

73.1.6 Functional And Other Tests The above provisions shall have application to testing of materials only. Nothing

therein shall in any way affect, vary or relieve the Contractor's obligation to carry out and bear all costs and expenses of other tests which are not material tests, required under the Contract, including but not limited to loading tests, concrete core tests, waterproofing tests, watertightness tests, water stagnation tests etc.

BSS S73 73-3 of 73-57


73.1 TESTING OF MATERIAL (CONT'D)

SCHEDULE OF MATERIAL TESTS

S/N TYPE OF MATERIAL TO BE TESTED

TYPE OF TEST TO BE CARRIED OUT

FREQUENCY OF TEST FOR EACH TYPE

OF TEST

NO. OF SAMPLES PER TEST

1

Galvanised metal prop (for multi-storey car park/garage)

Stripping

1 test per source.

3 samples per test.

2

Scaffold frame

a) Load test on horizontal member b) Load test on vertical member c) Material test - tensile strength

a) 1 test. b) 1 test. c) 1 test.

a) 3 samples. b) 3 samples. c) 1 sample.

3

Scaffold wall ties

a) Tensile test b) Compression test

a) 1 test. b) 1 test.

a) 3 samples. b) 3 samples.

4

Metal working platform

a) Deflection & bending test b) Load test on clamp and hook


a) 3 samples. b) 3 samples.

5

Metal props of frames

Load test to SS 280

1 test per type.

1 sample per test.

6

Chemical used for pre-treatment of soil for protection of building against subterranean termites

Concentration of chemical used

a) Building block (excluding multi- storey carpark/ garage, link building and linkways) : i) 2 tests per

building block for ground slab;

ii) 2 tests per building block for apron.

b) Multi-storey carpark/garage : i) 4 tests for

ground slab; ii) 2 tests for apron. c) Link building including linkways: - 2 tests for ground slab.

) ) ) ) ) ) ) ) ) ) ) 1 sample ) per test. ) ) ) ) ) ) ) ) ) ) )

BSS S73 73-4 of 73-57







OF TEST


7

Non-HDB metalforms

a) Reduced section tensile

test b) Dimension test

a) 1 test b) 2 tests per building block.for buildings up to 20 storeys; 3 tests per building block for buildings up to 30 storeys; 4 tests per building blocks for buildings up to 40 storeys.

a) 5 samples per

test. b) 17 samples per test

8

150 mm cube mould

Dimensional tolerance

1 test per source.

1 sample per test.

9

Concrete

a) Slump b) Compression

a) As and when directed. b) i) For sampling on Site: 1 test for every 40 m3 or part thereof, of each grade of concrete, subject to a minimum of 1 test for each batch; ii) For sampling at ready mix plant or precast plant: 1 test for every 40 m3 or part thereof, subject to a minimum of 1 test for each batch.

a) 1 sample per test. b) 2 samples per test.

10

Steel reinforcement of diameter 10mm & above

Tensile

2 tests per source.

3 pieces per size per test..

BSS S73 73-5 of 73-57







OF TEST


11

Precast concrete components including staircase, refuse chute, floor plank, sunbreaker, facade, gable end wall, parapet, roof fascia, sunbreaker (ferrocement), and roof slab (ferrocement)

Compression

1 test for every 40 m3 of concrete used or minimum of 1 test for each day of casting if concrete used is less than 40 m3.

4 concrete cubes per test.

12

Homogeneous modular clinker tiles to be incorporated in precast concrete façade

a) Dimensional tolerances; b) Straightness of sides; c) Rectangularity; d) Flatness of surface; e) Surface condition of clinker tiles; f) Water absorption; g) Modulus of Rupture; h) Colour fastness and light fastness; i) Acid resistance and alkali resistance; j) Test for adhesion bond strength between clinker tiles and concrete : i) tensile adhesion strength; ii) shear adhesion strength.

) ) ) ) ) ) ) ) ) ) ) ) ) ) 1 test per colour ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) )

) ) ) ) ) ) ) ) ) ) ) ) ) ) 1 set per ) test ) ) ) ) ) ) ) ) ) ) ) ) ) ) )

13

Load bearing grout and load bearing mortar

Compression

3 tests per grade per casting day.

1 concrete cube per test.

14

Prestressing steel

Yield & Tensile

1 test per source.

3 samples per size per test.

BSS S73 73-6 of 73-57







OF TEST


15

For household shelters, the following shall be tested: (1) Blast door/frame i) Blast door leaf ii) Cathodic electro- deposition primer (where applicable) (2) Shelter enclosure

Cut open the door leaf to check compliance with approved shop Drawings and Specifications. ) a) Adhesion ) (ASTM D3359-87); ) b) Scratch resistance ) (SS5: Part F2); ) c) Pencil hardness ) (ASTM 3363-74); ) d) Dry film thickness ) (SS5:Part B1); ) e) Resistance to ) continuous salt ) spray ) (SS5: Part 32); ) f) Resistance to ) humidity under ) condensation ) condition ) (SS5:Part 14). Air tightness test: At a water pressure level difference of 25 mm, the water pressure drop shall not exceed 20 mm in 45 seconds.

) ) ) ) ) ) ) ) ) ) ) ) 1 test per source ) ) ) ) ) ) ) ) ) ) ) ) ) ) 2 tests ) ) )

) ) ) ) ) ) ) ) ) ) ) ) 1 sample ) per test ) ) ) ) ) ) ) ) ) ) ) ) ) NA ) ) )

16

Sterilization of water tank

a) Bacteriological b) Chemical

) 1 test per tank. )

) 1 sample ) per test.

BSS S73 73-7 of 73-57







OF TEST


17

Precast lightweight concrete partition panel a) Concrete b) Anchor bolt or pin

a) 28 day compressive strength b) Pull-out

a) 1 test per 50 m3 of concrete used for production or minimum of 1 test for each day of casting if concrete used is less than 50 m3. b) 5 tests per building block.

a) 3 concrete cubes per test. b) 1 bolt per test.

18

Modular Common Bricks

a) Width of brick b) Compressive strength c) Water absorption ratio d) Soluble salt content e) Efflorescence

) ) ) 1 test per building ) block. ) ) )

) ) ) 1 set per ) test. ) ) )

19

a) Wall tie system b) Bonding bar system

) Stripping test in ) accordance with ) SS 117; or ISO 2808 ) Method (zinc coating ) of steel particles)

a) 1 test per type of wall tie system. b) 1 test.

a) 2 samples per test. b) 2 samples.

20

Clay roof tiles

a) Permeability b) Transverse breaking strength c) Water absorption

) ) 1 test. ) )

) ) 1 set. ) )

21

Roof bitumen emulsion (after laying)

a) Thickness b) Density

) 1 test per building ) block. )

) 3 samples ) per test. )

BSS S73 73-8 of 73-57







OF TEST


22

Main entrance timber doors

a) Stripping test to check compliance with dimensions and connection details b) Moisture content test to SS CP 1 (1982) c) Test of adhesive to SS 347 (1990)


a) 1 sample. b) 1 sample. c) 1 sample.

23

Timber solid doors for bedrooms

a) Stripping test to check compliance with dimensions and connection details b) Moisture content test to SS CP 1 (1982) c) Test of adhesive to SS 347 (1990)


a) 1 sample. b) 1 sample. c) 1 sample.

24

Weld (for steel structure, except linkways and precinct pavilion)

Either one or a combination of : a) Radiographic b) Ultrasonic c) Penetration d) Magnetic particle

) ) ) 1 test per 10 joints. ) ) )

) ) ) 1 joint per ) test. ) )

25

Steel section and plates

a) Yield b) Tensile c) Notch toughness d) Ductility e) Weldability

) ) ) 1 test per source. ) )

) ) ) 1 sample ) per test. )

26

Galvanised steel section

Stripping

1 test per source.

2 samples per test.

27

Anchor bolt for sun-breaker

Pull-out

5 tests per building block.

1 bolt per test.

BSS S73 73-9 of 73-57







OF TEST


28

Aluminium clothes drying racks and stainless steel railings at recessed area

a) Material composition test for aluminium clothes drying rack b) Material composition test for stainless steel railings


a) 1 sample. b) 1 sample.

29

Pre-packed waterproofing screed

a) Average Compressive

Strength b) Water penetration c) Shrinkage

) ) ) ) 1 test. ) )

) ) ) ) 1 sample. ) )

30

Pre-packed Floor screed

a) Average Compressive

Strength b) Shrinkage

) ) 1 test. ) )

) ) 1 sample. ) )

31

Ceramic floor tiles(common areas and non residential units)

a) Length and width b) Thickness c) Straightness of sides d) Rectangulariy e) Surface flatness (for

non-structured floor tiles)

f) Surface quality g) Water absorption h) Breaking strength i) Modulus of Rupture j) Abrasion resistance k) Staining Test l) Resistance to

household chemicals m) Slip resistance (for

bathrooms and/or toilets only)

n) Colour fastness and light-fastness

o) Reverse staining Test (for glazed tiles only)

) ) ) ) ) 1 test per brand. ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) )

) ) ) ) ) 1 set ) per test. ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) )

BSS S73 73-10 of 73-57







OF TEST


32

Ceramic floor tiles(kitchen,dining, bath/wc and wc)

a) Length and width b) Thickness c) Straightness of

sides d) Rectangulariy e) Surface quality f) Water absorption g) Breaking strength h) Modulus of Rupture i) Abrasion resistance j) Crazing resistance k) Staining Test l) Resistance to

household chemicals

m) Slip resistance(for bathrooms and/or toilets only))

n) Colour fastness and light-fastness 0) Reverse staining Test p) Impact resistance

) ) ) ) ) 1 test per colour. ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) )

) ) ) ) ) 1 set ) per test. ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) )

32

Pre-packed mortar mix

a) Tensile Pull out test b) Tensile Adhesion

strength tests c) Average Shrinkage

) ) ) 3 tests per ) building block. ) )

) ) ) 10 spots ) per test. ) )

33

Pre-packed skimmed coat

a) Tensile Pull out test b) Tensile Adhesion

strength tests c) Average Shrinkage

) ) ) 3 tests per ) building block. ) )

) ) ) 10 spots ) per test. ) )

BSS S73 73-11 of 73-57







OF TEST


34

Pattern colour glazed wall tiles inside dwelling unit.

a) Length and width b) Thickness c) Straightness of sides

d) Rectangularity e) Surface flatness f) Surface quality g) Water absorption h) Breaking strength i) Modulus of Rupture j) Crazing resistance

k) Staining Test l) Resistance to household chemicals

m) Lead and cadmium

Release n) Colour fastness and light fastness

o) Reverse staining test

) ) ) ) ) ) ) 1 test per colour ) ) ) ) ) ) ) ) ) ) ) ) ) )

) ) ) ) ) ) ) 1 set per ) test. ) ) ) ) ) ) ) ) ) ) ) ) )

35

Ceramic wall tiles(common areas and non residential units).

a) Length and width b) Thickness c)Straightness of sides

d) Rectangularity e) Surface flatness f) Surface quality g) Water absorption h) Breaking strength i) Modulus of Rupture j) Crazing resistance

k) Staining Test l) Resistance to household chemicals

n) Colour fastness and light fastness

o) Reverse staining test

) ) ) ) ) 1 test per brand. ) ) ) ) ) ) ) ) ) ) ) ) ) )

) ) ) ) ) 1 set ) per test. ) ) ) ) ) ) ) ) ) ) ) ) )

36

Wall tiling work

Tensile pull-out test

3 tests per building block.

5 spots per test.

BSS S73 73-12 of 73-57







OF TEST


37

Paint (internal)

Dilution

1 test per coat per building block.

1 sample per test.

38

Paint (external)

Dilution

1 test per coat per building block.

1 sample per test.

39

Solvent cement for jointing UPVC pipes and fittings

a) Shear strength b) Film properties c) Long term hydrostatic pressure.

) ) 1 test. ) )

) ) 1 sample. ) )

40

Ductile iron water pipes and ductile iron pipe fittings

Micro structure.

1 test.

1 sample.

41

Stainless steel water pipes

Material composition

1 test.

1 sample.

42

Sterilization of underground water distribution mains

a) Bacteriological b) Chemical

) 1 test per ) underground water ) distribution main.

) 1 sample ) per test. )

43

Galvanised steel gas pipes and fittings

Material composition

1 test.

1 sample.

44

Welding to API gas pipe joints

Radiographic test

100% of joints.

All.

45

Galvanised steel water pipes and fittings for fire fighting installation

a) Material composition b) Weight c) Dimension

) ) 1 test. )

) ) 1 sample. )

46

Tile grout

a) Linear shrinkage b) Water absorption c) Compressive strength d) Tensile strength e) Flexural strength

) ) ) 1 test per type. ) )

) ) ) 1 sample per ) test. )

BSS S73 73-13 of 73-57







OF TEST


47

In-situ concrete strength

a) Core test b) Windsor Probe test

a) 1 test per building block on 1st storey in-situ RC wall . b) 4 tests per building block on 1st storey in-situ RC columns and 1 test per building block on the RC wall where core test is conducted.

a) 1 sample per test. b) 3 samples per test.

48

Coarse Aggregates

a) Sieve analysis b) Relative density c) Bulk density d) Angularity number e) Flakiness index f) Elongation index

) ) ) 2 tests ) ) )

) ) ) 1 sample per ) test ) )

49

Sand

a) Sieve analysis b) Decantation & field settling c) Relative density d) Bulk density

) ) ) 2 tests ) )

50 Laminated safety glass for fixed panel below cill height

a) Impact test b) Boil test c) Overall bow & warp

(flatness) test d) Dimensional, thickness

and squareness test

) ) ) ) ) 1 test ) ) ) )

a) 4 samples b) 3 samples c) 1 sample d) 1 sample

51 Laminated safety glass for shower screen

a) Impact test b) Boil test c) Overall bow & warp

(flatness) test d) Dimensional,

thickness and squareness test

) ) ) ) ) 2 tests; ) (1 test during sample ) unit stage and 1 test ) during construction)

a) 4 samples per test b) 3 samples per test c) 1 sample per test d) 1 sample per test

BSS S73 73-14 of 73-57


73.2 PROVISION OF WARRANTY The Contractor and his Specialist (if applicable) shall be required to provide

warranties for certain specified works and/or materials under the Contract. For the avoidance of doubt, the Contractor and his Specialist (if applicable) shall only be required to provide the following warranties:

Clause

and/or Subclause

No.

Works/Materials To Be Warranted Format

3.16.12

Pre-Treatment Of Soil For Protection Of Buildings Against Subterranean termites

Appendix A1 and/or Appendix A1(TC)

14.3(G)

Complete System Of Waterproofing Treatment And Panel Roofing


23.2.2(e)

External Painting Works


25.12.6

Cast-In-Situ EPDM Rubber Flooring For Children's Playground


73.20.11

Deed of Warranty For Powder Coated Extruded Aluminium Framed Windows, Openable Windows, Vents, Fixed Glass Panels, Aluminium Swing Doors, and Aluminium Framed Sliding Doors

Appendix B1 and/or Appendix B1 (TC)

74.3.5

Deed of Warranty for Waterproofing System for Environmental Deck Within Retaining Walls


74.14.4

Deed of Warranty for Aluminium Sandwich Roofing Panel


74.26.24

Deed of Warranty for Children’s Playground Equipment

Appendix B4-1 and/or Appendix B4-1 (TC)

74.26.24

Deed of Warranty for Low Density Polyethylene or other Plastic Components of Children Playground Equipment

Appendix B4-2 and/or Appendix B4-2 (TC)

74.27.6

Deed of Warranty for Textured Coating System


74.28.8

Deed of Warranty for Storm Resistant Aluminium Louvres


76.10.6

Deed of Warranty for Water Proofing System for Basement Structures


BSS S73 73-15 of 73-57


73.3 PILING WORKS TO LINKWAYS AND PRECINCT PAVILIONS Where piling works to linkways and precinct pavilions are required as shown in the

Drawings, the Contractor shall ascertain the pile penetration lengths required and allow in the Contract Sum for all costs and expenses for providing the piling Works to the requirements specified under the Contract.

In ascertaining the pile penetration lengths, the Contractor may, if he wishes, refer to

the Soil Investigation Report available from the Employer. However, for the avoidance of doubt, the Soil Investigation Report shall not form part of the Contract or be taken into consideration in the interpretation or construction thereof or of the Contract. The Contractor shall take note that all the information in the Soil Investigation Report are only indicative of the likely soil conditions to be encountered at the Site. The Contractor shall at his own cost, ascertain the actual soil conditions and shall conduct his own site investigations

Notwithstanding the pile penetration lengths ascertained by the Contractor, there

shall be no adjustment to the Contract Sum for any difference in pile penetration lengths between those actually provided for the Works and those ascertained by the Contractor. However, in the case where any pile as shown in the Drawings is not provided at all, omission by way of variation to the Contract shall be effected. For the purpose of computing such omission amount only, the penetration length of each pile shall be deemed to be 8.0 m.

73.4 OPTIONAL COMPONENT SCHEME FOR PROVISION OF BEDROOM DOORS Notwithstanding any provisions to the contrary specified in the Contract, the

Contractor shall provide bedroom and Bath/WC doors complete with all the requisite ironmongery and accessories as specified, for 75% of the total number of each type of residential units included in the Works, rounded up to the nearest whole number where fractions are encountered.

For the avoidance of doubt, the Contractor shall be required to provide door frames

complete with the requisite hinges as specified for all units as specified and/or as shown.

At approximately 10 months before the Date of Substantial Completion of the first

residential building block of the Works, the Contractor shall check with the SO Rep on the exact number of bedroom and Bath/WC doors before placing confirmed order with his supplier. The SO Rep shall inform the Contractor the exact number and addresses of the residential units where bedroom and Bath/WC doors are to be installed. The Contract Sum shall be adjusted for any additional or shortfall in the number of doors provided by way of a variation under the Contract. The Contractor shall be deemed to have allowed in the Contract Sum for all costs and expenses to be incurred by him for complying with all the requirements specified in this clause.

BSS S73 73-16 of 73-57


73.5 INSTALLATION (ALUMINIUM FRAMED WINDOWS) This clause supersedes subclause 18.3.7 "Installation" of the Standard Specifications

For Building Works And Other Installations (a) Design and Profile of Aluminium Sections The design and profile of all the anodised aluminium sliding windows, casement

windows and top hung shall be as shown in the Drawings. Complete samples of windows shall be installed at the Site for approval by the

SO Rep. (b) Detailing All windows and other aluminium items shall be fixed strictly to the

manufacturer’s instructions. Any clearance spaces between the window work size and the work

surrounding the window shall be sealed with an approved sealant when fixing is completed.

Safety devices shall be provided to prevent window sashes from being

inadvertently forced out from the frame during and after installation. Allow for the provision of a safety lock device or stopper, made of 6-nylon or high density polyethylene or other approved material, to be securely housed into the top rail of head section to perform this function.

(c) Cement Mortar Infill The size of the openings surrounding the window shall be checked prior to

installation of window frame. Any deviation exceeding the allowable tolerances shall be corrected before installation of window frame.

Gap between the window and the adjacent structural member or in-fill non-

structural wall shall be filled with pre-packed cement mortar. The mortar shall be of the right consistency. Approved backing piece formwork and tool shall be used to ensure that the mortar infill is properly compacted and grooves are provided for application of approved sealant

(d) Application of Sealant Provide and apply approved sealant to the external periphery of the aluminium

framed windows as shown in the Drawings and ensure that all joints are sealed water tight and finished to a neat flush joint with the window frame. The application of sealant shall comply with the manufacturer's guides and instructions.

All sealant applicators shall possess a minimum of one year working experience

on sealing works endorsed by the sealant suppliers in the HDB List of Approved Materials And Suppliers. A list of these workers shall be submitted to the SO Rep for pre-screening and approval before they are allowed to commence work They are also required to wear identity pass to prove that they are approved sealant applicators.

Before sealing the joints, the surfaces shall be clean and free of all mortar dust

or other contaminants that may affect adhesion.

BSS S73 73-17 of 73-57


73.6 INSTALLATION ALUMINIUM FRAMED ADJUSTABLE LOUVRE WINDOWS This clause supersedes subclause 18.4.7 "Installations" of the Standard Specifications

For Building Works and Other Installations (a) Design and Profile of Aluminium Sections The design and profile of the bronze anodised aluminium framed adjustable

louvre windows shall be similar to those as shown in the Drawings.

Complete samples of windows shall be installed at the Site for approval by the SO Rep.

(b) Detailing All windows and other aluminium items shall be fixed strictly to the

manufacturer’s instructions.

Any clearance spaces between the window work size and the work surrounding the window shall be sealed with an approved sealant when fixing is completed.

(c) Cement Mortar Infill The size of the openings surrounding the window shall be checked prior to the

installation of window frames. Any deviation exceeding the allowable tolerances shall be corrected before installation of window frame.

Any gap between the window and the adjacent structural member or in-fill non-

structural wall shall be filled with pre-packed cement mortar. The mortar shall be of the right consistency. Approved backing piece formwork and tool shall be used to ensure that the mortar infill is properly compacted and grooves are provided for application of approved sealant

(d) Application of Sealant Provide and apply approved sealant to the external periphery of the aluminium

framed windows as shown in the Drawings and ensure that all joints are sealed water tight and finished to a neat flush joint with the window frame. The application of approved sealant shall comply with the manufacturer's guides and instructions.

All sealant applicators shall possess a minimum of one year working experience

on sealing works endorsed by the sealant suppliers in the HDB List of Approved Materials And Suppliers. A list of these workers shall be submitted to the SO Rep for pre-screening and approval before they are allowed to commence work They are also required to wear identity pass to prove that they are approved sealant applicators.

Before sealing the joints, the surfaces shall be clean and free of all mortar dust

or other contaminants that may affect adhesion.

BSS S73 73-18 of 73-57


73.7 CONTROL OF TILERS The Contractor shall employ workers that are capable of producing good workmanship

for all tiling Works. They shall possess Skill Evaluation Certificate on tiling works from local institutions. A list of these workers shall be submitted to the SO Rep for pre-screening and approval before they are allowed to commence work. These workers are also required to wear identification pass upon approval by the SO Rep. The pass shall be easily distinguishable from other pass used at the Site, by their colour, size or pattern.

73.8 WATER AND WEATHER TIGHTNESS TEST (SEMI - PRECAST CONSTRUCTION) This clause supersedes subclause 6.12.2 "Water And Weather Tightness Test" of the

Standard Specifications For Building Works and Other Installations. The joints in the superstructure shall be subjected to tests for water and

weather-tightness. Internal floors shall be tested prior to any tiling work. Testing shall be conducted only when all pipes, trunking, etc have been installed and the penetrations sealed, unless otherwise directed by the SO Rep.

(i) Method and Frequency of Testing Joints shall be tested with the method and frequency as described below: (a) Structural Roof, Access Balcony Roof And Lift Motor Room Roof Water tightness test shall be carried out on all roofs with precast joints in

accordance with Clause 4.32.2 "Watertightness And Water Stagnation Test".

(b) External Walls For external walls, a continuous jet of water shall be sprayed on the joint

corresponding to 600 litres per hour from a water hose having a nozzle velocity of 2m per second and a cone scatter of approximately 60 degrees held at a distance of 1.2m from the wall surface under test. The duration of the test shall not be less than 2 hours. The hose shall be placed with the nozzle in line with the vertical joint and at a level of horizontal joints so that the jet cone will cover a vertical and two horizontal joints as shown in the Drawings.

For external walls, the following tests shall be conducted for each building

block:

Building Height Frequency of tests Up to 10 stories 5 tests for vertical joints,

5 tests for horizontal joints Up to 20 stories 10 tests for vertical joints,




25 tests for horizontal joints

BSS S73 73-19 of 73-57


73.8 (i) (b) External Walls (Cont'd) These tests shall be carried out at any location as instructed by the SO

Rep. Water shall not seep into any part of the building during the test. For each test which fails, two additional tests shall be carried out at joint

locations as instructed by the SO Rep all at the Contractor's cost and expense.

(c) Gable End Walls All gable end walls shall be tested by spraying water from the top of the

walls at the top-most floor level for a duration of 2 hours. The hose shall be placed with the nozzle in line with the vertical joint at the top of the walls. Water shall not seep into any part of the building during the test.

(d) Refuse Chute All refuse chutes shall be tested by spraying water from the top of refuse

chutes. The water shall spray vertically downwards on all internal walls for a duration of 1 hour. No seepage of water from the joints shall be permitted during the test.

(e) Floor Joints Of Precast Slabs Floor joints of concrete slabs using precast prestressed concrete plank and

precast prestressed concrete hollow core slab with minimum 50mm in-situ concrete topping need not be tested.

Floor joints of precast slabs using either precast prestressed (or non-

prestressed) concrete plank or precast prestressed concrete hollow core slab without in-situ concrete topping or with concrete topping thickness less than 50mm shall be tested.

The floors of those areas (or dwelling units) to be tested shall be flooded

with water to a depth of 25mm for a period of one hour replenishing when necessary. The areas (or dwelling units) shall pass the test if no dampness or seepage from the dwelling units under test occurs in any adjoining areas (of dwelling units ) or common area during the test.

Two units (or dwelling units) per floor shall be tested. The locations of

these units (or dwelling units) to be tested shall be decided by the SO Rep. For each unit (or dwelling unit) that fails the water test, two additional units

(or dwelling units) shall be selected by the SO Rep for testing.

BSS S73 73-20 of 73-57


73.8 (i) (f) Kitchen/Bathroom/Toilet Areas (1) Carry out water test to the following items prior to any tiling work in

accordance with the procedure described below : (i) All joints between the floor slab and floor traps in the bathroom

and kitchen; (ii) All joints between the branching off for water closet and floor

slab; ` (iii) All floor joints between the precast slabs and walls in bathroom

and kitchen; and (iv) All floor joints between the precast slabs in bathroom and

kitchen. (2) The gratings to floor traps in the bathrooms and kitchens shall be

blocked temporarily with polythene sheets or by other suitable means and the floor flooded with about 25mm depth of water at the highest level of the slab. The amount of water shall be maintained for four hours, replenishing when necessary during which the underside of the floor slab shall be checked for signs of leaks.

Towards the end of this test, the water will be allowed to drain off.

During this process there shall be no sign of chokage in the system. 73.8 (ii) Water Test Failure In the event of failure of a test on any joint, the Contractor shall rectify the joint

and repeat the test. This procedure shall be repeated until the tests on the joints comply fully with the passing criteria. Furthermore, the SO Rep reserves the right to reject the use of any waterproofing materials or joint details that perform unsatisfactorily during water tests at no cost to the Employer.

Under no circumstances shall the Contractor be allowed to carry out his own

water test without the presence of the SO Rep. All water test (specified or not specified) shall be witnessed and certified by the SO Rep as well as the Contractor's Representative.

73.9 GLAZED PORCELAIN CERAMIC FLOOR TILES FOR KITCHEN, KITCHEN /

DINNING, SERVICE YARDS 73.9.1 General (a) Location and Extent

Provide and lay glazed porcelain ceramic floor tiles to kitchen, kitchen/dinning, service yards and to any other locations shown in the Drawings. The glazed porcelain ceramic floor tiles shall conform to all the requirements as specified in this clause. The pattern range shall be “Marble” or “Big Grain” or other approved pattern range. Provide a full range of colours and patterns of floor tiles for selection and approval by the SO Rep.

BSS S73 73-21 of 73-57


73.9 GLAZED PORCELAIN CERAMIC FLOOR TILES FOR KITCHEN, KITCHEN / DINNING, SERVICE YARDS

(b) Inconsistent Sizes

In the event that the ceramic floor tiles delivered to the Site are inconsistent in sizes but fall within the allowable tolerances as specified in this Clause including all subclauses under it, the tiles shall be sorted out into separate groups of compatible sizes to the satisfaction of the SO Rep. Tiles of one size group shall be laid in one area separate from tiles belonging to other size groups.

73.9.2 Approved Glazed Porcelain Ceramic Floor Tiles The type of glazed porcelain ceramic floor tiles provided by the Contractor as

specified in this clause shall be subject to the approval of the SO Rep. The SO Rep shall have the absolute prerogative to select the type of tiles from the list of approved glazed porcelain ceramic floor tiles as specified and no adjustment to the Contract Sum shall be made.

73.9.3 Testing Requirements (a) Test Samples And Methods All test samples shall be randomly chosen from the same batch of delivery by

the SO Rep. The test methods shall be in accordance with SS 483 : 2000 (Annex G ) unless otherwise stated.

(b) Test Certificates And Compliance Requirements

Provide test certificates by a testing laboratory accredited under SINGLAS to cover the tests mentioned in this Clause.

73.9.4 Technical Specifications Dimensional and surface quality requirements and physical and chemical properties

shall be accordance with the following :- (a) Dimensions The dimensions shall be as follows : Nominal Length : 300mm Nominal Width : : 300mm Thickness : 9mm

BSS S73 73-22 of 73-57


73.9.4 Technical Specifications The dimensional tolerances shall be as follows:

(i) Length : Average length of each tile shall not deviate by more than ± 1.0mm from the average length of 10 test specimens.

(ii) Width : Average width of each tile shall not deviate by more than ± 1.0mm from the average width of 10 test specimens.

(iii) Thickness : Average thickness of each tile shall not deviate by more than ± 5% from the average thickness of 10 test specimens. The average thickness of each tile shall not be less than 9mm.

(iv) Straightness Of Sides

: Maximum deviation of each tile shall not exceed 1.0mm of the work size.

(v) Rectangularity : Maximum deviation of each tile shall not exceed 1.0mm of the work size.

(vi) Flatness of Surface

: Maximum centre curvature of each tile shall not exceed 1.0mm of the length of the corresponding diagonal calculated from the work size. The maximum edge curvature of each tile shall not exceed 1.0mm of the work size. The maximum warpage of each tile shall not exceed 1.0mm of the length of the corresponding diagonal calculated from the work size.

(b) Surface quality

The tiles shall be free from objectionable surface blemishes such as projections, depressions, flakes, hairline cracks and bubbles. The tiles shall be level and regular in size with properly formed corners and shall not be warped or deformed in any manner.

(c) Physical properties

(i) Water Absorption : Shall be a maximum of 0.5%

(ii) Modulus Of Rupture : Minimum average strength shall not be less than 35 N per sq.mm.

(iii) Breaking Strength : Not less than 1300 N

(iv) Colour Tone : The colour tone of the tiles shall be consistent. The SO Rep reserves the right to reject tiles that show colour tone variation including such tiles that have already been laid.

BSS S73 73-23 of 73-57


73.9.4 Technical Specifications (d) Chemical properties

(i) Staining Test : The procedure for carrying out the test is as follows : Allow 3 or 4 drops of each of the test solutions (Methylene blue solution, 10g/L and Potassium permanganate solution, 10g/L), to fall on a fresh part of the test specimen. Place an approximately 30mm diameter convex watch glass on the applied drop in order to spread it to an approximately circular area. Allow to remain for 24 hours and then rinse the surface with running water and wipe with a damp cloth. If a stain remains, thoroughly clean with a solution of the standard cleaning agent. Performance Criteria The stain test result shall be as follow : 1) Methylene Blue : Class 1 2) Potassium Permanganate : Class 2 Where ; Class 1 = Stain removed by water; Class 2 = Stain removed by cleaning agent.

(ii) Resistance to household chemicals

: Minimum GB

(iii) Slip Resistance : The Slip resistance test method shall be in accordance with SS 485:2001. The test shall be conducted under dry condition using dry floor friction test method with a coefficient of friction of minimum 0.4.

73.9.5 Laying Of Floor Tiles

Laying of floor tiles shall be in accordance with clause 19.5.6 “Laying Of Ceramic Floor Tiles”.

BSS S73 73-24 of 73-57


73.10 CERAMIC FLOOR TILES FOR BATH/WC AND WC

This clause supersedes Clause 19.5 “Ceramic Floor Tiles (Kitchen, Kitchen/Dinning, Bath/Wc and Wc)” of the Standard Specifications for Building Works and Other Installations.

73.10.1 General (a) Location and Extent

Provide and lay ceramic floor tiles to bath/wc, wc and at other locations as shown in the Drawings.


The tiles shall be sorted out at the factory into two size groups with each size group having the size range of 1 mm. Tiles of one size group shall be laid in one area separate from tiles belonging to other size group. There shall be clear indication of the size group in the tile boxes. This is required even if the sizes are within the dimensional tolerance allowed for the production variations spelt out in the subclause “Technical Specifications” specified hereunder.

73.10.2 Approved Ceramic Floor Tiles The type of ceramic floor tiles provided by the Contractor as specified in this clause

including all subclauses under it shall be subject to the approval of the SO Rep. The SO Rep shall have the absolute prerogative to select the type of tiles from the list of approved ceramic floor tiles for such locations as specified and no adjustment to the Contract Sum shall be made. Notwithstanding any approval by the SO Rep, the Contractor shall ensure that all such ceramic floor tiles for such locations as specified comply with the requirements as specified in this clause including all subclauses under it.

The colour of ceramic floor tiles for such locations as specified in the schedule of the

said subclause shall be BLUE and/or PINK and/or BEIGE and/or GREY. Provide samples of ceramic floor tiles with the colour range as specified for selection and approval by the SO Rep.

73.10.3 Testing Requirements (a) Test Samples And Methods All test samples shall be randomly chosen from the same batch of delivery by

the SO Rep. The test methods shall be in accordance with SS 483 : 2000 ( Annex J ) unless otherwise stated.

(b) Test Certificate And Compliance Requirement Provide test certificates by a testing laboratory accredited under SINGLAS to

cover the tests mentioned in this clause and all other tests mentioned in the testing schedule.

BSS S73 73-25 of 73-57



shall be accordance with SS 483 : 2000 (Annex J) unless otherwise stated : (a) Dimensions The dimensions shall be as follows : Nominal Length : 200mm Nominal Width : 200mm Thickness : 8mm and/or as directed by the SO Rep The dimensional tolerances shall be as follows :

(i) Length : Average length of each tile shall not deviate by more than ± 1mm from the average length of 10 test specimens.

(ii) Width : Average width of each tile shall not deviate by more than ± 1mm from the average width of 10 test specimens.

(iii) Thickness : Average thickness of each tile shall not deviate by more than ± 5% from the average thickness of 10 test specimens.

(b) Surface Quality The tiles shall be free from objectionable surface blemishes such as projections,

depressions, flakes, hairline cracks and bubbles. The tiles shall be level and regular in size with properly formed corners and shall not be warped or deformed in any manner.

(c) Physical Properties

(i) Water Absorption : Shall be a maximum of 6%

(ii) Modulus Of Rupture : Minimum average strength shall not be less than 22 N

per sq.mm.



BSS S73 73-26 of 73-57


73.10.4 Technical Specifications (d) Chemical Properties

(i) Staining Test : The procedure for carrying out the test is as follows : Allow 3 or 4 drops of each of the test solutions (Methylene blue solution, 10g/L and Potassium permanganate solution, 10g/L), to fall on a fresh part of the test specimen. Place an approximately 30mm diameter convex watch glass on the applied drop in order to spread it to an approximately circular area. Allow to remain for 24 hours and then rinse the surface with running water and wipe with a damp cloth. If a stain remains, thoroughly clean with a solution of the standard cleaning agent. Performance Criteria The stain test result shall be as follow : 1) Methylene Blue : Class 2 2) Potassium Permanganate : Class 2 Where; Class 2 = Stain removed by cleaning agent.

(ii) Slip Resistance

: Slip resistant properties shall be required and test carried out for ceramic floor tiles to bath/WC. The slip resistance test method shall be in accordance with SS 485:2001. The test shall be conducted under wet conditions using a pendulum friction test method with a classification of X. The test shall also be conducted under dry condition using dry floor friction test method with a coefficient of friction of minimum 0.4.

(iii) Reverse Staining Test

: The procedure for carrying out the test is as follows : (a) Five full pieces of tiles shall be selected and checked to

ensure that there are no Defect or damages. The tiles shall also be checked for signs of tonality difference.

(b) Dry the tiles in a ventilating oven at 105oC for 48 hours. (c) With the top or glazed surface facing downwards, “pond”

the biscuit (ie. back of the tile) with potable water over a circular area of 50mm diameter and with a water height of 25mm. At interval of every 5 minutes, inspect with the naked eye or prescription glasses if usually worn and under sufficient light intensity (> 300 lux), the top or glazed surface for signs of dark patches up to a total “ponding” duration of 30 minutes.

(d) Repeat the aforementioned test on another five pieces of

tiles but using methylene blue solution diluted at 2g of methylene blue per litre.

(e) Performance Criteria The tiles shall not show any sign of dark patches on the

top or glazed surfaces. 73.10.5 Laying Of Floor Tiles Laying of floor tiles shall be in accordance with clause 19.5.6 “Laying Of Ceramic

Floor Tiles”.

BSS S73 73-27 of 73-57


73.11 WROUGHT IRON STEEL GATES TO FLAT ENTRANCES This Clause supersedes clause 18.24 "Wrought Iron Steel Gates To Flat Entrances"

of the Standard Specifications For Building works and Other Installations. Provide and fix wrought iron steel gates to all entrance doors of flats. The gates shall be constructed in accordance with the pattern and types as shown in

the Drawings. The gates shall be of the correct sizes to fit the entrance door frames and be obtained from approved manufacturers. All welding and joints shall be neat and finished smooth. The gates shall have leaf opening first on the same side as the lock on the flat entrance door. The particular type of wrought iron steel gates shall be to the particular pattern to each apartment block as shown in the Drawings. All rivets shall be finished with matching colour to the gate.

Provide workshop drawings for approval by the SO Rep. A complete sample shall be

installed on the Site for the approval of the SO Rep before full implementation. Preparation All welded joints shall be made smooth. Remove rust mechanically from the surface

of wrought iron. Clean the surface to remove oil, grease and dirt. Painting The Contractor shall seek the SO Rep approval on the painting system for the

wrought iron steel gate. The Contractor shall submit a range of colours for the SO Rep approval. The colour and finishing of the gate shall be approved by the SO Rep. The painting system shall be:

(i) One coat of CED primer; (ii) One coat of acrylic based or PU based finishing paint with special effects and antique appearance; (iii) One final coat of clear acrylic based or PU based lacquer. 73.12 PERFORMANCE REQUIREMENTS (CAST-IN-SITU EPDM RUBBER FLOORING

FOR CHILDREN’S PLAYGROUND) This clause supersedes subclause 25.12.5 "Performance Requirements" of the

Standard Specifications for Building works and Other Installations. Where cast-in-situ EPDM Rubber flooring for children's playground is included in the

Works, test certificates for the performance requirements specified hereunder shall be submitted to the SO Rep for approval. The performance requirements and test methods for impact absorbing playground surfacing shall comply with SS 495:2001.

(a) Resistance To Abrasive Wear The cast-in-situ surfaces shall exhibit the performance specified hereunder : (i) Wear index shall be less than 1.0; (iii) Wear ratio (p) shall be not less than 1.0 and not more than 3.0

BSS S73 73-28 of 73-57


73.12 PERFORMANCE REQUIREMENTS (CAST-IN-SITU EPDM RUBBER FLOORING FOR CHILDREN’S PLAYGROUND) (Cont’d)

(b) Slip Resistance The minimum slip resistance measured in any direction of test, under

either wet or dry conditions shall not be less 40. (c) Resistance To Indentation The residual indentation (r), after 24 hour recovery, shall not be more than

5.0mm. after removal of the load and after allowing for 24 hour recovery, none of the

specimens tested shall exhibit any cracking, splitting or perforation around the point at which the load was applied.

(d) Ease Of Ignition The greatest radius of effects of ignition shall not exceed 35mm and shall

thereby be classified as having a “LOW radius of effects of ignition”. (e) Critical Fall Height Critical fall height of impact absorbing surfacing shall comply with SS 495:2001. Before handing over the playground including playground equipment, contractor is

required to conduct impact attenuation test at site to comply with SS 495:2001 and shall submit Performance Compliance Certificate, together with test report attached in the format as shown in Appendix A46, to the SO Rep.

73.13 Gasket (Blast Door) This clause supersedes subclause 8.3(f) "Gasket" of the Standard Specifications For

Building Works And Other Installations. The material for the gasket shall be Neoprene or EPDM rubber and shall meet the

requirements of Type 2 closed cell expanded rubber, either grade 2A3 or higher; or grade 2B3 or higher as specified in Table 2 of ASTM D1056; or other approved

73.14 Gasket (Ventilation Sleeve & Plate Unit) This clause supersedes subclause 8.4(c) "Gasket" of the Standard Specifications For

Building Works And Other Installations The material for the gasket shall be Neoprene or EPDM rubber and shall meet the

requirements of Type 2 closed cell expanded rubber, either grade 2A3 or higher; or grade 2B3 or higher as specified in Table 2 of ASTM D1056; or other approved

BSS S73 73-29 of 73-57


73.15 TIMBER DOOR WITH HIGH PRESSURE PLASTIC LAMINATE FINISH TO BATH/WC

This Clause supersedes Clause 15.19 “Solid Timber Veneered Doors With

Decorative Inlay To Bath/WC” including all subclauses under it of the Standard Specifications For Building Works And Other Installations.

73.15.1 General Requirements All doors to bath/wc of residential units shall be semi-solid timber doors with 0.8mm

thick high pressure plastic laminate finish. Such doors shall be installed complete with mild steel door frames, door frame fixing and ironmongery.

The thickness of the door panels shall be approximately 38mm to fit into the rebate of

the door frame profile. The Contractor shall provide “wood grain” laminates to match the design pattern of the bedroom door. The type, pattern and colour of laminate shall be approved by the SO Rep. The Contractor shall check with the SO Rep on the actual quantity of doors to be installed.

The high pressure plastic laminates shall meet or exceed NEMA Publication LD 3-

2000. The laminates shall be “Wilsonart”, “Nevamar”, “Pionite” or other approved. 73.15.2 Installation The plastic laminates should be bonded to 6mm thick marine-ply using adhesives and

techniques as recommended by the supplier.

All exposed edges of the solid timber laminated door shall be finished with 12mm thick nyatoh lipping.

73.15.3 Shop Drawings and Samples Before commencement of the work, provide workshop drawings for approval by the

SO Rep. A complete sample shall be installed on the Site for the approval of the SO Rep before full implementation.

73.15.4 Surfaces The surfaces of the laminate and timber door edging shall be free from stains,

adhesive marks, manufacturing faults and other blemishes liable to impair the aesthetics of the door.

73.15.5 Moisture Content The moisture content of timber for all timber components shall be in accordance with

Clause 15.9 “Timber Doors”. 73.15.6 Ironmongery For Semi-Solid Timber Door with Laminate Finish The ironmongery items for each door leaf of laminated semi-solid timber doors shall

be: (a) 3 nos. 102mm x 76mm x 3mm solid brass hinges (satin finish) with flat button tip

and ball bearing complete with matching finish screws; (b) 1 no. “Posse” J4LA630-AB or “YTL” LH630AB or “Accord” J4LA630-AB or other

approved antique brass finish lever handle lockset with emergency release on the outside and thumb turn on the inside and solid brass lever handles on both sides.

BSS S73 73-30 of 73-57


73.15.7 Rubber Stopper Provide and fix 25mm diameter by 30 mm thick rubber stopper to the glazed wall tile

surface of every bath/wc against which the door opens in a position effective in stopping the door from damaging the wall tiles. Fix the rubber stopper with stainless steel screw and raw plug.

73.16 THREE-WAY NATURAL ANODISED ALUMINIUM LETTER BOXES WITH MASTER

DOORS This clause supersedes Clause 18.13 “Three-Way Powder Coated Aluminium Letter

Boxes With Master Doors” including all subclauses under it of the Standard Specifications For Building Works And Other Installations.

Supply and fix three-way natural anodised aluminium letter boxes to locations as

shown in the Drawings. These letter boxes shall be obtained from suppliers approved by the SO Rep.

The thickness of the aluminium sheet shall be as shown in the Drawings and the

thickness tolerance shall be ±10%. The anodic coating shall be not less than 25 microns for the extruded aluminium section and not less than 15 microns for the aluminium sheets.

Letter boxes shall be provided for each residential unit. A minimum of two additional

letter boxes shall be provided for ground floor facilities to each building block as shown in the Drawings. In addition to the two letter boxes, one additional letter box shall be provided for “For Returned Mail Only”. The location of the “For Returned Mail Only” letter box shall be as shown in the Drawings.

The building block number, road name and postal code shall be engraved on the top

frame and at the location as shown in the Drawings. The unit number of the residential unit shall be engraved and painted on the individual letter box aluminium door and on the upturn as shown in the Drawings. The actual block number, unit number, road name and postal code shall be decided by the SO Rep. The phrase "For Returned Mail Only" shall be engraved and painted on the returned mail letter box aluminium door and on the upturn as shown in the Drawings.

Submit complete set of workshop drawings for the approval of the SO Rep. The keys for the letter boxes shall be kept in separate envelopes and numbered to

correspond with the numbers on the boxes and handed over to the Employer on Substantial Completion of the Works. Three keys shall be provided for each individual letter box.

The two master doors shall be provided with different key-aliked locksets approved by

the SO Rep. Three master door keys for the Town Council shall be provided for each building block and shall be handed over to the Employer on Substantial Completion of the Works. Three master door keys for Singapore Post shall be provided for each building block and shall be handed over to Singapore Post on Substantial Completion of the Works.

BSS S73 73-31 of 73-57


73.17 SUBMISSIONS BY LICENSED WATER SERVICE PLUMBER (LWSP) This clause supersedes clause 36.19 "Submissions By Registered Professional

Engineer (PE) And Licensed Water Service Plumber (LWSP)" of the Standard Specifications For Building Works And Other Installations.

The Contractor shall engage a Licensed Water Service Plumber (hereinafter referred

to as "LWSP" for the purposes of this clause) to supervise and co-ordinate all matters relating to the water service Works.

The Contractor’s LWSP shall assist the SO Rep for the necessary notification to PUB

prior to the commencement of water service Works and the submissions to PUB of site plans and schematic drawings of water reticulation systems involving water storage cisterns (water storage tanks) and/or pumping equipment and for the certification of compliance with SS CP 48 – Code of Practice for Water Services, Public Utilities (Water Supply) Regulations and other PUB requirements. Upon completion, the LWSP shall inspect the water service installations and arange for the lodging of a Certificate of Satisfactory Completion with PUB to certify the satisfactory completion of the water service installations and in compliance PUB requirements.

The Contractor’s LWSP shall notify PUB prior to the commencement of water service

Works and submit to PUB site plans and schematic drawings of water reticulation systems for minor water service Works which does not involve installation of water storage cisterns (water storage tanks) and/or pumping equipment and certify compliance with SS CP 48 – Code of Practice for Water Services, Public Utilities (Water Supply) Regulations and other PUB requirements. Upon completion, the LWSP shall submit a Certificate of Satisfactory Completion to PUB certifying that the work has been carried out in accordance with PUB requirements

73.18 ILLUMINATED ESTATE BLOCK NUMBER SIGNAGE In addition to providing such signages as specified in Clause 18.26 "Numeral Estate

Block Number Signage", the Contractor shall also provide and fix two numbers of illuminated estate block number signages to the details as shown in the Drawings for each building block (including multi-storey carpark/garage block and precinct pavilion). The signages shall be located at the second storey beam and the position shall be decided by the SO Rep. For precinct pavilion, both the location and position of the signage shall be decided by the SO Rep. The actual block number shall be made known later in the course of the Works. The signage shall be double sided illuminated estate block number and shall be made from powder coated extruded aluminium frame with an eclipse sign face as shown in the Drawings. The signage shall have powder coated aluminium sign face cut out text mounted with 3-dimensional injection moulded plexiglas lettering/number. The thickness of the aluminium frame and aluminium sheet shall be as shown in the Drawings. The signage shall be reinforced with galvanised steel brackets as shown in the Drawings.

Submit shop drawings and a sample to the SO Rep for approval prior to their

installations. Provide and fix all electrical cables, ballast, lamp holders, fluorescent tubes and other

necessary lighting accessories including connection with wiring from the nearest connection box.

The powder coating shall be superdurable architectural powder coating and shall

comply with subclause 18.13.3 "Polyester Powder Coating". The colour of the powder coating shall be approved by the SO Rep.

BSS S73 73-32 of 73-57


73.19 LIGHTNING PROTECTION TO METALLIC ROOFING SYSTEM For metallic roofing system or roof structure at the roof or envelope of the building,

the whole metallic body and any individually isolated metallic parts shall be bonded to the main lightning protection system to comply with or otherwise satisfy the lightning protection requirements specified in Singapore Standard CP 33:1996.

The design (where applicable), manufacture and installation of such metallic bodies

or parts shall be carried out judiciously such as to ensure the electrical continuity of the whole metallic roofing by proper connections/joints and maintain its warranty. An adequate number of accessible bonding points shall be provided.

Upon completion, the Contractor shall submit to the SO Rep detailed drawings

showing the metallic roofing or structure and the bonding to the main lightning protection system.

73.20 POWDER COATED EXTRUDED ALUMINIUM FRAMED WINDOWS, OPENABLE WINDOWS, VENTS, FIXED GLASS PANELS, ALUMINIUM SWING DOORS, AND ALUMINIUM FRAMED SLIDING DOORS 73.20.1 Over-Riding Clause The Contractor and his Specialist executing the Works as required in this clause

including all subclauses under it have to ensure that the Works, goods or materials used shall be suitable and reasonably fit for the purposes for which they are required (hereinafter referred as "Performance Requirement"). In the event the Works, goods or materials to be used as specified in this clause including all subclauses under it are upgraded in order to meet the Performance Requirement, the Contractor and his Specialist shall do all necessary upgrading at no extra cost to the Employer.

73.20.2 General Supply and fix powder coated extruded aluminium framed windows, openable

windows, vents, fixed glass panels, aluminium framed sliding doors complete with glazing, aluminium swing doors and all components to locations as shown in the Drawings. Extruded aluminium framed windows shall include sliding windows, casement windows, top hung, vents and aluminium cills and others as shown in the Drawings.

Unless otherwise specified, all aluminium sliding and casement windows provided

shall comply in all aspect with SS 212 : 2000, except for the modularly co-ordinating sizes and finish to the aluminium window.

The manufacturer/supplier of aluminium sliding and casement windows shall be

under the PSB Singapore Quality Mark Scheme or PSB Product Listing Scheme Class 1A. which will cover full compliance with SS 212 and the finish to the aluminium window.

Unless otherwise specified, all aluminium sliding doors provided shall comply with

SS 268 and clause 18.5 "Bronze Anodised Extruded Aluminium Sliding Doors" including all subclauses under it, except for the surface finish to the aluminium door specified therein.

BSS S73 73-33 of 73-57


73.20.3 Performance When directed by the SO Rep, the Contractor shall send sample(s) of the aluminium

windows for performance tests as required in SS 212 to be carried out by PSB or a testing laboratory accredited under SINGLAS.

The details shown in the Drawings shall serve as a guide only. The Contractor shall

submit shop drawings to ensure compliance with SS 212. 73.20.4 Material (A) Aluminium Alloy All extruded aluminium members shall be fabricated from designated treated

aluminium alloy 6063T4, 6063T5 or 6063T6 complying with BS 1474. (B) Accessories All screws, nuts, bolts, washers, fasteners and all other accessories to be used

in the fabrication of the windows shall be stainless steel type 304 or 316 complying with BS 1449: Part 2. All screws (except screws used to fix stainless steel hinges), bolts and other accessories which are exposed shall be in approved matching colour. All screws used to fix stainless steel friction hinges shall be approved stainless steel screws precoated with epoxy coating as shown in the Drawings.

(C) Rollers, Guides and Stoppers Rollers used shall be made of hardened synthetic resin with ball bearing at

their cores. Guides and stoppers shall be of synthetic resin material and the exposed parts shall be in black or other approved matching colour.

(D) Joints and Gaskets All joints shall be sealed with synthetic butyl rubber and all inner frames shall

have insertion of gaskets or other air gaskets or other air-tightening materials complying with SS 212:2000. Gaskets shall be neoprene or ethylene propylene diene monomer (EPDM).

(E) Safety Device Safety devices shall be incorporated into all the glazed sliding window panels

to prevent them from jumping track and shall be in black or other approved matching colour.

(F) Weather Strip All weather strip shall be of approved neoprene or polypropylene pile or

ethylene propylene diene monomer (EPDM).

BSS S73 73-34 of 73-57


73.20.4 Material (G) Hardware For sliding windows, crescent lock shall be provided and shall be of stainless

steel type 304 or 316, aluminium die cast or zinc die cast with double locking device. For casement and top hung windows, the cam handles shall be of aluminium or zinc die cast. Friction hinges shall be of Grade 304 stainless steel. All crescent locks and handles shall be finished in black or other approved matching colour.

(i) Torque Testing Requirements For Crescent Lock The crescent locks shall comply with the following : (a) Average torque shall achieve a minimum value of 7 Nm; (b) Individual torque shall not fall below 6.5 Nm. (ii) Resistance To Wear Test Requirements For Casement Handles The casement handles when tested in accordance with BS 6462 clause

5.2.3 shall comply with the following: (a) Cam handle in the fully engaged position after 35 N was removed.

Requirement: pull-in shall not be reduced to less than 0.2 mm; (b) Torque to turn the fastener handle to the fully engaged position.

Requirement: The operating torque when measured shall not exceed 5 Nm.

(iii) Requirements of improved stainless steel friction stays(with four screws) The stainless steel friction stays shall comply with the following

requirements :

Test Requirements 300N for 5 second Passed Resistance to

obstructed stay track Destruction Test Arm bent at 40 kg (392N) minimum

200N for 5 second Passed Strength of maximum opening stop Destruction Test Stay track permanent deformed at

65 kg (638N) minimum 1000N for 1 min. passed

Resistance to accidental loading Destruction Test

Stay track bent at 130kg (1275N) minimum Sash remains intact 150kg (1472N) minimum

50,000 cycles Passed (no adjustment throughout the test) Endurance of

Fastener 100,000 cycles Passed (no adjustment throughout

the test)

BSS S73 73-35 of 73-57


73.20.5 Polyester Powder Coating The aluminium shall be finished with polyester powder coating. The polyester

powder coating shall be super-durable architectural powder coating "Oxyplast APR" or "Tiger Drylac U Series 58" or other approved. The powder coating shall comply with all the requirements as specified in this subclause. Unless otherwise specified, all test procedures shall be in accordance with AAMA 2604-98 "Voluntary Specifications, Performance Requirements and Test Procedures for High Performance Organic Coatings on Aluminium Extrusions And Panels". The powder coating shall be applied by approved applicator and supplied by approved window suppliers. The powder and powder coating applicator shall be certified under PSB Product Listing Scheme Class 1A.

(A) General Requirements (i) Surfaces Coatings shall be visibly free from flow lines, streaks, blisters or other

surface imperfections in the dry film state on the exposed surfaces when observed at a distance of ten (10) feet (120 inches) from the metal surface and inspected at an angle of 90 degrees to the surface.

(ii) Thickness The total dry film thickness on each significant surface of the coating on

each piece shall be 60µm - 100µm. (iii) Minor Scratches And Blemishes Minor scratches and blemishes shall be repairable with the coating

manufacturer's recommended product or system. Such repair shall match the original finish when tested as outlined in the subclause "Dry Adhesion" specified hereunder. After application, allow the repair coating to dry for at least 72 hours at 65-80 degrees F before conducting the film adhesion test. The size and number of touch-up repairs shall be kept to a minimum.

(B) Test Specimens Test specimens shall consist of finished panels or extrusions representative of

the production coated aluminium. A sufficient number of specimens on which to conduct instrument measurements with flat coated surfaces of at least 6" long and 3" wide, shall be submitted to the test laboratory.

(C) Metal Preparation And Pre-Treatment A multi-stage cleaning and pre-treatment system shall be required to remove

organic and inorganic surface soils, remove residual oxides, and to apply a chemical conversion coating to which organic coatings will firmly adhere.

The products used to form the chemical conversion coating on aluminium

extrusions and panelling shall conform with ASTM D 1730, Type B, Method 5 or Method 7.

BSS S73 73-36 of 73-57


73.20.5 Polyester Powder Coating (Cont'd)

(C) Metal Preparation And Pre-Treatment

The coating weight of the chemical conversion coating shall be a minimum of 30 mg. per sq. ft. on the exposed surfaces as specified in ASTM B 449, Section 6, Class 1. Processing shall conform with that specified in ASTM B 449, Section 5.

(D) Colour Uniformity Colour uniformity shall be consistent with the colour range as established

between the approved source and the applicator. (E) Specular Gloss Gloss values shall be within ±5 units of the manufacturer's specification. The Standard gloss range reference values are : Gloss Colours Specular Gloss Value High 80 - Over Medium 20 - 79 Low 19 or less (F) Dry Film Hardness No rupture of film per ASTM D 3363. (G) Film Adhesion (i) Dry Adhesion No removal of film under the tape within or outside of the cross hatched

area or blistering anywhere on the test specimen (ii) Wet Adhesion No removal of film under the tape within or outside of the cross hatched

area or blistering anywhere on the wet test specimen. (iii) Boiling Water Adhesion No removal of film under the tape within or outside of the cross hatched

area or blistering anywhere on the wet test specimen. (H) Impact Resistance No removal of film to substrate. (I) Abrasion Resistance Using the failing sand test method ASTM D 968, the Abrasion Coefficient

Value of the coating shall be 40 minimum.

BSS S73 73-37 of 73-57


73.20.5 Polyester Powder Coating (Cont'd) (J) Chemical Resistance (i) Muriatic Acid Resistance (15 Minute Spot Test) No blistering, and no visual change in appearance when examined by

the unaided eye. (ii) Mortar Resistance (24 Hour Pat Test) Mortar shall dislodge easily from the painted surface, and any residue

shall be removable with a damp cloth. Any lime residue should be easily removed with the 10% muriatic acid solution described in the Clause "Muriatic Acid Resistance" of AAMA 2604-98. There shall be no loss of film adhesion or visual change in appearance when examined by the unaided eye.

(iii) Nitric Acid Resistance Not more than 5 Delta E Units(Hunter) of colour change, calculated in

accordance with ASTM D 2244, when comparing measurements on the acid-exposed painted surface and the unexposed surface.

(iv) Detergent Resistance No loss of adhesion of the film to the metal. No blistering and no

significant visual change in appearance when examined by the unaided eye.

(K) Corrosion Resistance (i) Humidity Resistance (For 3,000 Hours At 100 Degrees F And 100% RH With Cabinet Operated In Accordance With ASTM D 2247 or ASTM D 4585) Formation of blisters not to exceed "Few" blisters Size No. 8, as shown in

Figure 4, ASTM D 714. (ii) Salt Spray Resistance(3,000 Hours According To ASTM B 117 Using 5% salt solution) Minimum rating of 7 on scribe or cut edges, and a minimum blister rating

of 8 within the test specimen field.

BSS S73 73-38 of 73-57


73.20.5 Polyester Powder Coating (Cont'd) (L) Weathering The coating shall maintain its film integrity and as a minimum meet the colour

retention, chalk resistance, gloss retention and erosion resistance properties specified hereunder. The SO Rep shall request data relative to the long term durability of the colour/colours selected.

(i) Test Site And Duration Test sites for on-fence testing are acceptable as follows : Florida exposure South of latitude 27 degrees North at a 45 degree angle

facing South for five years. (ii) Colour Retention Maximum of 5 Delta E units (Hunter) Colour change as calculated in

accordance with ASTM D 2244-85, Section 6.3 after the exposure test as per foregoing subclause "Test Site and Duration".

(iii) Chalk Resistance Chalking shall be no more than that represented by a No. 8 rating based

on ASTM D 659 after test site exposure. (iv) Gloss Retention Gloss retention shall be a minimum of 50% after the exposure test. (v) Resistance To Erosion

Less than 10 percent film loss after the exposure test expressed as a percent loss of total film.

(M) QUV A340 (ASTM G53, 3000 Hours - 8 Hours UV, 4 Hours Condensation) (i) Gloss Retention 70 - 100% (ii) Colour Retention Shall be not more than 5 Delta E units of colour change. (N) QUV B313 (336 Hours - 8 Hours UV At 60 Degrees C, 4 Hours Condensation At 50 Degrees C) (i) Gloss Retention 80 - 100 % (ii) Colour Retention Shall be not more than 5 Delta E units of colour change.

BSS S73 73-39 of 73-57


73.20.6 Appearance The powder coating on the significant surface shall not have any scratches through

to the base metal. It shall be of even colour and gloss with good coverage. It shall not have Defect such as excessive roughness, flow lines, bubbles, inclusions, craters, blisters, dull spots, pin holes, scratches or any other unacceptable flaws.

The actual appearance of the finish shall be assessed by reference to samples to be

agreed upon between the Contractor and the SO Rep and thereafter maintained within agreed limits.

73.20.7 Colour The finishing colour of the powder coating shall be selected by the SO Rep. The

Contractor shall seek approval from the SO Rep on the colour selection prior to the application of the powder coating.

73.20.8 Temporary Protection And Prevention Of Damage

All powder coated extruded aluminium windows shall not be allowed to rub or slide against each other and significant surfaces shall be well protected during transportation. They shall be wrapped with stout papers, cardboard or other protective media which shall not be allowed to get damp. The complete window installation shall be protected against damage by contaminated moisture, cement and plaster splashes or droppings. The materials to be used for protection shall be in accordance with the manufacturer's instructions and recommendations.

73.20.9 Storage And Protection Ensure and provide proper and safe storage for all materials delivered to the Site

and the continued proper condition of installed windows at the Site until such time the building is handed over to the Employer.

73.20.10 Installation (A) Design And Profile Of Aluminium Sections The design and profile of all the powder coated aluminium sliding windows,

casement windows and top hung shall be as shown in the Drawings. Complete samples of windows shall be installed at the Site for approval by the

SO Rep. (B) Detailing All windows and other aluminium items shall be fixed strictly to the

manufacturer's instructions. Safety devices shall be provided to prevent window sashes from being

inadvertently forced out from the frame during and after installation. Allow for the provision of a safety lock device or stopper, made of 6-Nylon or high density polyethylene or other approved material, to be securely housed into the top rail of the head section to perform this function.

BSS S73 73-40 of 73-57


73.20.5 Polyester Powder Coating (Cont'd) (C) Application Of Waterproof Sealant Provide and apply waterproof sealant or other approved to the external

periphery of the aluminium framed windows as shown in the Drawings and ensure that all joints are sealed water tight and finished to a neat flush joint with the window frame.

(D) Glazing (a) Glass All glazing panel of aluminium sliding window shall be fixed to the inner

aluminium frames in the factory as a complete system before delivery to the Site. All glazing of casement and top hung can be fixed to the aluminium frames at the Site. All glass shall be relatively distortion-free.

Unless otherwise stated, all tinted glass shall be 5mm ±0.3mm green

gray/gray tinted float glass with a shading coefficient of 0.75. Glazing to adjustable louvre window between the kitchen and service

balcony/courtyard shall be 6mm ±0.3mm clear float glass. Glazing panel to vent of bath/wc shall be obscured wired glass of

thickness 6mm ±0.3mm. Unless otherwise stated, all tinted glass for sliding door shall be 6mm

±0.3mm green gray/gray tinted float glass with a shading coefficient of 0.75.

(b) Glazing Accessories All glazing accessories shall be new, first quality of their respective kinds

and subject to the approval of the SO Rep. (c) Protection Use all means necessary to protect glass and glazing materials before

during and after installation. (d) Replacements In the event of damage, immediately carry all repairs and replacements

necessary to the approval of the SO Rep. (e) Fixing Set all glass in a true plane, tight and straight, with proper and adequate

clearance, firmly anchored to prevent rattling and looseness, with all edges cleanly cut, do not nip or seam the edges.

(f) Cleaning Up Upon completion of glazing, thoroughly clean all glass surfaces, correct

all imperfections and replace all damaged glass.

BSS S73 73-41 of 73-57


73.20.11 Warranty The Contractor and his Specialist shall warrant the Works on the terms and

conditions as stipulated in the Deed Of Warranty For Powder Coated Extruded Aluminium Framed Windows, Openable Windows, Vents, Fixed Glass Panels, Aluminium Swing Doors, And Aluminium Framed Sliding Doors as produced in Appendix B1. In this respect, the Contractor and his Specialist shall submit such Deed of Warranty to the Employer or to such other party or such town council(s) as the SO Rep may at its sole discretion decide. In the event that the Deed of Warranty for part of the Works or for the whole Works is to be submitted to such Town Council(s), the Contractor and his Specialist shall submit such Deed of Warranty as produced in Appendix B1(TC) to such Town Council(s). The duly executed Warranty shall be submitted immediately upon request by the SO Rep, and if no such request is made, then at such time when the SO Rep considers the Works have been substantially completed in accordance with the Contract. In the event the Contractor and his Specialist shall fail to execute and submit the Deed of Warranty within the time specified, the SO Rep shall be allowed to withhold 15% of the payment of any sums due to the Contractor in relation to the execution of such Works, subject to the minimum sum of S$5,000 per Deed of Warranty. However, such sums withheld shall be released to the Contractor upon submission by him of the duly executed Deed of Warranty.

73.21 LAMINATED SAFETY GLASS FOR FIXED PANELS BELOW CILL HEIGHT 73.21.1 Material Requirements All glazing to the fixed panels below the cill height, described under this clause

including all subclauses under it, shall be of 12.76 mm laminated safety glass units comprising of 6 mm thick tinted float glass and 6 mm thick clear float glass cemented together with 0.76 mm thick clear polyvinyl butyral (PVB) interlayer with glazing gaskets and a shading co-efficient of 0.69, where shown in the Drawings. The tint of the glazing shall be the same as those of the remaining glass panels when viewed from the external and inner surfaces of the glass. The laminated safety glass shall be of Grade A and shall comply with the relevant requirements in SS 341:2001. The safety glazing shall pass the impact test and boil test in accordance with SS 341:2001 and other requirements all as specified hereunder :

(a) Impact Test The glazing material tested in accordance with Annex A of SS 341:2001 shall

comply with the requirements for breakage given in Annex A. (b) Boil Test When tested in accordance with Annex C of SS 341:2001, the glazing material

itself might crack, but no bubbles or other defects shall develop more than 12 mm from the edge of the test specimen or from any cracks that have developed.

BSS S73 73-42 of 73-57


73.21.1 Material Requirements (Cont’d) (c) Flatness Of Glazing Panels The flatness of panels shall be within the following limits : (i) Localised warp 1.0mm over any 200mm span; (ii) Overall bow and warpage shall be in accordance with Table 3 “Flatness

Limits for Glass of Standard Nominal Thickness” of SS 341:2001. (d) Squareness Of Rectangular Panels The squareness of rectangular panels shall be such that the difference

between the two diagonals does not exceed 5mm for panels where the largest dimension is less than 1200mm and does not exceed 10mm for all other panels.

(e) Size Tolerances The tolerances on size of safety glass shall be as specified in Table 2 “Size

Tolerance for All Safety Glass” of SS 341:2001. (f) Thickness Limit For Safety Glass The thickness limit shall comply with Table 1.1 “Thickness limits for standard

nominal thickness of glass” of SS 341:2001 73.21.2 Design Loads The laminated safety glass panels shall comply with the Building Regulations

requirements - "Fourth Schedule for Parapets And Balustrades, Table 4". The laminated safety glass panels shall be designed to resist the loads stipulated in the said Fourth Schedule for Parapets And Balustrades, Table 4.

73.21.3 Professional Engineer's Calculations The Contractor shall submit his Professional Engineer's calculations for the design of

the laminated safety glass fixed panels and the aluminium framing for the fixed panels, to show compliance with the lateral load requirements of the Building Regulations.

73.21.4 Workshop Drawings And Samples The Contractor shall submit complete workshop drawings for all glazing and

aluminium Works with PE calculations and endorsement for the approval of the SO Rep prior to its fabrication and installation. Complete samples shall be installed at the Site for approval by the SO Rep.

73.21.5 Replacement In the event of damage arising from breakage, chips and delamination, replacement

shall be immediately carried out all at the cost and expense of the Contractor.

BSS S73 73-43 of 73-57


73.22 TIMBER STRIP FLOOR AND TIMBER SKIRTING 73.22.1 General Provide and lay timber strip flooring with matching timber skirting to all bedroom

floor areas. In addition, supply and lay timber skirting to living, dining areas where glazed ceramic floor tiles are laid. Timber skirting colour and tone are to match timber strip floor. All timber strip flooring shall be finished with varnish of semi-gloss or other approved finish as selected by the SO Rep.

The type of timber strip referred to in this clause shall be teak or other approved

hardwood. Samples shall be provided to the SO Rep for approval. The SO Rep shall have absolute prerogative in his selection and no addition to the contract sum shall be made for the differences in cost arising from different sources of the timber strips. The laying pattern shall be as approved by the SO Rep.

73.22.2 Technical Specifications On Materials 73.22.2.1 Timber Strip And Skirting (a) Dimension and dimensional tolerance Dimension of each piece of timber floor strip shall be 300mm long, 50mm wide

and 12mm thick. The skirting shall be 1200mm long x 95mm X 12mm thick. Average dimension of each timber strip and skirting shall not deviate by more than + 2 mm from the specified size. Each strip shall be machined cut to form 2.5mm x 3mm and 4mm x 4mm tongue-and-groove interlock. Allow for adjustment in skirting height to match site requirements.

(b) Moisture Content Timber skirting and floor strip delivered to site shall be ‘kiln dried’ to a moisture

content not exceeding 15% at the time of installation and an average moisture content of 10% to 14% when ‘dried out’.

73.22.2.2 Adhesive

Adhesive to be used for the laying of timber strips shall be in accordance with

manufacturer’s recommendations and be able to develop a minimum adhesion bond strength of 0.87 N/mm2 when tested in accordance with “Determination of Adhesion Resistance of Coating” adopted from ASTM D 4541:1993.

73.22.2.3 Varnish

The varnish shall be abrasion resistant, heat resistant and non-cracking. When the varnish is tested in accordance with “Determination of Abrasion Resistance of Coating (via BYK Garden Abrasion Tester)” adopted from SS 5 : Part F5 : 1992, the weight loss shall not exceed 0.03gm after 400 double-stroke of abrasion cycles.

BSS S73 73-44 of 73-57


73.22.3 Workmanship

73.22.3.1 General

The Contractor shall sort out timber strips and skirtings prior to laying and installation so as to prevent inconsistent dark and light patches on the finished timber floor and skirting. Timber floor and skirting shall be even, level and consistent in finish. The finished varnishes are to be uniform in appearance and to the satisfaction of the SO Rep.

73.22.3.2 Pre-Packed Mortar Screed

Before laying the floor screed, prepare the concrete surface by cleaning and damping slightly and remove all droppings, stains and foreign materials. Approved factory pre-packed dry mixed mortar screed shall only be used for the floor screed. The pre-packed mortar must be mechanically mixed with the right amount of water specified by the manufacturer. The Contractor shall arrange with the SO Rep for checking that screed is not hollow and floor screed is level (can allow a tolerance of up to 3mm difference in level for every 3m) before timber strip floor laying can properly commence. Completed screed must be allowed to cure and dry for a minimum of 14 days and there shall be no shrinkage or crack prior to the installation of timber flooring. Minimum thickness of screed shall be 15mm or as shown in the Drawings.

73.22.3.3 Application Of Adhesive

The timber floor shall be glued onto the screeded floor with approved and suitable adhesive. It shall then be allowed to cure for a minimum of 14 days. Adhesive shall be mixed and applied in accordance with the manufacturer’s instruction with application coverage and thickness to comply so as to achieve good bond quality. The adhesive must be stirred before application and stored in closed container to prevent drying out and contamination.

73.22.3.4 Sanding

The timber floor shall then be sanded using a sanding machine. There shall be a minimum of 3 levels of sanding to the satisfaction of the SO Rep. No cost adjustment to the contract sum shall be made for additional levels of sanding.

73.22.3.5 Varnishing

Prior to varnishing, the timber strip surface shall be thoroughly cleaned and dried, with all debris, sand and saw dust removed. Suitable fillers must be used if there are imperfections. Either water or oil based fillers can be used provided they are sufficiently dried (at least overnight) before application. The floor shall be finished with three coats of varnish to SO Rep’s approval. Between each coating, the timber strip flooring shall be sanded to remove any unevenness and thoroughly cleaned before the application of further coats. The varnished paint shall be prepared by adding hardener to the base while stirring and the mixture must be stirred thoroughly before application. Mixing ratio shall be 10 parts base and 1 part hardener (by volume). Coverage of varnishing coat during each application shall be done in accordance with the manufacturer’s instruction. Minimum interval between each coat of application is 12 hours.

BSS S73 73-45 of 73-57


73.22.3.6 Installation Of Timber Skirting

The skirting shall be delivered to site sanded and varnished with two coats for installation on site. Skirting shall be fastened to walls with approved hidden T-nails and the same nail holes shall be patched up and varnished with the final varnishing coat.

73.22.4 Storage And Protection

All timber strips and skirtings shall be stored and protected from weather in a clean and dry area. The Contractor shall provide temporary protective material to cover the finished timber floor to protect it against damage, dents, scratches, stains and droppings. Protective material shall be sufficiently thick, impermeable to water and non-staining in wet and dry condition. It shall be tough so that it cannot be torn or punctured easily on site. The protective material shall be provided after the final varnished coat has sufficiently cured and dried. Between this drying and curing period, contractor is to ensure that the completed varnished floor in the room is blocked out. Contractor is also to carry out regular checking and maintenance to ensure protection is always firmly in place. Protective material must not be removed until such time that all works have been completed and building block is ready for handover.

73.22.5 Damage And Replacement

In the event of any damage to the flooring, the Contractor shall immediately make all repairs and replacements necessary up to the satisfaction of the SO Rep at the Contractor’s cost and expense.

73.22.6 Workshop Drawings And Sample

The details shown in the Contract Drawings shall serve only as a guide. Provide complete sets of workshop drawings showing the laying patterns of timber strip flooring. The workshop drawings shall include plans, elevations, detailed sections and other relevant details required by the SO Rep. These workshop drawings shall be submitted to the SO Rep for approval. Further, a complete sample shall be installed on site for the approval of the SO Rep before full implementation.

BSS S73 73-46 of 73-57


73.23 GLAZED PORCELAIN CERAMIC FLOOR TILES 73.23.1 General (a) Location and Extent

Provide and lay glazed porcelain ceramic floor tiles to living room, dining room and to any other locations shown in the Drawings. The glazed porcelain ceramic floor tiles shall conform to all the requirements as specified in this clause. The pattern range shall be “Marble” or “Big Grain” or other approved pattern range. Provide a full range of colours and patterns of floor tiles for selection and approval by the SO Rep.


In the event that the ceramic floor tiles delivered to the Site are inconsistent in sizes but fall within the allowable tolerances as specified in this Clause including all subclauses under it, the tiles shall be sorted out into separate groups of compatible sizes to the satisfaction of the SO Rep. Tiles of one size group shall be laid in one area separate from tiles belonging to other size groups.

73.23.2 Approved Glazed Porcelain Ceramic Floor Tiles The type of glazed porcelain ceramic floor tiles provided by the Contractor as specified

in this clause shall be subject to the approval of the SO Rep. The SO Rep shall have the absolute prerogative to select the type of tiles from the list of approved glazed porcelain ceramic floor tiles as specified and no adjustment to the Contract Sum shall be made.

73.23.3 Testing Requirements (a) Test Samples And Methods

All test samples shall be randomly chosen from the same batch of delivery by the SO Rep. The test methods shall be in accordance with SS 483:2000 ( Annex G) unless otherwise stated.

(b) Test Certificates And Compliance Requirements

Provide test certificates by a testing laboratory accredited under SINGLAS to cover the tests mentioned in this Clause.

BSS S73 73-47 of 73-57



shall be accordance with the following :- (a) Dimensions The dimensions shall be as follows : Nominal Length : 450mm Nominal Width : 450mm Thickness : 10mm or Nominal Length : 500mm Nominal Width : 500mm Thickness : 10mm The dimensional tolerances shall be as follows :

(i) Length : Average length of each tile shall not deviate by more than ±1.0mm from the average length of 10 test specimens.

(ii) Width : Average width of each tile shall not deviate by more than ±1.0mm from the average width of 10 test specimens.

(iii) Thickness : Average thickness of each tile shall not deviate by more than± 1.0mm from the average thickness of 10 test specimens.The average thickness of each tile shall not be less than9mm.

(iv) Straightness OfSides

: Maximum deviation of each tile shall not exceed 1.0mm ofthe work size.

(v) Rectangularity : Maximum deviation of each tile shall not exceed 1.0mm ofthe work size.

(vi) Flatness of Surface

: Maximum centre curvature of each tile shall not exceed 1.5mm of the length of the corresponding diagonal calculated from the work size. The maximum edge curvature of each tile shall not exceed 1.5mm of the work size. The maximum warpage of each tile shall not exceed 1.5mm of the length of the corresponding diagonal calculated from the work size.

(b) Surface Quality The tiles shall be free from objectionable surface blemishes such as projections,

depressions, flakes, hairline cracks and bubbles. The tiles shall be level and regular in size with properly formed corners and shall not be warped or deformed in any manner.

BSS S73 73-48 of 73-57


73.23.4 Technical Specifications (Cont’d) (c) Physical properties

(i) Water Absorption : Shall be a maximum of 0.5%

(ii) Modulus Of Rupture : Minimum average strength shall not be less than 35 N per sq.mm.



(d) Chemical properties

(i) Staining Test : The procedure for carrying out the test is as follows : Allow 3 or 4 drops of each of the test solutions (Methylene blue solution, 10g/L and Potassium permanganate solution, 10g/L), to fall on a fresh part of the test specimen. Place an approximately 30mm diameter convex watch glass on the applied drop in order to spread it to an approximately circular area. Allow to remain for 24 hours and then rinse the surface with running water and wipe with a damp cloth. If a stain remains, thoroughly clean with a solution of the standard cleaning agent. Performance Criteria The stain test result shall be as follow : 1) Methylene Blue : Class 1 2) Potassium Permanganate : Class 2 Where;Class 1= Stain removed by water; Class 2= Stain removed by cleaning agent.

(ii) Resistance to household chemicals

: Minimum GB

(iii) Slip Resistance : The Slip resistance test method shall be in accordance with SS 485:2001. The test shall be conducted under dry condition using dry floor friction test method with a coefficient of friction of minimum 0.4.

73.23.5 Laying Of Floor Tiles Laying of floor tiles shall be in accordance with clause 19.5.6 “Laying Of Ceramic Floor

Tiles”.

BSS S73 73-49 of 73-57


73.23.6 Timber Skirting Supply and lay timber skirting to living, dining areas and to any other locations where

glazed porcelain ceramic floor tiles are laid. The timber skirting shall be “Teak” or “Nyatoh” or other approved hardwood. Sample of timber skirting shall be submitted for the SO Rep approval. Skirting shall be sanded smooth and varnished with 2 coats before delivered to Site for installation. Nail holes shall be properly patched up prior to the application of final varnishing coat.

BSS S73 73-50 of 73-57


APPENDIX B1

DEED OF WARRANTY FOR POWDER COATED EXTRUDED ALUMINIUM FRAMED WINDOWS, OPENABLE WINDOWS, VENTS, FIXED GLASS PANELS,

ALUMINIUM SWING DOORS AND ALUMINIUM FRAMED SLIDING DOORS To: Housing & Development Board Republic of Singapore

S T A M P If stamp duties required

_______________________________________

_______________________________________

_______________________________________

CONTRACT NO. ________________

WHEREAS : (1) _______________________________________________________________

(Name and Address of Contractor)

_____________________________________________________________________ (hereinafter called the "Contractor") is the contractor of the Housing & Development Board (hereinafter called the "Employer") in respect of the above contract works (hereinafter called the "Contract"). (2) _______________________________________________________________

(Name and Address of Specialist)

_____________________________________________________________________ (hereinafter called the "Specialist") is the specialist engaged by the Contractor in respect of Powder Coated Extruded Aluminium Framed Windows, Openable Windows, Vents, Fixed Glass Panels, Aluminium Swing Doors And Aluminium Framed Sliding Doors (hereinafter called the "Works") required under the Contract with the consent of the Employer given at the request of both the Contractor and the Specialist. (3) Pursuant to Clause ______________ of ______________________________ of the Contract the Contractor is obliged and has agreed to give this Warranty.

BSS S73 73-51 of 73-57


APPENDIX B1 Page 2 In consideration of the premises and of the Employer giving the consent aforesaid at the request of the Contractor and the Specialist, the Contractor and the Specialist agree with the Employer as follows : 1 The Contractor and the Specialist jointly and severally warrant for a period of ten (10) years (hereinafter called the "Warranty Period") that the Works shall remain free from defects, including but not limited to blistering, algae growth, uneven fading, discolouration, peeling, warping and chalking. The Warranty Period in respect of the Works shall commence from the Date(s) of Substantial Completion of the Contract as certified by the Superintending Officer of the Contract. 2 The Contractor and the Specialist jointly and severally further warrant that: (a) they have exercised all proper skill and care in the selection of materials and

goods for the Works; (b) they have exercised all proper skill and care in the design and execution of the

Works; (c) their workmanship is of a standard that may be expected from a contractor with

specialised experience and expertise in his particular trade; and (d) the Works are fit and suitable for the purpose designed and required in the

Contract. 3 It is an express term of the Warranty that the Works when completed and the goods or materials used shall meet the Performance Requirement of the Contract in respect of the Works. ln the event the Works when completed and/or the goods and materials used should fail to meet such Performance Requirement, the Contractor and the Specialist shall be precluded from disclaiming liability under the Warranty on the ground that the Works as completed and/or the goods and materials used accord or comply with the Contract, and in this connection, the Contractor and the Specialist are deemed to have waived this defence in the event a claim is made by the Employer against them in respect of their breach of the Warranty. 4 Subject to Clauses 5 and 9 below, if any damage or defects should occur in relation to the Works within the Warranty Period due to whatever cause, the Contractor and the Specialist jointly and severally undertake to remove and/or rectify and make good such damage or defects including ancillary works within a reasonable period or duration specified by the Employer's notice in writing. If such damage or defects are attributable to the Contractor's or Specialist's breach of warranty under Clause 2 above, then the cost of such removal rectification and/or making good work shall be borne by the Contractor and/or Specialist. If the Contractor and/or Specialist shall fail to comply within the period or duration specified, it shall be lawful for the Employer to order such damage or defects as are referred to in such notice to be removed, rectified and/or made good by any other person and recover from the Contractor and/or Specialist such cost and expense incurred for which they may be liable. PROVIDED ALWAYS that such instructions shall be issued without prejudice to the Employer's right to recover damages against the Contractor and/or the Specialist by reason of their failure to comply with this Clause.

BSS S73 73-52 of 73-57


APPENDIX B1 Page 3 5 In the event such damage or defects are caused wholly or in part by the Employer or a third party, and the Contractor and Specialist are required under Clause 4 above to remove, rectify and/or make good such damage or defects including ancillary works within the period or duration specified by the Employer's notice in writing, then upon completion of such work, the Employer shall pay the Contractor and Specialist for the work or that part of the work which the Employer's Chief Executive Officer or at the discretion of the Chief Executive Officer, a person nominated by him in writing may determine as occasioned by damage or defects caused by the Employer or third party, and the valuation of such work or such part of the work shall be ascertained in accordance with one or a combination of the methods mentioned below in descending order of priority : (a) by measurement and valuation at fair market rates and prices; or (b) if the above method is not applicable, then the valuation shall be based on the

actual cost of necessary materials or goods, labour, Construction Equipment and equipment (other than ordinary plant) plus 15% which percentage shall include the use of all ordinary plant, tools and supervision, overheads and profits.

6 The approval by the Employer of any works required under Clauses 4 or 5 above does not absolve the Contractor and/or the Specialist from their responsibility to rectify future occurrence of defects in respect of such works. 7 It is a term of this Warranty that the Contractor and/or the Specialist shall indemnify the Employer against all loss damage cost and expense suffered or incurred by the Employer in relation to any damage to property or injury to person caused or occasioned by the acts or omissions of the Contractor's and/or the Specialist's employees, representatives or workmen in the course of the works undertaken under the terms of this Warranty. The Contractor and/or the Specialist shall at their own cost and expense effect and maintain a Public Liability Insurance Policy for the execution of such works. 8 The Contractor and/or the Specialist shall indemnify the Employer against any compensation payable by the Employer under the Workmen's Compensation Act Cap 354 (1985 Edition) in connection with any accident arising out of rectification works undertaken by the Contractor and/or the Specialist pursuant to the provisions of this Warranty. The Contractor and/or the Specialist shall at their own cost and expense effect and maintain a Workmen's Compensation Policy for the execution of such works. 9 This Warranty shall not be invalidated in the event another person is instructed to execute the rectification work on account of the Contractor's and/or the Specialist's failure to discharge their obligations under Clauses 4 and 5 above, nor shall this Warranty be invalidated in the event a third party is engaged without the consent of the Contractor and/or the Specialist to carry out regular maintenance and cleaning of the Works, provided that in the latter event, any rectification work or part thereof undertaken by the Contractor and/or Specialist that is occasioned by the negligence of such third party shall be valued in the manner described in Clause 5 above and paid by the Employer.

BSS S73 73-53 of 73-57


APPENDIX B1 Page 4 10 All differences and/or disputes arising under this Warranty (including questions relating to interpretation) shall be determined by the Employer's Chief Executive Officer or at the discretion of the Chief Executive Officer, by a person nominated in writing by him. Any decision by the Chief Executive Officer or his nominee under this Clause shall be final and binding on and conclusive against the Contractor and/or the Specialist in any proceedings that may arise under this Warranty unless otherwise determined by the Court in respect of proceedings arising under this Warranty. 11 This Warranty shall remain valid and shall not be affected by any extensions, variations or compositions granted or entered into with respect to the terms of or obligations under the Contract. 12 This Warranty shall be read together with the Contract but in case of any conflict between the two documents the provisions of this Warranty shall prevail. 13 The validity, construction and interpretation of this Warranty and all rights, obligations and liabilities arising hereunder shall be governed by, and interpreted in accordance with, the laws of Singapore. 14 The Employer shall have the absolute discretion to assign the benefit of this Warranty to any third parties without the consent of the Contractor and/or the Specialist. IN WITNESS WHEREOF we have hereunto set our hands and seals the

day of 20 .

BSS S73 73-54 of 73-57


APPENDIX B1(TC)

DEED OF WARRANTY FOR POWDER COATED EXTRUDED ALUMINIUM FRAMED WINDOWS, OPENABLE WINDOWS, VENTS, FIXED GLASS PANELS,

ALUMINIUM SWING DOORS AND ALUMINIUM FRAMED SLIDING DOORS To: ___________________________

___________________________ Republic of Singapore

S T A M P If stamp duties required

_________________________________________

_________________________________________

_________________________________________

CONTRACT NO. ____________________ WHEREAS : (1) _______________________________________________________________

(Name and Address of Contractor)

_____________________________________________________________________ (hereinafter called the "Contractor") is the contractor of the Housing & Development Board (hereinafter called the "Employer") in respect of the above contract works (hereinafter called the "Contract"). (2) _______________________________________________________________

(Name and Address of Specialist)

_____________________________________________________________________ (hereinafter called the "Specialist") is the specialist engaged by the Contractor in respect of Powder Coated Extruded Aluminium Framed Windows, Openable Windows, Vents, Fixed Glass Panels, Aluminium Swing Doors And Aluminium Framed Sliding Doors (hereinafter called the "Works") required under the Contract with the consent of the Employer given at the request of both the Contractor and the Specialist. (3) Pursuant to Clause ______________ of ______________________________ of the Contract, the Contractor is obliged and has agreed to give to the ____________________________________________________________________ _____________________________________________________________________ (hereinafter called the "Council") this Warranty.

BSS S73 73-55 of 73-57


APPENDIX B1(TC) Page 2 In consideration of the premises and of the Employer giving the consent aforesaid at the request of the Contractor and the Specialist, the Contractor and the Specialist agree with the Council as follows : 1 The Contractor and the Specialist jointly and severally warrant for a period of ten (10) years (hereinafter called the "Warranty Period") that the Works shall remain free from defects, including but not limited to blistering, algae growth, uneven fading, discolouration, peeling, warping and chalking. The Warranty Period in respect of the Works shall commence from the Date(s) of Substantial Completion of the Contract as certified by the Superintending Officer of the Contract. 2 The Contractor and the Specialist jointly and severally further warrant that: (a) they have exercised all proper skill and care in the selection of materials and

goods for the Works; (b) they have exercised all proper skill and care in the design and execution of the

Works; (c) their workmanship is of a standard that may be expected from a contractor with

specialised experience and expertise in his particular trade; and (d) the Works are fit and suitable for the purpose designed and required in the

Contract. 3 It is an express term of the Warranty that the Works when completed and the goods or materials used shall meet the Performance Requirement of the Contract in respect of the Works. In the event the Works when completed and/or the goods and materials used should fail to meet such Performance Requirement, the Contractor and the Specialist shall be precluded from disclaiming liability under the Warranty on the ground that the Works as completed and/or the goods and materials used accord or comply with the Contract, and in this connection, the Contractor and the Specialist are deemed to have waived this defence in the event a claim is made by the Council against them in respect of their breach of the Warranty. 4 Subject to Clauses 5 and 9 below, if any damage or defects should occur in relation to the Works within the Warranty Period due to whatever cause, the Contractor and the Specialist jointly and severally undertake to remove and/or rectify and make good such damage or defects including ancillary works within a reasonable period or duration specified by the Council's notice in writing. If such damage or defects are attributable to the Contractor's or Specialist's breach of warranty under Clause 2 above, then the cost of such removal rectification and/or making good work shall be borne by the Contractor and/or Specialist. If the Contractor and/or Specialist shall fail to comply within the period or duration specified, it shall be lawful for the Council to order such damage or defects as are referred to in such notice to be removed, rectified and/or made good by any other person and recover from the Contractor and/or Specialist such cost and expense incurred for which they may be liable. PROVIDED ALWAYS that such instructions shall be issued without prejudice to the Council's right to recover damages against the Contractor and/or the Specialist by reason of their failure to comply with this Clause.

BSS S73 73-56 of 73-57


APPENDIX B1(TC) Page 3 5 In the event such damage or defects are caused wholly or in part by the Council or a third party, and the Contractor and Specialist are required under Clause 4 above to remove, rectify and/or make good such damage or defects including ancillary works within the period or duration specified by the Council's notice in writing, then upon completion of such work, the Council shall pay the Contractor and Specialist for the work or that part of the work which the Council's Chairman or at the discretion of the Chairman, a person nominated by him in writing may determine as occasioned by damage or defects caused by the Council or third party, and the valuation of such work or such part of the work shall be ascertained in accordance with one or a combination of the methods mentioned below in descending order of priority : (a) by measurement and valuation at fair market rates and prices; or (b) if the above method is not applicable, then the valuation shall be based on the

actual cost of necessary materials or goods, labour, Construction Equipment and equipment (other than ordinary plant) plus 15% which percentage shall include the use of all ordinary plant, tools and supervision, overheads and profits.

6 The approval by the Council of any works required under Clauses 4 or 5 above does not absolve the Contractor and/or the Specialist from their responsibility to rectify future occurrence of defects in respect of such works. 7 It is a term of this Warranty that the Contractor and/or the Specialist shall indemnify the Council against all loss damage cost and expense suffered or incurred by the Council in relation to any damage to property or injury to person caused or occasioned by the acts or omissions of the Contractor's and/or the Specialist's employees, representatives or workmen in the course of the works undertaken under the terms of this Warranty. The Contractor and/or the Specialist shall at their own cost and expense effect and maintain a Public Liability Insurance Policy for the execution of such works. 8 The Contractor and/or the Specialist shall indemnify the Council against any compensation payable by the Council under the Workmen's Compensation Act Cap 354 (1985 Edition) in connection with any accident arising out of rectification works undertaken by the Contractor and/or the Specialist pursuant to the provisions of this Warranty. The Contractor and/or the Specialist shall at their own cost and expense effect and maintain a Workmen's Compensation Policy for the execution of such works. 9 This Warranty shall not be invalidated in the event another person is instructed to execute the rectification works on account of the Contractor's and/or Specialist's failure to discharge their obligations under Clauses 4 and 5 above, nor shall this Warranty be invalidated in the event a third party is engaged without the consent of the Contractor and/or the Specialist to carry out regular maintenance and cleaning of the Works, provided that in the latter event, any rectification work or part thereof undertaken by the Contractor and/or Specialist that is occasioned by the negligence of such third party shall be valued in the manner described in Clause 5 above and paid by the Council.

BSS S73 73-57 of 73-57


APPENDIX B1(TC) Page 4

10 All differences and/or disputes arising under this Warranty (including questions relating to interpretation) shall be determined by the Council's Chairman or at the discretion of the Chairman, by a person nominated in writing by him. Any decision by the Chairman or his nominee under this Clause shall be final and binding on and conclusive against the Contractor and/or the Specialist in any proceedings that may arise under this Warranty unless otherwise determined by the Court in respect of proceedings arising under this Warranty. 11 This Warranty shall remain valid and shall not be affected by any extensions, variations or compositions granted or entered into with respect to the terms of or obligations under the Contract. 12 This Warranty shall be read together with the Contract but in case of any conflict between the two documents the provisions of this Warranty shall prevail. 13 The validity, construction and interpretation of this Warranty and all rights, obligations and liabilities arising hereunder shall be governed by, and interpreted in accordance with, the laws of Singapore. IN WITNESS WHEREOF we have hereunto set our hands and seals the

day of 20 .

Documents

Sengkang N2 C34 S73