Explanatory Notes and Summary of Major Changes

General Specification for Building 2012 Edition The 2012 Edition of the General Specification for Building comprises considerable updating and revisions to the 2007 Edition. The review of the 2007 Edition was carried out by the Technical Information Committee of the Architectural Services Department (ArchSD). Principal amendments and additions in the 2012 Edition include the updating of the BS Standards where applicable, further greening Specification to be in line with the global consciousness for our environment and also some updated requirements in the landscaping practice. The updating of specification is a continuous process. With the benefit of information technology, the electronic version of this 2012 Edition of the General Specification will be kept up-to-date and may be viewed on the ArchSD Homepage. In view of the revisions and new additions, there will be an introductory period of 3 months whereby the General Specification 2003 and 2007 Editions will still be the Contractual Document, whilst the new General Specification 2012 Edition may be viewed in parallel in preparation for full implementation on 19 November 2012.  

Hence, for tenders to be invited on or after 19 November 2012, GS2012 shall be used; Existing contracts (including contracts using GS2003, GS2007 and its Corrigendum No. 1 and No. 2 tendered before 19 November 2012) would not be affected.

GENERAL SPECIFICATION FOR BUILDING 2012 EDITION Major Changes from GS2007 Corrigendum No. GS2007-02 (April, 2011) to GS2012 (November, 2012) Clause No.

Sub-heading of Clause

Major Changes

Section 1 - Preliminaries 1.02

Abbreviations

Add “IEC

International Electrotechnical Commission”

1.04

Form of Contract

Add “Special Administrative Region” after Hong Kong in the first paragraph.

1.06

British Standards The whole section was re-written to be as follows: European Standards and "British Standards", "European Standards" and "Codes of Practice" shall Codes of Practice be deemed to include all amendments, revisions and standards superseding the standards listed herein, current and published before the date of first tender invitation for the Contract unless otherwise specified. In the case of Sections 1, 3, 5, 6, 7, 8, 15, 25 and 26, the stated BS, BS EN, CP and similar standards in Index 3 are to take preference over any later amendment, revision or superseded standard. For the Codes of Practice and Construction Standards issued by the Government of Hong Kong, the latest editions shall apply unless otherwise specified in Index 3. Equivalent International Standards may be used if approved by the SO.

1.07

Specification in Manufacturer’s recommendations

Add “Specification in” in front of the clause sub-heading.

Replace “at the date of tender” at the end of the clause with “and published before the date of first tender invitation for the Contract.” 1.12

Equivalent standards and Replace “BS” with “standards”. imperial sizes

1.25

Access and roads

Change “Highways Authority Department” to “relevant government departments and authorities” (2nd and 3rd paragraph) “Authorisation” change to “Authorization” in second para.

1.26

Drainage

Change “Environmental Protection Department and Drainage Services Department” to “relevant government departments and authorities”

1.27

Watchmen

Last word “licenced” change to “licensed”.

1.32

Screens

Replace “Environmental Protection Department” government departments and authorities”.

1.36

Water

“BS 3148”change to “BS EN 1008 ”

1.39

Maintenance of Temporary Works

SPECIAL TEMPORARY WORKS (DOUBLE LAYER SCAFFOLD) change to “TEMPORARY WORKS (SCAFFOLD SYSTEM)”

1.39.1(i)

General

“catch fans” change to “catch-fans in (i).

1.39.1(ii)

with

“relevant

In (ii), “scaffolding system” change to “Scaffold System” in line 1, “slope” change to “sloping” in line 4, “shall be metal” change to “shall be of metal construction” in last

-1-

sentence. In (iv), add “and subject to approval by the SO” after “Unless otherwise specified”.

1.39.1(iv)

1.39.2(i) (ii)

Codes and standards

Delete “the” in (i) and (ii) respectively.

1.39.2(viii)

Delete “:2005” and Buildings “Authority” change to Buildings “Department” in (viii).

1.39.2(ix)

After “Code of Practice ….2004”, add “, issued by the Buildings Department” in (ix).

1.39.2(x)

“British” Standard change to “European” Standard in (x). Delete “5973” and “Code of Practice for Access and Working Scaffolds and Special Scaffold Structure in Steel “. Add “BS EN 12811-1 – Temporary Works Equipment – Part 1: Scaffolds – Performance requirements and general design together with TG20.08 – Technical guidance on the use of BS EN 12811-1 and”

1.39.2(xi)

Replaced ‘Falsework’ with ‘Temporary Works Procedures and the Permissible Stress Design of Falsework’ in (xi) Delete clause (xii) “British Standard 1139…” Rewrite the original para to the following: “The Guidelines on the Design and Construction of Bamboo Scaffolds, issued by the Buildings Department, shall also be complied with while the CPFBSS takes preference. Materials for metal Scaffold System shall comply with the following standards or other equivalent national / international standards approved by the SO : (a) (b) (c)

(d)

(e)

(f)

(g)

1.39.3

Submissions

BS 1139 - Metal Scaffolding Part 1.2, Part 2.2, Part 4 and Part 6. BS EN 39, Loose steel tubes for tube and coupler scaffolds. Technical delivery conditions. BS EN 74-1, Couplers, spigot pins and baseplates for use in falsework and scaffolds – Part 1: Couplers for tubes – Requirements and test procedures. BS EN 74-2, Couplers, spigot pins and baseplates for use in falsework and scaffolds – Part 2: Special couplers – Requirements and test procedures. BS EN 74-3, Couplers, spigot pins and baseplates for use in falsework and scaffolds – Part 3: Plain base plates and spigot pins – Requirements and test procedures. BS EN 1004, Mobile access and working towers made of prefabricated elements – Materials, dimensions, design loads safety and performance requirements. BS EN 12810-1, Façade scaffolds made of prefabricated components – Part 1: Products specifications.

Add “Working drawings for the Scaffold System as per Clause 1.39.4 of this Section shall be submitted with the method statement;” at last in (b). Add “(c) For any portion of the Scaffold System which cantilevers up from the top floor under construction, the method statement shall include adequate tie and strut arrangement for the cantilevered portion”.

-2-

Original clause (c) change to (d). 1.39.4

Design requirements

Add “overstressing, instability,” after “…construction without causing”, and Add “Scaffold System or the supporting” before “structure” in (i). (ii) rewrite to the following: “For any segment of the Scaffold System exceeding 15 m in height or if the bamboo Scaffold System does not confirm with the prescribed types of scaffolding in the CPFBSS or the Guidelines on the Design and Construction of Bamboo Scaffolds issued by the Buildings Department, the whole Scaffold System shall be designed and approved by a registered professional engineer who shall have adequate relevant experience. Working drawings for the Scaffold System shall be prepared, checked and endorsed by the registered professional engineer for submission to the SO.”

1.67

Conducting of compliance tests and surveys on site

In second para, “Surveys conducted on site shall be carried out by a Surveyor with the prior approval of the SO.”, “subject to” instead of “with”.

Annex

Scaffolding Drawing

The three drawing have been revised.

Section 2 - Demolition, Site Clearance & Alterations 2.01

Regulations, Ordinances, Add “s” to Building in (i). Codes of Practice & Delete “The” before “Factories and Industrial” in (x). Practice Notes Delete “The” before “Factories and Industrial” in (xi). Delete “The” before “Factories and Industrial” in (xii). Delete “The” before “Factories and Industrial” in (xiii). Change “Regulations” to “Regulation” in (xiv). Change “Regulations” to “Regulation” in (xv).

2.03

Registered Structural Engineer

Replace “as stipulated in ETWB Technical” with “as stipulated in DEVB Technical”.

2.25

As-built Records

Replace “boundary of the site with chain-link fence” with “boundary of the site with fencing”.

2.43

Asbestos removal

Add new provision “Specified notification forms about the commencement of the asbestos abatement work shall be submitted to the Environmental Protection Department and the Labour Department 28 days in advance.”

2.46

Glove bag method

Delete the original clause, and rewrite this clause to be “The use of glove bag method for the removal of asbestos-containing materials shall be included in the asbestos abatement plan with prior approval by the Environmental Protection Department and the SO.”

2.50

Minimisation of fibre release

Add two paragraph of provisions: “Full containment method shall be applied to the removal works of friable asbestos materials. Smoke test shall be conducted by a registered asbestos consultant before the commencement of asbestos removal works to ensure the integrity of the full containment. Sufficient negative pressure shall be maintained during the removal works. “ “Breakage of asbestos material should be minimized during removal works.”

-3-

2.52

Air monitoring

Add one paragraph of provision as follows: “Personal air samples shall be taken for the worker carrying out asbestos removal work. A reading of less than 0.2 fibre/ml shall be required for the removal works of amosite / crocidolite. For removal works of other types of asbestos materials, the reading shall not exceed 0.5 fibre/ml.” Change “A reading of less than 0.01 fibre/ml will be required in the penultimate and final clearance air sample analysis.” to be “A reading of less than 0.01 fibre/ml will be required in the penultimate / final clearance / reassurance air sample analysis to ensure the site cleanliness after asbestos removal works.”

Section 3 - Excavation and Earthwork 3.03

Record survey

“DEVB” instead of “ETWB” in line 2 of last para.

Section 5 - Piling Work 5.01(xi)

General

A new clause (xi) added: “The following works specified in the Contract shall be carried out by an independent Ground Investigation Contractor from Group I or Group II of the List of Approved Suppliers of Materials and Specialist Contractors for Public Works – Ground Investigation Field Work Category: (a) site borings to pre-determine the piles founding levels in accordance with Clause 5.19; (b) pre-drilling for determination of pile length or to establish bedrock level; (c) core drilling; (d) proof drilling; (e) other works as instructed by the SO.”

5.02(iv)(a)

Design submission

Delete “2004”.

5.04

Loading capacity of piles In last paragraph, “permanent” change to “working”.

5.18(v)

Steel 'H' piles

Delete “2005” in last paragraph.

5.25(ii)(a)

Pile caps tie beams and dowel bars

Delete “2004”in first paragraph.

5.25(c)

“at least 25%” change to “between 25% and 35%”.

Section 6 - Structural Concrete Work 6.12

Minimum periods before In table 6.1, add “GGBS or PFAC” after “Concrete without PFA” in 2nd striking and 3rd column respectively.

6.20

Fixing of reinforcement

Add “Unless otherwise specified, the permitted tolerances for fixing reinforcement shall be in accordance with Code of Practice for Structural Use of Concrete issued by the Buildings Department.”at the end.

6.24

Reinforcement connectors

Delete “2004” in line 4.

-4-

6.25.1

Epoxy coatings to reinforcement

“BS 7295:Part 1 & 2:1990” change to “BS 7295-1 & BS 7295-2”. “BS 7295:Part 1:1990” change to “BS 7295-1”.

6.25.4(d)

6.25.10 (ii)

Document and test “BS 7295-: Part 2: 1990” change to “BS 7295-2”. results to be supplied by the manufacturer Testing of epoxy coating “BS 3900: Part C5:1992” change to “BS 3900: Part C5”.

6.25.10(iii)

“BS 7295:Part 1:1990” change to “BS 7295-1”.

6.25.11(iii)

Compliance criteria: epoxy coatings to reinforcement

“BS 7295:Part 1:1990” change to “BS 7295-1”.

6.26

Generally

Delete “2004” in line 2.

6.29.1

CSF

“BS EN 13263” change to “BS EN 13263-1”.

6.29.2

GGBS

Delete “BS 6699 or”. Add “except that the scheme for the evaluation of conformity of GGBS specified in BS EN 15167-2 is not required. The glass content as determined by X-ray diffraction or optical-microscopy method shall be not less than 67%. The X-ray diffraction method detailed in Appendix D of BS 6699 is acceptable.” After “BS EN 15167-1”.

6.30

Use of PFA, PFAC, CSF “PFA can only be used in combination with Portland cement. Triple and GGBS blending of cement, PFA and GGBS shall not be allowed unless approved by the SO.” rewrite to “PFA shall not be used in addition to PFAC and GGBS shall not be used in combination with PFA or PFAC.” Add “cementitious” before “materials” in line 2 of para 2.

6.30(c)

Delete “GGBS shall not be used together with PFA.”. “PFA concrete shall be used in all pile caps and…” change to “Either PFA or GGBS shall be used in concrete of all pile caps and…”.

6.33

Aggregates

Rewrite the sentence to “Aggregates shall be obtained from a source approved by the SO. Aggregates from marine source and all-in aggregates shall not be used.” Add a new paragraph as follow: Coarse aggregate for concrete shall consist of clean, hard, durable crushed rock to BS 882. The grading shall lie within the limits given for the appropriate nominal size in Table 6.3 unless otherwise agreed by the SO. “BS 812” change to “BS 812-105.1”. Last paragraph “Aggregates shall be inert to alkali-silica reaction (ASR) unless a control framework installed to guard against occurrence of ASR in concrete structures” change to “The potential alkali-reactivity category of coarse aggregate and fine aggregate shall be determined from the results of tests on potential alkali-reactivity of aggregates using the test method given in CS1. Aggregates in the “Reactive” category shall not be used unless with the prior approval of the SO.”

-5-

6.34

Grading of aggregate

“BS 812” change to “BS 812-103.1”.

6.35

Water

“BS EN 1008” instead of “BS 3148”.

6.36

Admixtures and additives “BS 5075:Part 1” change to “BS 5075-1”. “BS 5075:Part 3” change to “BS 5075-3”.

6.42.1

Submission

6.42.1(xv)

6.42.2

6.42.2(iii) 6.47.1(i)

“A certificate not older than 6 months for CSF and GGBS showing that they comply with the requirements stated in the Contract.” change to “A certificate not older than 6 months for each type of cement, PFA, CSF and GGBS showing the source and name of the manufacturers of the materials and showing that they comply with the requirements stated in the Contract. The certificate for GGBS shall include results of tests for:” Add the following: 7-day and 28-day activity indexes of a 50% combination of the GGBS with 50% of test cement, determined in accordance with BS EN 15167-1. The test cement shall conform to BS EN 197-1 and shall be subject to the following restrictions: • It shall be a type CEM I, of strength 42.5N or higher; • The Blaine fineness shall be at least 300 m2/kg; • The tricalcium aluminate shall be between 6% and 12%; and • The alkali content (expressed as equivalent Na2O) shall be between 0.5% and 1.2%. Initial setting time of a 50% combination of the GGBS with 50% of test cement; Initial setting time of the test cement and its 7-day and 28-day strength; Chemical oxide composition of the GGBS, comprising the contents of calcium oxide (CaO), silicon dioxide (SiO2), aluminium oxide (Al2O3), magnesium oxide (MgO), titanium dioxide (TiO2) and manganese oxide (Mn2O3); Total content of alkalis determined in accordance with BS EN 1962, or other method agreed by the SO, and expressed as equivalent Na2O; Fineness value determined in accordance with the air permeability method in BS EN 196-6; Relative density determined in accordance with BS EN 196-6; Glass content and the method used for its determination; and The method(s) of rapid cooling used to produce the granulated blastfurnace slag(s) during the manufacture of the GGBS (Rapid cooling includes quenching in water (granulation) and projecting through water and air (pelletisation)).

Liquid retaining structures

“For liquid retaining structures, PFA shall be used and shall constitute 25% or above of the total cementitious content in the designed mix concrete and shall satisfy the following requirements” change to “For liquid retaining structures, PFA or GGBS shall be used and the PFA content if used shall constitute 25% or above of the total cementitious content in the designed mix concrete. The mix shall also satisfy the following requirements”. “440” change to “450”.

Measures to control ASR Delete “Prevention of Alkali Silica Reaction in Concrete” (available for in concrete downloading from CEDD website). Alternative measures may be submitted to the SO for approval. The SO is not obliged to accept any alternative measures, especially if a measure could limit the performance

-6-

or use of the structure, or necessitate follow-up actions such as monitoring”. 6.47.1(ii)

“Clauses 6.47.2 and 6.47.3” change to “Clause 6.47.2.”.

6.47.1(iii)

“with the prior approval of the SO, the reactive alkali content of the concrete, expressed as the equivalent sodium oxide (Na2O) content per cubic metre of concrete defined in Clause 6.47.2, shall not exceed 3.0 kg.” instead of “otherwise specified, all structures shall be classified as Class 2 in accordance with Section H.2.1 of Appendix H of GEO Report No. 167”.

6.47.2(i)

Equivalent sodium oxide “alkalis” change to “alkali”. (Na2O) content Add “content” after “alkali”. Delete “of GGBS” after “PFA”. Add “or 1/2 of the total alkali content of GGBS (expressed as equivalent Na2O). If the proportion of PFA is less than 20% or that of GGBS is less than 25% of the total cementitious content, the value of B shall be equal to the total alkali content of PFA or GGBS expressed as equivalent Na2O; and” at last.

6.47.2(ii) and (v)

“BS EN 196-2” instead of “BS EN 196-21” respectively.

6.47.2(iii)

“BS 1881:Part 124” change to “BS 1881-124.”.

6.47.2(vi)

"chloride ion” instead of “sodium oxide”. Delete “calculated from the quantity of chloride ion present which shall be” “BS 812-117.” Instead of “BS 812:Part 117” .

6.47.2(iii)(i)(b)

Submission

6.47.2(iii)(i)(c)

Add “content” after “alkali”. “A system” change to “Documentation of a quality system” and delete “and evidence that the control system is covered by the QSPSC certification of the concrete production plant.”. In (ii), “, the calculation shall be submitted to the SO together with supporting HOKLAS endorsed test certificates” change to “the Contractor shall submit the relevant HOKLAS endorsed test certificates and calculations to the SO together with his remedial proposals.”

6.47.2(iii)(iii)

6.52 Table 6.15

Add “during the period of delivery of the approved concrete mix to the Site.” at the end. Curing of concrete

In second last paragraph, add “, GGBS or PFAC” as last sentence. Test method column, “BS EN 196-3” instead of “BS EN 196-3:1995”. “APHA 4500-C1-B, 18th Edition (1992)” change to “APHA 4500-C1B”. “BS EN 1008:2002” change to “BS EN 1008”.

-7-

Table 6.16

In Testing Method column, “BS 812: Section 103.1”change to “BS 812-103.1”, “BS 812: Part 118” change to “BS 812-118”. “BS 812: Section 105.1” change to “BS 812-105.1”. “BS 812: Part 111” change to “BS 812-111”.

6.64

Watertight construction

“3.3kN/m2” change to “3.3kN/m” Add “unless otherwise approved by the SO” before “Construction details such as corners and joints shall be in accordance with the manufacturer's drawings or catalogues.”

Section 7 - Prestressed Concrete Work 7.01

General

Delete “2004”.

Section 8 - Concrete for Minor and Non-Structural Work 8.04

Aggregate

“BS 812-103.1.” instead of “BS 812”.

8.06

Admixtures

“BS 5075-1 & BS 5075-2” instead of “BS 5075: Part 1”

Section 9 - Brickwork and Blockwork 9.01

Generally

“PD6697:2010, BS EN1996-1-2, BS EN1996-2, BS EN1996-3” instead of “BS 5628–3:2001 2005 Current”

9.02

Bricks

“Clay bricks to be well burnt, hard...” in line 1, “shall” instead of “to”. “Brick size to comply with BS 3921, Actual size to be 215 x 102.5 x 65 mm, size to be 225 x 112.5 x 75 mm.” change to “Brick size to comply with National Annex of BS EN 771-1, Table NA.1 with Work size to be 215 x 102.5 x 65 mm and, Coordinating size to be 225 x 112.5 x 75 mm, or other dimensions subject to approval by the SO.”

9.03

Facing bricks

Add “in accordance with ASTM C216-11:” at the end of first sentence. Add “while the individual should not be less than 17.2MPa;” at the end of item 1. “7.9” in line 2 and line 5 change to “7.94” in item 3. Add “a distance of” before “6 meters” In item 4.

9.04

Engineering bricks & loadbearing bricks

“HD Type bricks to BS EN 771-1 and comply with National Annex to BS EN 771-1, Table NA.6” instead of “BS 21”. Delete “:2011”. Class A “70 N/mm2” change to 125 N/mm2 Class B “50 N/mm2” change to 75 N/mm2

9.05

Fire bricks

“BS 3056-Pt. 1” change to “BS 3056-1”

-8-

After BS 1902, add “-3.13 or ISO 12678-2” 9.06

Concrete bricks and blocks

“BS 1998 6073:Pt. 1” change to “BS EN 771-3 & BS EN 772-2” “The average crushing strength of a random selected sample of 10 bricks or blocks to be not less than 7.0 Mpa” change to “The mean compressive strength to be not less than 7.0 Mpa”

9.07

Concrete hollow block

“Same as in Clause 9.06 except that the mean compressive strength” instead of “The average crushing strength of a random selected sample of 10 blocks”,

9.08

Glass blocks

After BS EN 1051-1:2003, add “to a single compressive ...than 6 N/mm² and an average value of not less than 7 N/mm².” Delete “:2003”.

9.10

Damp proof courses

Clause 9.13 change to 9.10 “BS 743” change to “BS 6398, BS 6515 and BS 8215”

9.11

Wall ties

Clause 9.14 change to 9.11 “BS 1243” change to “BS EN 845-1 + A1”

9.12

Cement

Clause 9.15 change to 9.12

9.13

Water

Clause 9.16 change to 9.13

9.14

Sand

Clause 9.17 change to 9.14 “Method” change to “methods” in line 4, second para. “BS 812:Pt. 1” change to “BS EN 932-1, BS EN 932-6 and BS EN 9337”

9.15

Lime

Clause 9.18 change to 9.15 “BS 890” change to “BS EN 459-1”

9.16

Lime putty

Clause 9.19 change to 9.16 “BS 5492” change to “PD CEN/TR 15123:2005, BS EN 13914-2 and BS 8481”

9.17

Plasticiser

Clause 9.20 change to 9.17 “BS 4887” change to “BS EN 934-3”

9.18

Handling

Clause 9.10 change to 9.18

9.19

Storing

Clause 9.11 change to 9.19

9.20

Brickwork & blockwork Clause 9.12 change to 9.20 reinforcement Add “lathing” after “provide expanded metal” in line 1.

-9-

9.22

Proportion

“BS 915” change to “BS EN 14647” in c(ii). Add “, tested to BS 4551:2005+A1 if required by the SO” at the end of the sentence.

9.24

Testing

“BS 5628:Pt.1” change to “PD 6697:2010, BS EN 1996-1-2, BS EN 1996-2 and BS EN 1996-3” ”at last para.

9.25

Use of mortars

Add “brick or block” after “Load-bearing” in item a(v).

Section 10 - Masonry 10.01

Stone

Delete “imported or local” in line 1. Delete “,” after granite in line 1. Add “, to BS EN 771-6” after “…. or appearance” in line 3. “And comply” change to “and shall comply with” in line 3. “BS 5390” change to “BS EN 1996-1-1 + NA to BS EN 1996-1-1, BS EN 1996-2 + NA to BS EN 1996-2, BS EN1996-3 + NA to BS EN 1996-3 and PD6697:2010 when applied to masonry structures. Test methods according to clause 2 of BS EN 771-6.” Delete “Upon the SO’s instruction, the test method for determination of flexural strength of stone shall be to BS EN 12372: 2006”

10.02

Micro conditions of exposure

Add a new clause 10.02 as follow: “Micro conditions of exposure of completed masonry, as in clause 2.1.2.1 and Annex A of BS EN 1996-2 shall be categorized into classes, as follows: MX1 - In a dry environment; MX2 - Exposed to moisture or wetting; MX3 - Exposed to moisture or wetting plus freeze/thaw cycling; MX4 - Exposed to saturated salt air or seawater; MX5 - In an aggressive chemical environment. Masonry units, mortar, concrete infill, ancillary components and reinforcement shall be selected according to Annex B and C of BS EN 1996-2 based on the appropriate class of micro conditions of exposure of completed masonry.”

10.03

Approval of stone

Clause 10.02 change to 10.03

10.04

Mortar

Clause 10.03 change to 10.04. Delete first two words “Material Form” “Clause 9.15” change to “Clauses 9.12 to 9.17 and 9.21”

10.05

Damp proof course

Clause 10.04 change to 10.05 “Clause 9.13” change to “Clause 9.10”.

- 10 -

10.06

Wall ties

Clause 10.05 change to 10.06. “BS 1243” change to “BS EN 845-1:2003 + A1” Delete “not less than 40 mm wide, 3 mm thick and 150 mm long and fanged both ends.”

10.07

Tolerances

Clause 10.06 change to 10.07. In table 10.1, “1” unit of position of plan change to “145”.

10.08

Mock up Sample

Clause 10.07 change to 10.08. “the compliance of…” change to “the compliance or…” in line 2 of second para. Use “the” instead of “particularly of” in line 2 of last para.

10.09

Types of walling

Clause 10.08 change to 10.09. Add “and ashlar” after “Types of rubble” in line 1.

10.10

Preparation of stone for rubble stone walling

Clause 10.09 change to 10.10. In the last sentence of item (a), add “the” before “length” and “height”. Use small letters of “length” in the last sentence of item (a). In item (b) and (c), “Squared” instead of “Square” in line 1.

10.11

Laying and Jointing

Clause 10.10 change to 10.11.

10.12

Random rubble

Clause 10.11 change to 10.12.

10.13

Squared

Clause 10.12 change to 10.13. “Squared” instead of “Square” in the left hand side column.

10.14

Squared rubble brought up to courses

Clause 10.13 change to 10.14. “Squared” instead of “Square” in the left hand side column.

10.15

Squared coursed rubble

Clause 10.14 change to 10.15.

10.16

Squared rubble walling Clause 10.15 change to 10.16. exceeding 300 mm thick “Squared” instead of “Square” in the left hand side column. “Clause 10.15” change to “Clause 10.16” in item (b)(ii). “of” change to “or at least” before “450 mm into the core.” in item (b)(ii).

10.17

Pointing rubble walling

Clause 10.16 change to 10.17.

10.18

Preparation of stone for ashlar walling

Clause 10.17 change to 10.18.

- 11 -

10.19 10.20 10.21 10.22

Laying and jointing ashlar walling Pointing ashlar walling

Clause 10.18 change to 10.19.

Transportation, storage and handling Protection of newly erected stone work

“minimized” instead of “minimize” in line 1.

Clause 10.19 change to 10.20.

Clause 10.21 change to 10.22. “arrises” instead of “arises” in line 1 of para 2. Delete “, such as Portland stone,” in line 3 of para 2.

10.23 10.24

Walling built against concrete, etc Maintenance repair and cleaning

Clause 10.22 change to 10.23. Clause 10.23 change to 10.24. Add “repair and” after “Maintenance” in left hand side column. Add “repair and” after sentence “Two copies of the “Methods of” in line 1. “a” change to “any” in line 1 of last para. Add “repair and” before “cleaning works, reference should be…” in last para. “BS 6270: Part I” change to “BS 8221-2 and BS 8221-1 respectively.” in last para.

Section 11 - Tanking 11.04.01

Proprietary flexible sheet Add “, unless otherwise approved by the SO” after “and the properties of membrane the membrane in lap shear and lap peel shall not be less than 110 kN/m2 and 3.3 kN/m respectively at site condition”

11.04.02

Liquid applied membrane “1.6 kN/mm²” change to “1.6 N/mm²” in line 5. Add “unless otherwise approved by the SO” before the last sentence-“It shall be applied in strict accordance with the manufacturer’s instructions.” “The tear resistance and adhesion…” in line 5 change to “and the tear resistance and adhesion…” Add “unless otherwise approved by the SO.” in line 7.

11.05

Testing of mastic asphalt In Table 11.1, column 1 “Grading of mineral aggregate using BS 410 test sieves “ change to “Grading of mineral aggregate using BS 410:-1, ISO3310-1 & BS410-2, ISO3310-2 test sieves”

Section 12 - Roofing 12.01

Lead

Delete “Code No. 4”.

12.03

Aluminium

“BS EN 485” change to “BS EN 485-1 + A1”.

- 12 -

“BS EN 573” change to “BS EN 573-3”. 12.05

Copper

“CP 143: Pt. 12” change to “CP 143: Pt. 12:1970”.

12.06

Aluminium

Add “shall be” after “Fix sheet aluminium”. “CP 143: Pt. 15” change to “CP 143: Pt. 15:1973”.

12.08

Bitumen felt

“BS EN 13707” change to “BS EN 13707 + A2”.

12.11

Dressing compound

“BS 3690, grade 50 sees” change to “BS EN12591 & BS EN13924”.

12.19

Laying

Delete “in” after “20mm” in line 2, item (b).

12.27

Preparation of base

“Wire brush rust patches on steel sheet roofing.” change to “Use a wire brush to remove rust patches on steel sheet roofing.”

12.35

Surface finish

Add “and” between “clean” and “sharp” in item (a).

12.36

Tiles

Delete “red in colour,” in first line.

12.54

Isolating membrane

“BS 747, Class 4A(i) and weighing not less than 17 kg per roll 25 mm long.” change to “BS EN13707 + A2.”

12.55

Dressing compound

“BS 3690, Grade 25 secs. or other approved grade.” change to “BS EN12591 & BS EN13924”.

12.59

Reinforcement

“BS EN 13658 and not less than 10 mm short way of mesh and not lighter than 0.46 mm thickness.” change to “BS EN 13658-1 & -2”.

12.73

Profiled sheets

“BS 5427” change to “BS 5427-1”

12.75

Fixings

“BS 7371 “ change to “BS 7371-3”

12.76

Generally

“CP 143: Pt. 12” change to “CP 143: Pt. 12:1970”

12.77

Preparing sheets

“Clause 12.03” change to “Clause 21.03”.

12.83

Sheets to curved roofs

Use “to” instead of “shall” after “Sheets required”.

12.89

Profiled glass-fibre reinforced plastic sheets Profiled unreinforced rigid PVC sheets Roofing system

“BS 4154” change to “BS 4154-1 & -2”.

12.92 12.100

“BS 4203” change to “BS 4203-1 & -2”. “Material” change to “Materials” in item (a).

Section 13 - Carpentry and Joinery 13.01

Generally

Delete “:2007”.

13.01.1

Timber for external use

Add “Pine or those cited in Table NA.1 of BS EN 942” after “Approved softwood may be Radiata Pine, and Red or White Pine” in 2nd para in (i). Add “or those cited in Table NA.2 of BS EN 942” after “Approved temperate hardwoods may be Beech or Oak” in (i).

- 13 -

Use “Preservatives shall be environmentally friendly, healthy and safe, acceptable preservatives include Alkaline copper quaternery (ACQ) preservatives to American Wood Protection Association (AWPA) Standards or other suitably approved preservatives. Clear colourless chromate copper arsenic (CCA) to BS 4072 may be used subject to approval by the SO, provided that adequate precautions are taken to avoid injurious to health.” Instead of “.Clear colourless copper chrome arsenic to BS 4072 or other suitable approved preservative.” in (iv). Add “or equivalent authorized certification.” at the end of the sentence in (v). 13.12

Plywood

Delete “to BS 6566 and” in 1st sentence. Use “lauan” instead of “luan” in (ii).

13.13

Marine plywood

“BS1088” change to “BS1088-1”. “4079” change to “BS 1008-2” “Type W.B.P.” change to “Type I”. Add “as in clause 13.29.” at the end of the sentence.

13.14

Blockboard

“Clause 13.12” change to “Clause 13.29”.

13.15

Hardboard

“BS EN 316, BS EN 622-1 and BS EN 622-2.” Instead of “BS 1142. "Standard" (Types SHA, SHB and SHC) or "tempered" (Type THE and THN) as specified”.

13.16

Insulating board

“BS EN 316, BS EN 622-1 and BS EN 622-4” instead of “BS 1142”.

13.17

Wood chipboard

“to BS 5669:Pt. 1 & 2” change to “BS EN 309 and BS EN 312”. “Melamine-faced chipboard shall be to BS 7331:1990” change to “to BS EN 309 and BS EN 312”. “BS 1142:1989” change to “BS EN 316 and BS EN 321”.

13.17.1

Medium Density Fibreboard (MDF) Acoustic tiles

“BS 1142” change to “BS EN 622” in (i).

13.23

Proprietary suspended ceiling systems

In table 13.2, “Components made from aluminium” column, “1996” change to “2007” in (B), (C) and (D) respectively.

13.25

Screws

“BS 1210” change to “AS 1476”.

13.29

Adhesive

“BS EN 204 and BS EN 301.” instead of “BS 1204:Pt. 1” in (a).

13.22

“BS 1142” change to “BS EN 316 and BS EN 622-5”.

“weather-proof and boil-proof (W.B.P.) in BS 1204:Pt. 1.” change to “Type I in BS EN 301 and tested according to BS EN 302” in (b). “type I in BS EN 301” instead of “weather-proof and boil-proof (W.B.P.) in BS 1204:Pts. 1 and 2.” 13.30.1

Wood preservative to external timber

Add “Wood preservative to external timber shall be applied as follow:” as the first sentence.

- 14 -

“BS 8417” instead of “BS 1282:1975” in (ii). “BS 144” instead of “BS 913” in (iv). 13.2

Generally

Clause “13.31.1” change to “13.2”.

13.33

Timber

Clause “13.32” change to “13.33”.

13.34

Dimensions

Clause “13.33” change to “13.34”.

13.35

Framed joinery generally Clause “13.34” change to “13.35”.

13.36

Framed joints

Clause “13.35” change to “13.36”.

13.37

Running bonded joints

Clause “13.36” change to “13.37”.

13.38

Joinery with clear finish Clause “13.37” change to “13.38”.

13.39

Prototypes

Clause “13.38” change to “13.39”.

13.40

Fixing

Clause “13.39” change to “13.40”.

13.41

Nailing

Clause “13.40” change to “13.41”.

13.42

Screwing

Clause “13.41” change to “13.42”.

13.43

Wood preservative

Clause “13.42” change to “13.43”.

13.44

Fixing plastic sheet

Clause “13.43” change to “13.44”.

13.45

Acoustic tiles

Clause “13.44” change to “13.45”.

13.46

Suspended ceilings

Clause “13.45” change to “13.46”.

13.47

Boarded or strip flooring Clause “13.46” change to “13.47”.

13.48

Fixing battens

Clause “13.47” change to “13.48”.

13.49

Infilling between

Clause “13.48” change to “13.49”.

13.50

Wood block flooring

Clause “13.49” change to “13.50”.

13.51

Parquet flooring

Clause “13.50” change to “13.51”.

13.52

Door & frames general

Clause “13.51” change to “13.52”.

13.53

Door with board finish

Clause “13.52” change to “13.53”.

13.54

Ledged and braced

Clause “13.53” change to “13.54”.

13.55

Clause “13.54” change to “13.55”.

13.56

Framed, ledged and braced doors Panelled doors

13.57

Flush doors

Clause “13.56” change to “13.57”.

Clause “13.55” change to “13.56”.

- 15 -

13.58

Cupboard doors

Clause “13.57” change to “13.58”.

13.59

Openings in flush doors

Clause “13.58” change to “13.59”.

13.60

Glazing beads

Clause “13.59” change to “13.60”.

13.61

Fire resisting timber door Clause “13.60” change to “13.61”, and delete original “13.61-Not used”.

13.63

Acoustic doors

Change “Acoustic doors shall be sold core doors” to “Acoustic doors shall be either solid core doors or composite core doors”. Add “recessed” before “threshold”. Add “Airborne sound insulation shall be tested to BS EN ISO 10140-1/2 & 5:2010 or ASTM-E413-10 and ASTM E90-09. Field ratings shall be tested to ASTM E336-10 and ASTM E413-10. The Contractor shall guarantee both laboratory and field performance.” at the end of the sentence.

13.64

Doors and window frames

Add “Lippings, particularly lippings at the closing & meeting stiles shall be profiled to ensure correct operation gaps to the satisfaction of BS4787 Pt.1.” as the 2nd para.

Section 14 - Ironmongery 14.04

Standard

Add “International” after “British/European” in 1st para. Add the following clauses: BS EN 485-1+A1 Aluminium and aluminium alloys - Sheet, strip and plate - Part 1: Technical conditions for inspection and delivery BS EN 485-2 Aluminium and aluminium alloys - Sheet, strip and plate Part 2: Mechanical properties BS EN 485-3 Aluminium and Aluminium alloys, sheet, strip and plate. Part 3: Tolerances on dimensions and form for hot rolled products. BS EN 485-4 Aluminium and aluminium alloys. Sheet, strip and plate. Part 4: Tolerances on shape and dimensions for cold-rolled products BS EN 515 Aluminium and aluminium alloys - Wrought products Temper designations BS EN 573-1 Aluminium and aluminium alloys. Chemical composition and form of wrought products. Part 1: Numerical designation system. BS EN 573-2 Aluminium and aluminium alloys. Chemical composition and form of wrought products. Part 2: Chemical symbol based designation system. BS EN 573-3 Aluminium and aluminium alloys. Chemical composition and form of wrought products. Part 3: Chemical composition and form of products. BS EN 912 Timber fasteners. Specifications for connectors for timbers BS EN 1172 Copper and copper alloys. Sheet and strip for building purposes BS EN 1403 Corrosion protection of metals. Electrodeposited coatings. Method of specifying general requirements BS EN 1461 Hot dip galvanized coatings on fabricated iron and steel articles, specifications and test methods. BS EN 1652 Copper and copper alloys. Plate, sheet, strip and circles for general purposes BS EN 1654 Copper and copper alloys. Strip for springs and connectors BS EN 1906 Building hardware. Lever handles and knob furniture.

- 16 -

Requirements and test methods BS EN 2284 Specification for sulfuric acid anodizing of aluminium and wrought aluminium alloys BS EN 10029 Hot-rolled narrow steel strip. Tolerances on dimensions and shape. BS EN 10048 Hot rolled narrow steel strip. Tolerances on dimensions and shape. BS EN 10051 Continuously hot-rolled strip and plate/sheet cut from wide strip of non-alloy and alloy steels. Tolerances on dimensions and shape. BS EN 10095 Heat resisting steels and nickel alloys. BS EN 12163 Copper and copper alloys - Rod for general purposes BS EN 12164 Copper and copper alloys - Rod for free machining purposes BS EN 12166 Copper and copper alloys - Wire for general purposes BS EN 12167 Copper & copper alloys - Profile and bars for general use. BS EN 12168 Copper and copper alloys - Hollow rod for free machining purposes BS EN 12476 Phosphate conversion coatings of metals. Method of specifying requirements BS EN 15338 + AI Hardware for furniture strength and durability of extension elements and their components BS EN 15570 Hardware for furniture strength and durability of hinges and their components BS EN 15706 Hardware for furniture strength and durability of slide fittings for sliding doors and roll fronts. BS EN 15828 Hardware for furniture: strength and durability of hinges prorating on a horizontal axis BS EN 16014 Hardware for furniture: strength and durability of locking mechanism BS EN 61558-1+A1 Safety of power transformers, power supplies, reactors and similar products. Part 1 - General requirements and tests BS EN ISO 1456 Metallic and other inorganic coatings Electrodeposited coatings of nickel, nickel plus chromium, copper plus nickel and of copper plus nickel plus chromium BS EN ISO 1461 Hot dip galvanized coatings on fabricated iron and steel articles. Specifications and test methods BS EN ISO 2081 Hot dip galvanized coatings on fabricated iron and steel articles specifications and test methods BS EN ISO 2082 Metallic coatings. Electroplated coatings of cadmium with supplementary treatments on iron or steel BS EN ISO 2931 Anodizing of aluminium and its alloys. Assessment of quality of sealed anodic oxidation coatings by measurement of admittance BS EN ISO 3864-1 & 4 Graphical symbols. Safety colours and safety signs. BS EN ISO 7010 Graphical symbols. Safety colours and safety signs. Registered safety signs BS EN ISO 9445-1 Continuously cold-rolled stainless steel - Tolerances on dimensions and form - Part 1: Narrow strip and cut lengths BS EN ISO 9445-2 Continuously cold-rolled stainless steel - Tolerances on dimensions and form - Part 2: Wide strip and plate/sheet PD/CEN/TR 15349:2006 Hardware for furniture strength and durability of hinges and their components. Terms for extension elements and their components. PD/CEN/TR 15588:2007 Hardware for furniture strength and durability of hinges and their components. Terms for hinges and their components. PD/CEN/TR 15709:2008 Hardware for furniture strength and durability of hinges and their components. Terms for slide fittings for sliding doors and roll fronts.

- 17 -

PD CEN/TR 16015:2010 Hardware for furniture: Terms for locking mechanism BS 6100-1 Building and civil engineering - Vocabulary - Part 1: General terms BS 6100-6 Building and civil engineering - Vocabulary - Part 6: Construction parts Other National Standards: AAMA 611-98: American Architectural Manufacturer Association Voluntary Specification for Anodized Architectural AluminumANSI/BHMA A156.18-2006 American National Standard for Materials and Finishes AS 1476-1974 Australian Standard Specification for metric wood screws “BS EN 1634 Fire testing” rewrite to “BS EN 1634-1 to 3 Fire resistance and smoke control tests for door and shutter assemblies, openable windows and elements of building hardware”. “BS EN 12209 Locks and latches” rewrite to “BS EN 12209 Building hardware. Locks and latches. Mechanically operated locks, latches and locking plates. Requirements and test methods”. Delete the following clauses: BS 729 BS 1210 BS 1470-7 BS 1706 BS 2870/4/5 BS 2911 BS 3827 BS 4112 BS 4951 BS 5378 BS 5872

Hot dip galvanized coatings Wood screws Wrought aluminium Electroplated coatings of cadmium and zinc Copper and copper alloys Letter plates Glossary of terms Hardware for domestic furniture Builder’s hardware – lock and latch furniture (doors) Safety signs and colours Locks and latches for doors in buildings

“BS 1449” change to “BS 1449-1.1/1.8/1.14”. “BS 5499” change to “BS 5499-2, 4, 6 & 10 Safety signs, including fire safety signs”. 14.06

Certification for fire door Add “fire resistance” before “rating” in 3rd line.

14.14

Materials

“BS 1470-7 HE9-TF alloy” change to “Refer to in Clause 17.07”. “Stainless Steel” paragraph rewrite to “Grade 316 (18/10/3 molybdenum bearing grade) referred to in Clause 17.09. Lower grades will not be accepted for accessories such as lock strike plates, rebate components, etc.” “Brass” paragraph rewrite to “Brass: Plate, sheets, strips and circles: BS EN 1652 No. CW 612N R420 or H120. Profile, rod, hollow rod, wire and bars: BS EN 12163, BS EN 12164, BS EN 12166, BS EN 12167 and BS EN 12168 No. CW 614N R430 or H110.”

- 18 -

“Real Bronze” paragraph rewrite to “Real Bronze: Solid cast bronze of suitable copper-tin alloy according to BS EN 1412, BS EN 12163, BS EN 12164, BS EN 12166, BS EN 12167 and BS EN 12168, or ANSI/BHMA A156.18-2006.” 14.15

Finishes

“BS EN 12540” change to “BS EN ISO 1456” “BS EN 12373 1” change to “AAMA 611-98” “BS 12329” change to “BS EN ISO 2081 and BS EN ISO 2082”.

14.18

“BS 729” change to “BS EN ISO 1461”. “BS 1706” change to “BS EN ISO 2081 or BS EN ISO 2082”.

14.29

Add “rated” after “metal fire”.

14.32

“BS 476:Pt” change to “BS 476-22”.

14.33

Add “shall be identified according to,” after “surfaces”. Replace “Clause 5.7 Class 3” with “Clause 4.7 Grade 3 to BS EN 1154”.

14.45

Add “rated” after “fire” in line 1 and line 2 respectively. Delete “door” after “integral fire “ in line 3. “BS 476:Pt.” change to “BS 476- 22”.

14.51

“BS 3535” change to “BS EN 61558-1+A1”.

14.53

Add “resistance” after “compromise the fire” in line 2.

14.55

Add “resistance” after “), of types which do not obstruct ironmongery or affect fire”.

14.59

The last sentence rewrite to “They shall be certified by an approved security body and shall have been tested in conjunction with an appropriate fire rated door and passed the integral fire test in accordance with BS 476- 22 or BS EN 1634.”

14.82

Add “-2, 4, 6 & 10 and/or BS EN ISO 3684-1 & 4.” After “BS 5499.

14.98

Indicating sign plates

14.99 14.114

“BS 5499:Pt” change to “BS 5499-2”. “BS 5499:Pt.1” change to “BS ISO 3864-1”.

Timber connectors

“BS 1579 Table 3” change to “BS EN 912”.

Section 15 - Structural Steel Work 15.01

Generally

Delete “2005”.

15.32

Permitted deviations

Delete “2005”.

15.58

Acceptance of welds

Delete “2005”.

- 19 -

15.59

Permitted deviations

Delete “2005”.

15.61

Preparation and painting Insert “Unless approved otherwise by the SO, blast-cleaning to steelwork of new surfaces shall not be carried out until all welds for steelwork have been completed.” as second sentence in (iii). Add “and the zinc rich primer shall be applied directly on the blast cleaned metal surface” after “Contract” at the end of (iii).

15.64

Painting, stripe coats to joints and sharp edges and damaged painting

Replaced Sub-heading of clause “Painting to joints” with “Painting, stripe coats to joints and sharp edges and damaged painting”.

Add “Unless as required in 15.61(iii), there shall be no paint at the time of welding,” at the beginning of the clause. Add 2nd and 3rd paragraphs: All damaged painting shall be brought up to the same standard of preparation and painting as the adjoining surfaces. Immediately after the primer of the painting system has dried, apply a stripe coat of primer by brush to edges, corners, crevices, exposed parts of bolts, nuts and welds to ensure that all these areas have a similar dry film thickness to that of any adjacent surface. Subsequent undercoat and finishing coat of paint shall be applied similarly, but with the stripe coat for the undercoat and finishing coat be applied beforehand. 15.65

Paint

Delete “of not more than 5 litres capacity”.

Table 15.7 Type A

Surface Protection to Structural Steel

Primer

: add “applied in 1 coat” after zinc phosphate primer. Change “35” to “40” Delete item “Undercoat” Finishing coat : add “applied in 2 coats” after drying oil based finishing coat Change “30” to “80”. Change “100” to “120”. Primer : replace “Drying oil based zinc phosphate primer with “2-pack surface tolerant epoxy based aluminium paint” Change “70” to “80”. Delete item “Undercoat” Finishing coat : Replace “Drying oil based finishing coat” with “2-pack recoatable polyurethane finishing paint, applied in 2 coats” Change “40” to “80” Change “150” to “160”

15.66

Generally

“Code of Practice for Fire Safety in Buildings” instead of “Code of Practice for Fire Resisting Construction 1996” in 1st and 5th line respectively.

15.67

Fire protection system

“APP-118” instead of “PNAP 251”.

15.69

Sprayed mineral coating Add new para to (b): Should sprayed mineral coating not be applied within 4 hours to the cleaned surface, the cleaned steel surfaces shall receive one coat of drying oil based zinc phosphate primer with a dry film thickness of 35µm unless approved otherwise by the SO in writing, to the primed surface

Type B

- 20 -

prior to the application of the sprayed mineral coating and the bond coat must be compatible with sprayed mineral coating. Add “A bond coat shall be applied “after “35µm” in (b). Add new clause “(f) c. Prior to application of spray material, clips, hangers, support sleeves and other attachments required to penetrate the spray material shall be in place.” Add new clause “(f) d. Any void space between the slab soffit and the top of the steel beams shall be filled with the spray material.” Original clause (f) c. becomes (f) e.

Section 16 - Curtain Walls 16.00

Generally

“various” change to “the relevant”.

16.01

Scope of the Works

“Testing must conform to PNAP 106 as a minimum.” Rewrite to “Testing must conform to Buildings Department Practice Note APP-37 as a minimum.” “recognised” change to “recognized”. “AMMA” change to “AAMA”.

16.02

Works included

“Site” change to “Laboratory” in clause (xix).

16.03

Related work

The 1st word “work” change to “works”. The last word “includes” change to “include”.

16.04

Abbreviations

Add “APP Buildings Department Practice Note APP- for Authorized Persons, Registered Structural Engineers and Registered Geotechnical Engineers, issued by the Building Department”. “BS EN British Standards (European Collaboration)” rewrite to “BS EN European technical standards as adopted in the UK”.

16.05

Codes and standards

“Buildings Department: Practice Note 59 for Authorized Persons and Registered Structural Engineers, Current Edition” change to “APP-16, Current Edition.” in (v). “Buildings Department: Practice Notes 106 for Authorized Persons and Registered Structural Engineers, Current Edition” change to “APP-37, Current Edition.” in (vi). “AAMA 501 - Methods of Test for Metal Curtain Wall” change to “AAMA 501-05 Methods of Test for Exterior Walls” in (viii). “AAMA 501.1 Dynamic Water Infiltration Test.” rewrite to “AAMA 501.1-05 Standard Test Method for Water Penetration of Windows, Curtain Walls and Doors Using Dynamic Pressure” in (viii)(a). “AAMA 501.2 Method for Field Checking Water Leakage” rewrite to “AAMA 501.2-09 Quality Assurance and Diagnostic Water Leakage Field Check of Installed Storefronts, Curtain Walls, and Sloped Glazing Systems.” In (viii)(b).

- 21 -

“BS 6206 Specification for impact performance requirements for flat safety glass and safety plastics for use in buildings. Pendulum test. Impact test method and classification for flat glass” rewrite to “BS EN 12600 Glass in building. Pendulum test. Impact test method and classification for flat glass” in (ix). Delete “Code of Practice for” and add “1995” at the end in (xii). “Code of Practice for Fire Resisting Construction 1996” change to “Code of Practice for Fire Safety in Buildings” in (xiii). “Buildings Department: Practice Note 172 for Authorized Persons and Registered Structural Engineers” change to “APP-67” in (xv). 16.06

Contractor's design responsibility

The word “GS” change to “Specification” in line 2. In (vii), “completed” change to “complete”. Delete “and maintainable” in (vii). Add “for maintenance” at the end of the sentence of (vii).

16.07

Tender submission

“…that the glass proposed meets…” change to “…that the proposed glass meets…” in clause (iii). “supporting typical” change to “typical supporting” in (vi). “performance mock-up testing and the testing of other materials” rewrite to “performing mock-up testing and the testing of other materials” in (x). Add “proof load testing of spider fixing” after “performing mock-up testing,”, before “ and the testing of other materials.” in (x). Rewrite clause (xi): The Contractor shall submit their quality control plan which shall include but not limited to the name, experience and qualification of the TCP and any other person who shall be appointed by the Contractor to provide full-time supervision of the construction of curtain wall, window wall, glass shop front, large windows etc, including the installation of any cast-in anchorage, e.g. anchor plates, cast-in embeds, through bolts and the like all as the requirement set out in APP-37. “GS” change to “Specification” in line 5 of clause (xii).

16.08 16.09

Programme for the Works Provision of drawings and calculations

moving “as specified” after “… programme for the Work”. Moving “as specified” after “…submittals for approval” in line 1. “identifying” change to “identified with” in line 3 of 2nd para. Add “a” between “be” and “cause” in line 4 of 2nd para. “Review” change to “Reviewing” in line 1 of para 3. “BS 499-1, 2009” change to “BS 499-2C, BS EN 22553” in item (m). Move “as specified” in line 1 to line 2, after “…qualified structural engineer” in (ii).

- 22 -

In (iii), “mock up tests” change to “tests mock up” in line 2. In (v), “Stone samples ….” rewrite to “Stone samples should include the name of the quarry and country, and consist of full range of color, texture and the grading of the stone.” In (vi), “works” change to big letter “Works”. Add “in” after “Refer to” in clause (vii) and (viii). 16.10

Generally

Delete “the varying” in line 2 of (i). Add “fluctuations” after “relative humidity” in line 2 of (i). Add a “comma” after “… free from defects and blemishes” in (i).

16.11

Steel

“BS 1449:Pt. 2” in line 1 of (i) change to “BS EN 10048, BS EN 10095, BS EN ISO 9445-1, BS EN ISO 9445-2”. “BS 1449:Pt. 2” in line 6 of (i) change to “BS EN ISO 9445-1, BS EN ISO 9445-2”. “304 S15” rewrite to “Grade 1.4301(304 S15)” in (i). Delete “shall be” after “Clause 15.02 and 15.03” and “be” after “Clause 15.63” in (ii).

16.14

Stone

Add “test in accordance with ASTM C880/C880M-09” after “These tests must include for flexural strength” in (i). Add “ASTM C1354/C1354M-09” before “Determination method…” in (i). “test” instead of “testing” in line 4 of clause (i).

16.15

Anchors in stone

“load” instead of “loading” in line 5 of clause (iii). Add a “comma” after “However” in line 5 of clause (iii). Delete “which are” in (c) of (iv). “allow” instead of “provide” in (v).

16.17

Anchors in concrete and Add after “Anchors”: “, including cast-in-situ anchor channels or other masonry embedded fixings” in (i). Replace “Expansion” with “Anchor” in (iii) and (iv). “all bolts” change to “all fixings including bolts” in the first line in (iv). Add a new clause (viii), “Anchor bolts, anchor channels or other proprietary fixings shall be installed in accordance with manufacturers’ specifications including bolt distance, edge distance and embedment depth.”

16.18

Fastener

“Bolts, screws, nuts and washers shall, as a minimum, be to Clause 15.06, 15.07 and 15.39, shall be galvanized to Clause 15.63 and be tested in accordance with Clause 15.20.” rewrite to “Bolts, screws, nuts

- 23 -

and washers shall be to Clause 15.06, 15.07 and 15.39, as a minimum, galvanized to Clause 15.63 and tested to Clause 15.20.” in (iv). Add a new clause (ix), “The mechanical properties, dimensions, load capacities and specific proprietary model number/series of metal spider fixing and the fixing components shall be shown in relevant drawings and submitted for approval. The Contractor shall carry out proof load testing of spider fixing.” 16.19

Shims

“shall be” instead of “shall have” in line 2 of (i). “thick” instead of “thickness” in line 3 of (i). “shall sufficiently reduce friction to…” in line 3 change to “sufficiently capable of reducing friction to…” in (i). “shall be positively” change to “and positively” in line 5 of (i).

16.20

Weep hole filters

“(to or by)” change to “by”.

16.22

Thermal insulation and fire-safing insulation Sealants

“Buildings Department PNAP 172” change to “APP-67”.

16.21(i)

In “Testing Method” column: Change “ASTM-D2240” to “ASTM-C661-06(2011)”. Change “TT-S-00230C-02 TT-S-001543A” to “ASTM C719-93(2010). Change “ASTM-D-750” to “ASTM-C793-05(2010). Change “TT-S-001543A” to “ASTM C510-05a(2011). In “Performance Requirement” column: Change “15-25” to “15-30”. Change “0.67 MPa min.” to “0.69 MPa min.”. Change “Excellent” to “250hrs min. UV exposure time without cracks”.

16.21(iii)

In “Testing Method” column: Change “ASTM-D2240” to “ASTM-C661-06(2011)”. Change “TT-S-00230C-02 TT-S-001543A” to “ASTM C719-93(2010). Change “ASTM-D-750” to “ASTM-C793-05(2010). Change “TT-S-001543A” to “ASTM C510-05a(2011). In “Performance Requirement” column: Change “15-25” to “15-30”. Change “0.67 MPa min.” to “0.69 MPa min.”. Change “110 psi” to “100 psi”. Change “Pass” to “250hrs min. UV exposure time without cracks”.

16.21(v)

In “Testing Method” column: Change “ASTM-D2240” to “ASTM-C661-06(2011)”. Change “TT-S-00230C-02 TT-S-001543A” to “ASTM C719-93(2010). Change “ASTM-D-750” to “ASTM-C1184-05. Change “TT-S-001543A” to “ASTM C510-05a(2011). In “Performance Requirement” column: Change “25-35” to “25-50 as in ASTM1184-05”. Change “0.8 MPa min.” to “0.83 MPa min.”. Change “± 25%” to “± 50% for one component sealant ± 25% for multiple component sealant”. Change “Excellent” to “pass 5000hrs weathering test”.

16.25

Louvres

“AMCA 500” change to “ANSI/AMCA Standard 500-L-07” in clause (ii).

- 24 -

16.27

Concealed and exposed flashing

16.28

Maintenance replacement Add “that” after “…which are placed in appropriate locations to ensure” standby materials in (ii).

16.29

Generally

Add “metallic” after “…or other type of separation coating against dissimilar” in (i).

“specified in” instead of “required by” in para 2 of line 1. Delete “but unless specified otherwise therein, as a minimum shall” in line 2 of 2nd para. “comply” change to “complying” in 2nd para. Add “shall be the minimum:” at the end of 2nd para. “BS ISO 10074” instead of “BS 5599” in (i).

16.31

Anodic coating to “Complete certified…” change to “Complete sets of finish process aluminium and testing of records and certified” same Delete “and complete finish process records” in line 2 of para 6. In second last para, “Surfaces to be finished” change to “Surfaces prior to finish”. “Anodized aluminium is to…” change to “Anodized aluminium shall…”.

16.32

Organic coating finish to “These are to be submitted for…” change to “These shall be submitted aluminium for…” in (ii).

16.34

General

“BS 8118: part 1 & 2 – Structural Use of Aluminium” rewrite to “BS EN 1999-1, part 1, 3 & 4” in (i). Add “and BS 6262-1 to 4, 6 & 7: Glazing for Buildings.” at the end of the clause in (iii). In (v), rewrite the sentence to “The subclass P sealants refer to BS EN ISO 8339, BS EN ISO 9046 and BS EN ISO 10591; The subclass E sealants conform to BS EN ISO 8340, BS EN ISO 9047, BS EN ISO 10590 and BS EN ISO 11431; the subclass F&G sealants to BS EN ISO 11600:2003+A1:2011”.

16.39

Welding

“Welding of Aluminium shall be tested to BS 3451” rewrite to “Welding of Aluminium shall be tested to BS EN ISO 4136 - Destructive tests on welds in metallic materials. Transverse tensile test, BS EN ISO 5173 Destructive tests on welds in metallic materials. Bend tests, BS EN 1320 - Destructive tests on welds in metallic materials. Fracture tests, BS EN 1321 - Destructive test on welds in metallic materials. Macroscopic and microscopic examination of welds” in 3rd para.

16.40

Application of sealant and gasket

Rewrite the sentences to “The subclass P sealants refer to BS EN ISO 8339, BS EN ISO 9046 and BS EN ISO 10591; The subclass E sealants conform to BS EN ISO 8340, BS EN ISO 9047, BS EN ISO 10590 and BS EN ISO 11431; the subclass F&G sealants to BS EN ISO 11600:2003+A1:2011”.

- 25 -

16.46

Structural requirements

Sub-heading of the clause changed from “Design pressures and loads” to “Structural requirements”. In (iv), add after “separately” on the first line “the use of curtain wall glazing as protective barrier shall comply with all the structural requirements as specified in APP-110.”

16.47

16.49

Criteria for framing members and anchors at glass and stone Criteria for cyclic test

In (i), “APP-37” instead of “PNAP 106”.

In the left side topic column, “Criteria for HK Government” change to “Criteria for cyclic test”. Rewrite the sentence to “Performance criteria for cyclic test shall be as specified in APP-37”.

16.59

Glass replacement

“shall permit replacement glass of the same…” change to “shall permit replacement of glass with the same…”.

16.66

Criteria for operable window Laboratory tests on full scale mock-ups

“BS 6375-2” instead of “BS 6375:Pt. 2” in (iii).

16.73

“APP-37” instead of “PNAP 106” and “structural cyclic test” change to “structural mock-up cyclic test.” in (j). “BS 6375:Pt. 2” change to “BS 6375-2” in (n). “ASTM E283” change to “ASTM E283 – 04” and add “and mock-ups” after “ASTM E283 – 04” in (ii). “ASTM E331-00(2009)” instead of “ASTM E331” in (iv). “AAMA 501.1-05” instead of “AAMA 501.1” in line 1 of (v). “ASTM E330-02(2010)” instead of “ASTM E330” in line 1 of (vi).

16.74 16.76 16.77

Field tests on actual “AAMA 501.2” instead of “AAMA 501.2-09” in (i). buildings Manufacturer's tests of “ASTMC794-10” instead of “ASTMC794” in (ii). sealants Laboratory tests of stone “ASTM C880/C880M-09” instead of “ASTM C880” in (iii)(a), (iv), (v), (vii), (viii), (xi)(a), (xi)(b) and (xii) respectively. “ASTM C97/C97M-09” instead of “ASTM C97” in (iii)(d). In (v)(a), rewrite to “Depth shall be equal to proposed thickness.” In (v)(b), rewrite to “Width equals 100 mm when thickness is less than 70mm, or shall be equal to 1.5 times the thickness when thickness is greater than 70 mm.” In (v)(c), rewrite to “The span as tested shall be equal to 10 times thickness.’ In (v)(d), rewrite to “Overall length shall be not less than 50 mm and not more than 100 mm greater than the span as tested.” “ASTM C1354 / C1354M-09” instead of “ASTM C1354” in (ix) and (xi)(e) respectively.

- 26 -

16.78

Test reports

“Submit a certified laboratory test report…BS EN 12211:2000” rewrite to “Submit a certified laboratory test report in accordance with BS 5368:Pt.4.”

Section 17 - Metal Works 17.07

Aluminium alloy

In 1st para: “BS EN 485” change to “BS EN 485-1+A1, BS EN 485-2, BS EN 485-3， ，BS EN 485-4”. In 1st para: “BS EN 573” change to “BS EN 573-1, BS EN 573-2, BS EN 573-3, BS EN 573-5”. In 2nd para: “BS 1474” change to “BS EN 515, BS EN 573-1, BS EN 573-2, BS EN 573-3, BS EN 573-5, BS EN 755, BS EN 12020”.

17.09

Stainless steel

In 1st para, rewrite to: “Stainless steel plate, sheet and strip shall be of grade 316 or 304 to BS EN 10088-2 for flat product, BS EN 10088-3 for long product; BS EN 10095; BS EN 10048; BS EN ISO 9445-1; BS EN ISO 9445-2, of Finish No.DP1 for dull polish or “satin” finish, 2R for reflective finish, No. 2B for mill finish, No. 1G or 2G for polish finish with fine grit and No. 1P or 2P for bright reflective mirror polished finish with a high degree of image clarity, or otherwise as required. Where the surface finish is specified as micron (RA), a certificate shall be submitted for SO’s verification.” In 2nd para, delete the following and the table: “The chemical composition of the steel as determined by cast analysis, shall comply with the following table:” In 3rd para, delete “BS 6323:Part 1” and change “BS 3111:Pt 2” to “BS EN 10263-1 BS EN 10263-5.” “BS 6105” change to “BS EN ISO 3506” in last para.

17.12

Adhesive for metal

Rewrite the sentence as following: “The application of adhesive for bonding metal to metal shall be according to the manufacture’s recommendations, and the specimen tests shall be conducted to ASTM standards. Tensile test can refer to ASTM D897 – 08. Peel strength to ASTM D903-98. Impact strength of adhesive bonds to ASTM D950-03.”

17.17 17.18

Welding of aluminium “BS EN 1011-4” instead of “BS 3019:Part 1, BS 3571:Part 1” alloy Welding of stainless steel “BS EN 1011-3” instead of “BS 7475

17.19

Brazing

Rewrite the sentence to “Guidance on the application of brazed joints to BS EN 14324. Non-destructive examination shall refer to BS EN 12799. Destructive tests of joints to BS EN 12797. For brazer approval, to BS EN 13133, and the Procedure approval to BS EN 13134.”

17.20

Design of articles to be coated

Add “Parts 1-5, 7-9. Hot dip galvanizing and sherardizing to BS EN ISO 14713.” after BS 4479.

17.21

Finishing to steel

“BS EN ISO 2081” instead of “BS1706” in (b).

- 27 -

“BS EN ISO 2063” instead of “BS EN 22063:Part 1” in (c). “BS EN ISO 1461” instead of “BS 729” in (d). Delete “Type 2” at the end of the clause. 17.23

Chromium plating

“BS EN ISO 1456” instead of “BS 1224”

17.32

Steel windows and doors “transoms” instead of “transomes” in (f) and (g) respectively. Add “either electrical or manual” before “remote control gear” in (n).

17.33

Aluminium windows and “.BS 485……BS 573 5:2007” rewrite to “BS EN 485-1+A1, BS EN doors 485-2, BS EN 485-3， ，BS EN 485-4, BS EN 515, BS EN 573-1, BS EN 573-2, BS EN 573-3, BS EN 573-5 and BS EN 755, BS EN 12020” in (b). Delete clause (g), so the original clauses (h) to (s) will change to (g) to (r). In clause K(ii)(a), “diecast” change to big letter “D”.

17.36

Fixing metal windows and doors

Delete “after” in line 4 of clause (c) “BS EN ISO 11600:2003+A1” instead of “BS 5215” in (d) and (j) respectively.

17.41

Roller shutters and doors Add “, or folded 3mm thick aluminium panel” before “fully supported and braced to…” in (i).

17.42

Fire resisting shutters

“Code of Practice for Fire Safety in Buildings, Buildings Department” instead of “Code of Practice for Fire Resisting Construction, Building Authority” in 1st para.

Sections 18 - Finishes 18.04

Lime

“Clause 9.18” change to “Clause 9.15”.

18.05

Lime putty

“Clause 9.19” change to “Clause 9.16”.

18.15

Spatterdash

Add “foreign” between “such” and “substances” in line 1.

18.16

Preparation of hardened or existing concrete Movement joints

Add “the” between “to” and “hardened” in line 1.

18.22

“equally spaced” instead of “constructed” and delete “equally spaced” after “4m centres in each direction”. Add “spacing of” before “4m”. Add “or as shown on the drawings.” at the end of sentence.

18.24

Steel lathing

“weighed” instead of “weighing”.

18.28

Tying wire

“galvanized” instead of “galvanised”.

18.36

Stone chippings

Add “or other foreign substances.” at last.

- 28 -

18.46 & 18.47

“applying” instead of “application of” in 18.46 and 18.47(v).

18.57 to 18.70

Clause 18.56.1 to 18.56.14 change to 18.57 to 18.70.

18.71 to 18.115

Clause 18.57 to 18.101 change to 18.71 to 18.115.

18.61 (original clause 18.56.4)

Standards and ISO Certification

“BS 5262 and BS 1191” change to “BS 8481, BS EN 13279-1, BS EN 13279-2, BS EN 13914-1, BS EN 13914-2 and PD/CEN/TR 15123:2005”.

18.63 (original clause 18.56.7)

Handling & storage

Add “separated by types and” after “Bagged premix mortar shall be”.

Delete “separated by types” after “…shall be separated by types and stored”. 18.74 (original clause 18.60)

Screeds generally

“BS 8204:Pt. 4” change to “BS 8204–4:2004+A1:2011”.

“BS 8000:Pt.11.1” change to “BS 8000:11.1” in line 2 and line 3 respectively. 18.79 (original clause 18.65) 18.89 (original clause 18.75) 18.91 (original clause 18.77) 18.94 (original clause 18.80) 18.96 (original clause 18.82)

Bay sizes for floor and roof screeds

Add “interval” after “Allow 24 hours (minimum)”.

Generally

“CP 204:Pt. 2” change to “BS 8204-1. BS 8204-2+A2, BS 8204-4+A1 and BS 8204-5+A1.”

Laying flooring

“Clauses 18.78 and 18.79” instead of “Clauses 18.64 and 18.65.”

Surface finishes on flooring

“Clause 18.81” instead of “Clause 18.67”.

Coloured finish

Delete the first work “Where”, second word “coloured” change to big letter of “C”. Delete “the coats shall be”. “Clauses 18.92 or 18.93” instead of “Clauses 18.78 or 18.79” in (ii). Add “Materials” after “RIGID TILE OR SLAB FINISHES”.

18.103 and 18.108 (Original clauses 18.89 & 18.94) 18.116 Stone wall cladding

“BS EN 14411” instead of “BS 6431” in para 1, para 3 in 18.103 and 18.108 respectively.

18.117 to 18.179

Clause 18.102 to 18.163 change to 18.117 to 18.179.

18.117 Floor and wall tiling (Original clause generally 18.102)

Add (iii) Buttering to Clause 3.2.1.8 in BS 8000-11.1.

Add a new clause 18.116 as follow: “Material for stone wall cladding as in Clause 16.14 and sealant as in Clause 16.21”.

- 29 -

18.122 and 18.124 (Original clauses 18.107&18.109) 18.125 (Original clause 18.110) 18.138 (Original clause 18.123) 18.144 (Original clause 18.129) 18.145 (Original clause 18.130) 18.148 (Original clause 18.133)

Add “from” between “it” and “absorbing” in 18.122(i)(b) and 18.124(ii)(a) respectively.

Fixing stone paving slabs Add “laid to fall” before “as directed by the SO”.

Damaged tiles

Delete “which” in line 1.

Samples

“Clauses 18.149 and 18.150” instead of “Clauses 18.134 and 18.135”.

Pile yarn

Add “, or other equivalent approved by the SO.” at the end of (v).

Dyeing

Delete “employed strictly manufacturer's instructions”.

in

accordance

with

the

dyestuffs

Add “and it shall be applied strictly in accordance with the dyestuffs manufacturer's instructions.” at the end of sentence. 18.149 (TABLE 18.7)

Colour fastness

18.150 Physical properties (Original clause 18.135)

18.154 (Original clause 18.138) 18.155 (Original clause 18.139) 18.162 (Original clause 18.146) 18.167 (Original clause 18.151)

In “Method of Test” column, “BS 1006” change to “BS EN ISO 105-B01, E01, B02, D02, G02, B03, B04, E05, C06, E06, X08, X13”, “BS 2677” change to “BS EN ISO 105-X12”, “BS 3661/20” change to “BS EN ISO 105-X05”. In table 18.8, “BS 4052” change to “BS ISO 2094”, Delete “Thickness loss” column, “BS 4682:Pt. 1” change to “to be decided by the SO”, “BS 4682:Pt. 3” change to “BS 4682-4”, “BS 4797” change to “to be decided by the SO”.

Environmentally friendly Add “Environmentally friendly carpets shall satisfy the following carpets criteria:” as the first sentence. Underlay

Add “and BS EN 14499” after “BS 5808”.

Installations of carpet

In (iii), “Clause 18.162” instead of “Clause 18.146”.

Structural requirements

Add “Horizontal load- 1.2KN/m2” at the end of the sentence in (i).

“90mm” rewrite to “90 N/m”, “50kg” rewrite to “50 KN” in (iv). Add “Alternatively, the raised floor system can be tested for concentrated load, ultimate load, rolling loads, stringer load, pedestal axial load, pedestal overturning moment, uniform load and drop impact load according to Ceilings and Interior Systems Construction Association (CISCA) Recommended Testing Procedure, subject to approval by the SO” in (v). Change “225mm” to “2.5mm” in (i).

- 30 -

Change “1.00mm” to “1mm” in (iv). 18.168 (Original clause 18.152) 18.169 (Original clause 18.153)

Hydrothermal requirements

“Clauses 18.166 and 18.1167” instead of “Clauses 18.150 and 18.151” at last paragraph.

Fire and safety requirements

Delete “and” after “BS 6266 Section 4.4”, and “BS 5588:Pt. 3 Section 11.3.1 and 11.3.2” change to “BS 9999 and APP-83” in (ii). In (vi), “that” instead of “which” in line 1, “of” instead of “using” in line 1, and “does” instead of “do” in line 4.

18.177 Protective finishes (Original clause 18.161)

Add “of the system” after “All parts” in line 1 of para 2.

“Clause 18.168” instead of “Clause 18.152”. 18.179 Co-ordination with (Original clause building services 18.163) installation

Clause “18.163” change to “18.179”, and add the following: “The Contractor shall co-ordinate with Specialist subcontractors for building services installation of floor boxes, trunkings and cables to be installed below the raised floor systems. Locations of the openings on the raised floor panels for the installation of the floor boxes shall be submitted for the SO's approval.”

18.181

Add new clause 18.181: “Subject to the SO’s instruction, air and leakage test shall be performed according to CISCA Recommended Testing Procedure.”

Air and leakage test

18.182 to 18.184

Clause 18.164 to 18.166 change to 18.182 to 18.184.

18.184 Non-slip homogenous (Original clause floor ties 18.166)

Changes in Table a. Dimensions and surface quality. Delete “BS 6431” in row-1, column-2. Change “BS 6431” to be “BS EN 14411” in row-3,column-1 Change the three “BI” to be “BIb” in row-3 Add “free from visible defects that would impair the appearance of a major area of tiles” in item (6); Change “Part 18:1983” to be “BS EN ISO 10545-13” in row-3,column3 Changes in Table b. Physical properties Delete “BS 6431” in row-1, column-2. Change “BS 6431” to “BS EN 14411” in row-3,column-1 Change the three “BI” to “BIb” in row-3 Add “Individual” in row-6, column-2 Change “Part 11:1983” to “BS EN ISO 10545-3”column-3 Change “Part 12:1983” to “BS EN ISO 10545-4”column-3 Change “Part 13:1986” to be “to be decided by the SO”column-3 Change “Part 14:1983” to be “BS EN ISO 10545-6”column-3 Change “Part 15:1983” to “BS EN ISO 10545-8”column-3 Change “>=27” to “>=30”in row-6, column-4,5&6. Add three “>=27” in row-6, column-4,5,6 with respect to “Individual” Change three “