CONQUAS 8th edition manual

CONQUAS ®®®® Effective date: 1st Dec 2014 i CONQUAS ®®®® THE BCA CONSTRUCTION QUALITY ASSESSMENT SYSTEM...

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CONQUAS

®

THE BCA CONSTRUCTION QUALITY ASSESSMENT SYSTEM

CONQUAS®

CONQUAS® THE BCA CONSTRUCTION QUALITY ASSESSMENT SYSTEM

Effective date: 1st Dec 2014

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CONQUAS®

First Edition 1989 Second Edition 1990 Third Edition 1992 Fourth Edition 1995 Fifth Edition 1998 Fifth Edition 2000 version Fifth Edition 2003 version Sixth Edition 2005 Seventh Edition 2008 Eighth Edition 2012 Eighth Edition 2014 version

Copyright @ 2014 by the Building and Construction Authority, Singapore. All rights reserved. No part may be reproduced, in any form or by any means, without permission in writing from the publisher. While every effort has been made to ensure the accuracy of the information presented in this publication, neither the Authority nor its employees or agents can accept responsibility for any loss or damage incurred in connection with the use of the contents.

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CONQUAS®

CONTENTS 1.0

INTRODUCTION................................................................................ 1 1.1 1.2 1.3

2.0

CONQUAS......................................................................................... 3 2.1 2.2 2.3 2.4

3.0

Objectives of CONQUAS Scope of CONQUAS Derivation of CONQUAS

Components to be assessed The Weightages CONQUAS Assessor Sampling

THE ASSESSMENT........................................................................... 6 3.1 3.2 3.3 3.4 3.5 3.6 3.7

Assessment Approach Structural Works Assessment Architectural Works Assessment M&E Works Assessment Bonus Points Computation of CONQUAS Score Publication of CONQUAS Scores

APPENDICES Appendix 1 Appendix 2 Appendix 3 Appendix 4 Appendix 5

Quality Standards for Structural Works................................... 23 Quality Standards for Architectural Works............................... 32 Quality Standards for M&E Works........................................... 50 Defects Grouping Guide for Assessment of Internal Finishes 63 Building Grouping Guide……………………………………….. 64

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1.0 INTRODUCTION 1.1 Objectives of CONQUAS The Construction Quality Assessment System or CONQUAS was developed by the Building and Construction Authority (BCA) in conjunction with major public sector agencies and various leading industry professional bodies, organizations and firms to measure the quality level achieved in a completed project. CONQUAS was designed with three objectives: (a)

To have a standard quality assessment system for construction projects.

(b)

To make quality assessment objective by:

(c)

-

measuring constructed works against workmanship standards and specification.

-

using a sampling approach to suitably represent the whole project.

To enable quality assessment to be carried out systematically within reasonable cost and time.

CONQUAS is an independent assessment. Unless specified in the building contract, project engineers or architects should not use CONQUAS to decide if the building or parts of the building project are acceptable.

1.2 Scope of CONQUAS CONQUAS sets out the standards for the various aspects of construction work and awards points for works that meet the standards. These points are then summed up to give a total quality score called the CONQUAS Score for the building project. CONQUAS covers most aspects of general building works. assessment consists of three components: (1) (2) (3)

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The

Structural Works, Architectural Works and Mechanical & Electrical (M&E) Works.

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Each component is further divided into different items for assessment. However, the assessment excludes works such as piling, heavy foundation and sub-structure works which are heavily equipment-based, buried or covered and usually called under separate contracts or subcontracts. The building is assessed primarily on workmanship standards achieved through site inspection. The assessment is done throughout the construction process for Structural and M&E Works and on the completed building for Architectural Works. Apart from site inspection, the assessment also includes tests on the materials and the functional performance of selected services and installations. These tests help to safeguard the interest of building occupants in relation to safety, comfort and aesthetic defects which surface only after sometime.

1.3 Derivation of CONQUAS The minimum standards were derived from discussions with the major public sector agencies, developers, consultants and contractors based on the general specifications used in their projects. To match the expectations from the end users, feedback through complaints and defects listings were also considered in refining the weightages and assessment standards. In developing CONQUAS, studies and numerous trials were conducted to fine-tune its new test techniques and assessment standards. Moderation of the scoring system was carried out along with trials to ensure accuracy, consistency and alignment with end users expectations.

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CONQUAS®

2.0 CONQUAS 2.1 Components to be assessed The CONQUAS assessment is divided into three main components Structural Works, Architectural Works and M&E Works. (a)

Structural Works The structural integrity of the building is of paramount importance as the costs of failure and repairs are very significant. The assessment of Structural Works comprises: (i)

Site inspection of formwork, steel reinforcement and finished concrete during construction. The assessment shall include structural steel and pre-stressed concrete if each constitutes more than 20% of the total structural cost. Precast elements will also be assessed if the precast concrete volume exceeds 20% of total structural concrete volume.

(ii)

Laboratory testing of compressive strength of concrete and tensile strength of steel reinforcement.

(iii)

Non-destructive testing of the uniformity and the cover of hardened concrete.

The quality standards for Structural Works are given in Appendix 1. (b)

Architectural Works Architectural Works deal mainly with the finishes and components. This is the part where the quality and standard of workmanship are most visible. The assessment covers: (i)

Site inspection of internal finishes, roofs, external walls and external works at the completion stage of the building. Internal finishes include floors, internal walls, ceiling, doors, windows and components e.g. wardrobe, kitchen cabinet, vanity top, mirror, bathtub, water closet, shower screen, basin, signage, emergency lightings, railings, unit number plates, lift fittings, letter box, lightings, metal gate, etc.

(ii)

Material & functional tests such as window water-tightness, wet area water-tightness and adhesion of internal wall tiles.

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CONQUAS® There is also in-process assessment on installation of waterproofing for internal wet areas. The quality standards for Architectural Works are given in Appendix 2. (c)

Mechanical & Electrical (M&E) Works The quality of M&E Works is important in view of its increasingly high cost proportion and its impact on the performance of a building. The assessment covers Electrical Works, Airconditioning & Mechanical Ventilation Works (ACMV), Fire Protection Works, Sanitary & Plumbing Works and basic M&E fittings. The stages of the assessment include: (i)

Site inspection of installed works before they are embedded/concealed. Such items include ACMV ductworks, electrical conduits, concealed pipes, etc.

(ii)

Site inspection of final installed works such as the AirHandling Unit (AHU), cooling tower, fire alarm control panel, etc.

(iii)

Performance tests on selected works such as Water Pressure Test, Earthing Test, Dry Riser Test, etc.

The quality standards for M&E Works are given in Appendix 3.

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2.2 The Weightages In CONQUAS, the weightages for Structural, Architectural and M&E works are allocated according to four categories of buildings as follows:

CAT B

CAT A Commercial, Industrial, Institution & others

Commercial, Industrial, Institution & others

Structural Works Architectural Works

20%

Components

CAT C CAT D

Private Housing

Public Housing (Sold Flats)

Public Housing (Rental Flats)

Landed Housing

25%

20%

30%

40%

25%

60%

65%

70%

65%

55%

70%

M&E Works

20%

10%

10%

5%

5%

5%

CONQUAS Score

100%

100%

100%

100%

100%

100%

Note : (i) In general, projects with central cooling system having cooling tower, chiller system, etc are classified under CAT A. Otherwise, it will be classified under CAT B. Appendix 5 provides a guide with listing of buildings under the various categories. (ii) For Public Housing with a combination of Sold and Rental Flats, the project will take the Category of the flat type where the number of units is more than 50% of the total units.

The weightage system, which is aimed at making the CONQUAS score objective in representing the quality of a building, is a compromise between the cost proportions of the three components in the various buildings and their aesthetic consideration. The CONQUAS score of a building is the sum of points awarded to the three components in each category of buildings.

2.3 CONQUAS Assessor BCA assessors undergo a rigorous training programme. They are required to attend BCA's in-house CONQUAS training and calibration programme to ensure competency and consistency in the assessment.

2.4 Sampling As it is impractical to assess all elements in a building, CONQUAS uses a sampling system for the assessment. The sampling system, which is based on the gross floor area of the building, will ensure that the assessment adequately represents the entire building. Effective date: 1st Dec 2014

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3.0 THE ASSESSMENT 3.1 Assessment Approach In general, the Assessor should select the actual locations to be assessed prior to each assessment. Selection of samples shall be based on drawings and location plans. The samples shall be distributed as uniformly as possible throughout the construction stages. The scoring will be done on the works that are inspected for the first time. Rectification and correction carried out after the assessment will not be re-scored. The objective of this practice is to encourage contractors "doing things right the first time". When an assessed item does not comply with the corresponding CONQUAS standards, it is considered failed and a "X" will be noted in the assessment form. Likewise a " " is given for an item meeting the standards. A "blank" will indicate that the item is not applicable. The score is computed based on the number of " " over the total number of items assessed.

3.2 Structural Works Assessment The assessment for Structural Work will be carried out for every building block as the construction proceeds. A sample in structural work can be a beam, a column, a wall or a slab. The assessment of a reinforced concrete structure consists of the following items: Reinforced Concrete Structure

Weightage %

Formwork

15

Rebar

20

Finished Concrete

25

Concrete Quality

5

Steel Reinforcement Quality

5

NDT - UPV test for concrete uniformity

15

NDT - Electro-Covermeter test for concrete cover

15

Total

100

* If total precast concrete volume exceeds 20% of total structural concrete volume, assessment will be carried out for precast concrete construction. The points will be distributed proportionately between formwork/rebar assessment and precast concrete assessment based on the respective concrete volume percentage.

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CONQUAS® For a typical reinforced concrete structure, selection of samples for assessment is based on the following guidelines: Items

GFA per Sample

Min Sample

Max Sample

Remarks

1

Structural Elements

500 m2

30

150

For Non-Housing Project

1a

Structural Elements

1500 m2

30

50

For Housing Project

2

Concrete Compressive Strength

-

100%

-

Declaration by Qualified Person

3

Steel reinforcement Tensile Strength

-

100%

-

Declaration by Qualified Person

4

NDT- UPV test for concrete uniformity

5,000 m2

2 sets

20 sets

5 structure members per set

5

NDT - Electro-Covermeter test for concrete cover

5,000 m2

2 sets

20 sets

5 structure members per set

Note: The computed number of elements to be checked must be evenly distributed throughout the entire block and cover at least 50% of floors in a block. They should also as far as possible cover the different types of structural elements.

The resulting score for the formwork/rebar/precast and finished concrete will be the sum of the number of checks that meet the standards. There is no assessment of precast components at the precast yard. The assessment is applicable for all types of precast components at site. The assessment of the quality of concrete and steel reinforcement and the non-destructive tests is based on compliance to the standards (see Appendix 1a). The introduction of the non-destructive tests, i.e. on concrete uniformity and cover for steel reinforcement, is to minimise the risk of carbonation and steel corrosion which affect the durability of the concrete structures. If Structural Works consists of structural steelwork which constitutes more than 20% of the structural cost, assessment will be required for the latter and the points will be distributed proportionately. This applies to Pre-stressing Works as well. In any case, the distribution should follow the cost composition for these three types of structural works in a project.

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CONQUAS® The distribution of points for Structural Steelwork and Pre-stressed Concrete are as follows: Structural Steelwork

Weightage %

Main Member/Partially Assembled Component

40

Metal Decking

20

Erection Tolerances

10

Corrosion & Fire Protection

10

Welding Test Reports

20

Total

100

Note: Assessment for Structural steel roof truss is compulsory irregardless of the 20% costing criteria

Pre-stressed Concrete

Weightage %

Tendon & Anchorage

25

Sheathing

25

Stressing & Grouting

25

Debonding

25 Total

100

The selection of samples for Structural Steelwork assessment is based on the following guidelines: Steel tonnage per sample

Min Sample

Main member / Partial assembled component

250

5

Metal Decking

250

5

Erection Tolerances

500

5

Corrosion & Fire Protection

500

5

Items Structural Elements

Material & Functional Test Welding Test Reports (NDT)

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All critical welding joints

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3.3 Architectural Works Assessment Assessment of Architectural works is carried out upon completion of the building and before handing over of the project to the owner. The assessment consists of the following items: Architectural Elements

Weightage % Total

Internal Finishes

Breakdown

56

Floor

16

Internal Wall

16

Ceiling

6

Door

6

Window

6

Component

6

Roof

4

4

External Wall

11

11

External Work*

6

6

Design, Material & Functional Tests

23

Pre-packed Plaster

1

Field Window Water-Tightness Test (WTT) (BCA Test 7 pts + Self-Testing 2 pts)

9

Wet Area Water-Tightness Test (BCA Test 4 pts + Self-Testing 1 pt)

5

Internal Wet Area Waterproofing Process

2

Pull-Off-Test for Internal Wall Tiles External Facade (Precast or System Formwork or Cladding Facade) Internal Wall Partition (Drywall or Precast panel partition)

4

Total

1 1 100

Note: Assessment for internal wet area waterproofing process will be waived and points allocated automatically if the appointed contractor for such works is accredited under the SCI (Singapore Concrete Institute) Accreditation Scheme for Waterproofing Specialist Contractors.

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CONQUAS® Weightages for internal finishes and M&E fittings assessment are allocated at the defect level based on the guidelines set out below: Element

Floor

Internal Wall

Ceiling

Door

Window

Component

M&E Fitting

Element Weightage

16 points

16 points

6 points

6 points

6 points

6 points

*15 points

Defect Category

Defect Weightage

Finishing

4.8

Alignment & Evenness

2.8

Crack & Damages

4.8

Hollowness

1.6

Jointing

2.0

Finishing

2.8

Alignment & Evenness

2.8

Crack & Damages

4.8

Hollowness

2.8

Jointing

2.8

Finishing

0.9

Alignment & Evenness

0.9

Crack & Damages

1.8

Roughness

1.5

Jointing

0.9

Joint & Gap

0.6

Alignment & Evenness

0.6

Material & Damages

1.8

Functionality

1.8

Accessories Defects

1.2

Joint & Gap

0.6

Alignment & Evenness

0.6

Material & Damages

1.2

Functionality

1.8

Accessories Defects

1.8

Joint & Gap

0.6

Alignment & Evenness

0.6

Material & Damages

1.8

Functionality

1.8

Accessories Defects

1.2

Joint & Gap

*1.5

Alignment & Evenness

*3.0

Material & Damages

*4.5

Functionality

*4.5

Accessories Defects *1.5 * Illustration refers to CONQUAS Category B projects only. For projects in other categories, weightages at defect level will be distributed in similar proportions

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CONQUAS® The assessment is based on the sampling guidelines as set out below: Items

GFA per Sample

Min Sample

Max Sample

m2

30

150

Remarks For Non-Housing Project & Mixed Development Project with Non-Residential GFA exceeding 50% For all Private Housing Project & Mixed Development Project with Residential GFA exceeding 50% For Public Housing Project 50% of the blocks / units 1 for each type of external work

1

Internal Finishes

500

1a

Internal Finishes

70 m2

30

800

1b 2 3

Internal Finishes External Wall External Work

70 m2 -

30 50% 1

600 -

4

Pre-packed Plaster

-

-

-

5

External Facade

-

-

-

6

Internal Wall Partition

-

-

-

7a

Field Window Watertightness Test (WTT)

1,000 m2

20

100

Conducted by BCA. A sample is defined as 2m length of joint.

7b

Field Window Watertightness Test (WTT)

-

25%

-

Self-Testing with declaration by Qualified Person

8a

Wet Area Water-tightness Test

-

20

100

• 20% of all bathrooms and/or toilets (by location) • all will be tested if < 20 nos • not required for non-housing project if < 20 nos

8b

Wet Area Water-tightness Test

-

100%

-

• Self-Testing with declaration by Qualified Person • Including flat roof

9

Internal Wet Area Waterproofing Process

-

-

-

In-process assessment based on approved Method Statement

10

Pull-Off-Test for Internal Wall tiles

10,000 m2

1 set

5 sets

Only pre-packed plaster used. Declaration by Qualified Person Precast or System Formwork or Cladding Facade. Declaration by Qualified Person Drywall or Precast panel partition. Declaration by Qualified Person

5 tiles per set (by location)

A location for internal finishes assessment is a functional space of a building such as a room, hall, toilet, kitchen, yard, corridor or lobby. Locations are further categorised into three types: Principal locations are major functional places such as halls and rooms. Circulation locations include lift lobbies, corridors and staircases. Service locations are utility areas such as toilets, kitchens, balconies and yards.

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CONQUAS® The computed number of locations will be distributed according to "Principal", "Circulation" and "Service" based on the percentages set out in the four categories of buildings as below:

CAT A

CAT B

CAT C

CAT D

Non-Housing

Public Housing

Landed Properties

40%

60%

40%

40%

15%

40%

15%

40%

40%

25%

20%

25%

20%

20%

Commercial Industrial Institution Others

Housing

Principal

60%

Service Circulation

Locations

Scoring of internal finishes is based on the defects groups as shown in Appendix 4 'Defects Grouping Guide for Assessment of Internal Finishes'. In general, any item which is not available in a project will not be considered for scoring. For such case, the architectural score will be prorated accordingly. However, any available item that is not offered for assessment will be considered as failed and no points awarded. An item under assessment will be considered failed if it does not meet the standards. In addition, any item found to be defective functionally such as evidence of water seepage in the window, slab, ceiling or roof, is considered to have failed the assessment. Likewise for a particular defect that is found excessive in an item (say excessive cracks on a wall). For the assessment of roof, a minimum 50% of the total number of buildings will be assessed. This applies to the assessment of external walls where a minimum 50% of the total number of buildings will be required. For a building, the external wall will be divided into 4 walls for assessment. The External Works assessment consists of the following locations: (a) (b) (c) (d) (e) (f) (g) (h) (i) (j) (k)

Link-way / Shelter - 10m length section per sample and minimum 2 samples Apron & Drain - 10m length section per sample and minimum 2 samples Roadwork & Carpark - 10m length section per sample and minimum 1 sample Footpaths & Turfing - 10m length section per sample and minimum 2 samples Playground - 1 location Court - 1 location Fencing & Gate - 10m length section per sample and minimum 1 sample Swimming Pool - 10m length section per sample and minimum 1 sample Club House - 1 location Guard House - 1 location Electrical Substation - 1 location

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Each item in the External Works will be assessed separately and all the locations listed above must be assessed where applicable. Under the material & functional tests, self-testing items like field window water-tightness test for 25% of windows and 100% wet area watertightness test (including flat roof) and the use of pre-packed plaster for all plastering works are based on declaration by the project Qualified Person (QP). In general, declaration on passing for self-testing is based on first-time-right basis. Points for design/material choices such as external facade and internal wall partition are awarded based on declaration by the project Qualified Person (QP). The computation is as follows:

Design/ Material Choice

Formula

External Facade (Precast or System Formwork or Cladding Facade)

Precast/System Formwork/Cladding area x 1 point Total area of facade

Internal Wall Partition (Drywall or Precast Panel Partition)

Drywall/Precast Panel Partition area x Allocated point* Total area of internal partition (Excluding wet areas)

*Allocated point is as follows: Drywall: 1 point Other lightweight partitions (with skim coat): 0.9 point Other lightweight partitions (with plastering): 0.6 point

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3.4 M&E Works Assessment The M&E Works assessment will be carried out in two stages: during the construction of structural works and upon completion of the building. The assessment covers the following areas, with their weightages allocated in accordance with the four categories of projects: M&E Elements Electrical ACMV Fire Protection Plumbing & Sanitary Basic Fittings Sub-total Weightage Performance Testing Weightage Total

CAT A

CAT B

CAT C

M&E Works Assessment 15 15 10 20 20 10 10 10 15 15 20 15 15 60 75 75 100 50% 50% 100% M&E Performance Test Assessment 100 100 50% 50% 100% 100% 100%

CAT D 10 10 80 100 100% _ 100%

Note: "-" means that no assessment on that M&E elements is required.

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CONQUAS® Points allocated under each element of the M & E works assessed, regardless of building category, will follow these guidelines: Element Electrical 1. Embedded conduit 2. Main cables 3. Surface conduits 4. Cable tray, ladder & trunking 5. Distribution board ACMV 1. Air handling unit 2. Pump 3. Cooling tower 4. Chiller 5. Pipework 6. Split unit / Window air conditioner 7. Air-con comfort 8. Ductwork 9. Fire-rated duct 10. Dampers 11. Fire Dampers 12. Flexible ducts 13. Flexible connectors Fire Protection 1. Wet / Dry riser 2. Sprinkler 3. Fire Alarm 4. Hosereel Plumbing & Sanitary 1. Concealed pipes 2. Exposed pipes 3. Water tank 4. Pump

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Points Allocated 2 1 2 2 4 2 1 1 1 1 3 2 4 1 2 1 3 1 2 2 1 2 2 5 1 1

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Performance Testing, covering Electrical, ACMV, Fire Protection and Sanitary & Plumbing, is assessed based on "Get-It-Right-First-Time" principle. The assessment will be based on the percentage of tests passing the first inspection for each type of test. The score will be pro-rated as follow: Ave % Passing at First Attempt 80% or below 80% < X < 100% 100%

% of Performance Test Score 0% (X-80)/20 x 100% 100%

Note: "X" means the average percentage of passing at first attempt.

The assessment of Basic M&E Fittings will be carried out during the Internal Finishes assessment.

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Like the Architectural Works, sampling of M&E works will be determined based on the four categories of buildings as per the guidelines below:

Electrical 1. Embedded conduit 2. Main cables 3. Surface conduits 4. Cable tray, ladder & trunking 5. Distribution board ACMV 1. Air handling unit 2. Pump 3. Cooling tower 4. Chiller 5. Pipework 6. Split unit / Window air conditioner 7. Air-con comfort 8. Ductwork 9. Fire-rated duct 10. Dampers 11. Fire Dampers 12. Flexible ducts 13. Flexible connectors Fire Protection 1. Wet / Dry riser 2. Sprinkler 3. Fire Alarm 4. Hosereel Plumbing & Sanitary 1. Concealed pipes 2. Exposed pipes 3. Water tank 4. Pump Minimum Samples Maximum Samples

CAT A

CAT B

CAT C

CAT D

1,000 m2 per sample

1,500 m2 per sample

3,500 m2 per sample

3,500 m2 per sample

2+ 1 1+ 1+ 2+

2+ 1 1+ 1+ 2+

1+ 1 1 1 1 2+ 1+ 3+ 1 1+ 1 2 1

2+ 1+ 1+

2+ 1+ 1 1 1 1

1+ 1 1

3+ 2+

1+ 1+ 1 1+

1+ 1 1 1+

1+

1+ 4+ 1 1

1+ 4+ 1 1

4+ 1 1

35 70

25 50

10 20

1+

10 20

Remarks : + means to be repeated for additional samples required Note : Basic M&E Fittings - 500 m2 per sample with min 30 and max 150 samples

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3.5 Bonus Points (a) Certified QM/CONQUAS Personnel CONQUAS bonus point is awarded for projects that employ certified personnel. This is to facilitate quality achievement and encourage deployment of competent certified personnel on site.

Requirement

Bonus Point

Certified CONQUAS Supervisor 0.15 Certified QM/CONQUAS Supervisor 0.3 • A supervisor can only be deployed on one project at any time • Supervisor must be deployed for minimum 75% of project duration • CONQUAS Manager Certified 0.4 Certified QM/CONQUAS Manager 0.6 • A manager can be deployed for maximum of 2 projects at any time • Manager must be deployed for minimum 75% of project duration • Maximum 1.0 Note: 1. Both employer and employee must declare the personnel was deployed for the minimum duration as specified. 2. Where required, additional documents and records shall be furnished for verification. (b) Design/Material Choices Bonus points are given to projects using better buildable designs which facilitate higher quality achievement. Requirement Use of precast elements supplied by SCI Accredited Precasters (100% of precast elements) Use of Prefabricated Bathrooms (at least 65% of toilets)

Bonus Point 1.0* 1.5**

* Bonus point is subject to weightage for Structural Works. ** Bonus point is subject to weightage for Architectural Works.

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(c) Quality Mark (QM) Projects Bonus points are given to the project according to the quality rating achieved under the QM tiered rating scheme. Requirement

Bonus Point*

QM STAR

1.5

QM EXCELLENT

1.0

QM MERIT

0.5

*Bonus point is subject to weightage for Architectural Works

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3.6 Computation of CONQUAS Score Below is an example of how a project’s CONQUAS score will be computed: Scenario: Project Type Structural System

-

Roofing System Nos of Toilet

-

External Wall Internal Wall

-

Commercial (CAT A) Reinforced Concrete system with 31% precast concrete volume and steelworks at 75% to 25% cost ratio Flat Roof - 10 nos (100% Prefabricated Bathrooms supplied by Accredited Precaster) Cladding system Brickwall

Step 1: Computation of Structural Score Structural Works (Reinforced Concrete Structure) Formwork/Rebar (69% concrete volume) Precast (31% concrete volume) Finished Concrete Concrete Quality Steel Reinforcement Quality NDT - UPV for concrete uniformity NDT - Electro-Covermeter test for concrete cover Total

Weightage % 0.69x35% = 24.1% 0.31X35% = 10.9% 25 5 5 15 15 100

Structural Works (Structural Steelwork) Main Member/Partially Assembled Component Metal Decking (not used) Erection Tolerances Corrosion & Fire Protection Welding Test Reports Total Pro-rated Total

Weightage % 40 10 10 20 80 100

Score 22.3 8.0 20.5 5.0 5.0 10.5 12.5 83.8 Score 33.2 NA 8.3 10.0 19.5 71 88.8

The Structural Score will be proportioned by the cost ratio as follows: Structural System Reinforced Concrete Works Structural Steelworks Accredited Precaster Structural Score

Effective date: 1st Dec 2014

(A) Individual Score 83.8 88.8 1.0

(B) Cost Proportion 75% 25% -

(A) X (B) 62.9 22.2 1.0 86.1

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Step 2: Computation of Architectural Score Architectural Works Floors Internal Walls Ceilings Doors Windows Components Roof External Walls External Works Pre-packed Plaster Field Window Water-tightness Test (WTT) - BCA Testing - Self-Testing Wet Area Water-Tightness Test - BCA Testing (NA as <20 nos for non-residential) - Self-Testing Internal Wet Area Waterproofing Process Pull-Out-Test for Internal Wall Tiles Cladding Facade Internal Wall Partition (Drywall or Precast Panel Partition) Sub-total = (100-4) Pro-rated Total = (68.1/96) 100% Prefabricated Bathroom Architectural Total

Weightage % 16 16 6 6 6 6 4 11 6 1

Score

7 2

5.8 1.4

1 2 4 1

NA 1.0 2.0 3.2 1.0

1

0.0

96 100 100

68.1 70.9 1.5 72.4

Cat A

Score

15% 20% 10% 15% 15% 75% 50%

12.2 18.4 8.8 11.2 12.8 63.4 42.3

100% 50% 100%

86.9 43.4 85.7

9.3 9.0 5.8 3.6 4.1 4.6 2.5 9.3 4.5 1.0

Step 3: Computation of M&E Score M&E Elements M&E Works Assessment Electrical ACMV Fire Protection Plumbing & Sanitary Basic Fittings Sub-total Weightage (a) M&E Performance Test Assessment Performance Test Weightage (b) Total (a+b):

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CONQUAS®

Step 4: Computation of Bonus Points for Certified CONQUAS/QM Personnel Certified Personnel Deployed

Bonus Point

Certified CONQUAS Supervisor x1 Certified QM/CONQUAS Supervisor x1 Certified QM/CONQUAS Manager x1 Total

0.15 0.3 0.6 1.0 (max)

Step 5: Computation of Final CONQUAS Score

Area of Works/Component Structural Works Architectural Works M&E Works Certified QM/CONQUAS Personnel CONQUAS Score

(A) Actual Score 86.1 72.4 85.7 -

(B) CAT A

(A) X (B)

20% 60% 20% -

17.22 43.44 17.14 1.0

100%

78.8

3.7 Publication of CONQUAS Scores The overall CONQUAS scores of projects are published and accessible for viewing at BCA’s website. However projects scoring 95 points or higher will only be shown as “CONQUAS ”. Higher CONQUAS scores generally reflect better workmanship. However scores beyond 95 points are often achieved at significant cost and effort disproportionate to the incremental achievement in quality. The “CONQUAS ” rating facilitates setting realistic quality benchmarks balanced with productivity and cost considerations.

Effective date: 1st Dec 2014

22

Appendix 1a

QUALITY STANDARDS FOR STRUCTURAL WORKS Part 1: Reinforced Concrete Structures

Item* 1

Formwork

1a

Formwork dimensions and openings for services

1b

1c

Alignment, plumb and level

Condition of formwork, props & bracing

2

Reinforcement (cast insitu & Precast)

2a

Main & Secondary rebars

Standards

1)

Tolerance for cross-sectional dimensions of cast in-situ & precast elements: +10mm / -5mm

2)

Tolerance for penetration / opening for services: +10mm for size and ±25mm for location

3)

Tolerance for length of precast members (major dimension of unit): • Up to 3m: ±6mm • 3m to 4.5m: ±9mm • 4.5m to 6m: ±12mm • Additional deviation for every subsequent 6m: ±6mm

1)

Tolerance for departure of any point from its position: 10mm

2)

Tolerance for plumb: 3mm / m, maximum 20mm

3)

Maximum deviation of mean level of staircase thread to temporary bench mark: ±5mm

4)

For cast in-situ elements, the deviation of level of any point from the intended level: ±10mm

1)

Formwork must be free from defects

2)

Before concreting, the interior must be free from debris

3)

All formwork joints must not have gaps to prevent leakage

4)

There must be adequate support, bracing and tie-back for the formwork to prevent bulging or displacement of structural elements

1)

According to structural drawings (numbers / sizes)

2)

Spacing of bars not more than that specified

2b

Anchorages & lap lengths

1)

Required lap length not less than that specified

2c

Cover provision

1)

According to specifications with tolerance of +5mm

2d

Links, stirrups and trimming bars

1)

According to structural drawings (numbers / sizes)

Effective date: 1st Dec 2014

23

Appendix 1a

Item*

2e

Rebar Condition

3

Finished Concrete (cast in-situ & Precast)

3a

Dimension for elements / opening for services

3b

Alignment, plumb and level

Effective date: 1st Dec 2014

Standards 2)

Spacing of links not more than specified

1)

Rebars must be securely and properly tied in place

2)

Rebars must be freed from concrete dropping, corrosion etc

1)

Tolerance for cross-sectional dimension of cast in-situ and precast elements: +10mm / -5mm

2)

Tolerance for opening: +10 for size and ±25mm for location

3)

Tolerance for length of precast members (major dimension of unit): • Up to 3m: ±6mm • 3m to 4.5m: ±9mm • 4.5m to 6m: ±12mm • Additional deviation for every subsequent 6m: ±6mm

4)

Straightness or bow (deviation from intended line) of precast member: • Up to 3m: 6mm • 3m to 6m: 9mm • 4.5m to 6m: 12mm • Additional for every subsequent 6m: 6mm

5)

Squareness of precast member – Difference between the greatest and shortest dimensions should not exceed the following: Length of shorter sides • Up to and including 1.2m: 6mm • Over 1.2m but less than 1.8m: 9mm • 1.8m and over: 12mm

6)

Twist of precast member – Any corner should not be more than the deviation stated from the plane containing the other 3 corners: • Up to 600mm wide and 6m in length: 6mm • Over 600mm wide and for any length: 12mm

7)

Flatness: 6mm per 1.5m

1)

Tolerance for departure of any point from its position: ±10mm

2)

Tolerance for plumb: 3mm / 1m, maximum 20mm for floor to floor height and 40mm for the entire building height

3)

Maximum deviation of mean level: ±10mm

4)

For cast in-situ elements, the maximum deviation of levels 24

Appendix 1a

Item*

Standards within the element: 10mm

3c

Exposed surface

4

Precast Specific Requirements

4a

Lifting points/inserts

4b

4c

4d

Sleeve system/connections

Interface/joint requirements

Cast-in steel items/welded & bolted connections

Effective date: 1st Dec 2014

5)

Camber at mid-span: according to specifications

1)

Should not have visual exposure of groups of coarse aggregates resulting from grout leakage

2)

Cold joint & formwork joint must be smooth

3)

No bulging of structural elements

4)

All formwork, nails, zinc strips, etc must be removed

5)

No cracks or damages

1)

Tolerance for position: ±20mm from centre line location in drawing

2)

Lifting devices and inserts free from damages

1)

Tolerance for position: ±6mm from centre line location in drawings

2)

Bar protrusion length according to requirements. No bending, cranking or damages to bars

3)

Bars free from concrete droppings or corrosion

4)

Sleeves, grout holes, grout tubes not congested with debris

1)

Joint taper: • Over 3m length: 6mm • Maximum for entire length: 9mm

2)

Alignment of horizontal and vertical joint: ±6mm

3)

Jog in alignment of matching edges: 6mm

4)

Sitting of element: according to specifications

5)

Installation of sealant and waterproofing: according to specifications

1)

Tolerance for position of cast-in steel items: ±6mm from centre line location in drawings

2)

Tolerance for position of openings for bolt connections: ±3mm from centre line location in drawings

3)

Relevant requirements in CONQUAS steelwork standards to be used where applicable

25

Appendix 1a

Item*

Standards

5

Structure Quality

5a

Concrete Cube test

1)

For every pour of concrete, test cubes results at 28 days must satisfy the passing criteria as specified in the contract. The summary of test reports (Form A) must be endorsed by the project’s structural QP (Qualified Person)

5b

Reinforcement (Rebar)

1)

To pass the tensile strength test for all the reinforcement bars used as according to the contract specifications. The summary of test reports (Form A) must be endorsed by the project’s structural QP (Qualified Person)

2)

All the welded steel fabric used to comply with the contract specifications.

3)

No non-conforming reinforcement detected through test records has been installed in the structure

Effective date: 1st Dec 2014

26

Appendix 1a

Item*

Standards

6

Non-destructive testing

6a

Ultra Pulse Velocity test for Concrete Uniformity

6b

Electro-Covermeter test for concrete cover

1)

To conduct NDT using ultrasonic pulse velocity (UPV) to check the degree of uniformity of hardened concrete

2)

5 columns per set and 2 readings per column

3)

Assessment is based on the difference between the 2 UPV readings within a column shall not exceed 0.05 km/s

4)

Method as per SS 78

1)

To check hardened concrete cover for reinforcement bars after casting: minimum 25mm or higher as according to specification

2)

5 structural samples per set including:

a

3 for slab soffit @ 4 readings each

b

1 for column @ 2 readings each on both axis of the column

c

1 for beam @ 2 readings each on the soffit and one side of the beam

3)

For each reading within a structural sample, full point for ±5mm and half point for >±5mm to ±8mm. However, no points will be awarded if any of the 4 readings within the structural sample exceeds + 12mm)

4)

Method as per SS 78

For the assessment of concrete cube test results, the percentage of points shall be awarded based on the percentage of non-compliance as tabulated in the table below: Percentage of Points awarded

Percentage of non-compliance

100%

0 - 2.5%

75%

2.6 - 5.0%

50%

5.1 - 7.5%

25%

7.6 - 10%

0%

> 10%

* An item is deemed to have failed if any one of the standards is not met.

Effective date: 1st Dec 2014

27

Appendix 1b

QUALITY STANDARDS FOR STRUCTURAL WORKS Part 2: Structural Steel Works

Item* 1

Main member/Partial assembled component

1a

Physical dimensions

1b

1c

1d

Type and condition

Welding

Bolting

Effective date: 1st Dec 2014

Standards

1)

Cross sectional tolerance should not be less than the structural steel specifications or approved plan

2)

Tolerance for length of structural steel member: ±3mm

3)

Tolerance for bolt hole size: • ≤2mm for bolt diameter < 24mm • ≤3mm for bolt diameter ≥ 24mm Tolerance for bolt hole position: ±2mm

1)

According to the structural steel specifications

2)

Surface preparation shall meet the surface roughness specifications

3)

Material used must be traceable to its original mill certificates

1)

Weld size, length and profile shall meet the structural steel specifications and drawings

2)

Visual inspection shall meet the structural steel specifications

3)

All weld shall follow approved welding procedures

4)

All welding must be done by qualified welders

1)

Bolts and washers, type, size and number shall be according to the structural steel specifications

2)

Drilled holes shall be free from burrs

3)

The condition of bolted parts adjacent to the bolt heads, nuts, flat washers, connection gussets and splice plates shall be free from oil, paint, and loose mill scales or otherwise specified by the structural steel specifications

4)

Gap between adjacent parts shall not exceed 2mm

5)

Bolts shall be tightened to specified torque or as specified by the structural steel specifications

6)

Threaded bolts protruding at least one thread length with washers

28

Appendix 1b

Item* 2

Metal decking

2a

Type and condition

2b

Shear studs

Standards

1)

Correct type and thickness of metal decking used

2)

All decking joints must not have gaps

3)

All metal decking must be properly secured in place

4)

Metal decking must be free from defects and visible damages

5)

Before concreting, the decking must be free from grease, oil, paint, and all other foreign materials

6)

All accessories such as pour stop, end closures and cover plates must be in place before concreting

1)

Correct number and type of shear studs used

2)

Spacing and position according to approved plan

3)

Strength of shear stud welds not less than specified

4)

All welds should show a full 360-degree weld fillet. All welds free from visible damages

1)

According to structural steel specifications or approved plan

2c

Lapping and deck openings

3

Erection tolerances

3a

Column verticality

1)

Tolerance for verticality: ±H/600 or 5mm, maximum ±25mm; where H is the floor to floor height in mm.

3b

Column position

1)

The position in plan of a steel column at the base shall not deviate from the specified position by more than 10mm along either of the principal setting out axes

3c

Beam level

1)

Maximum deviation of level at each end of the same beam: ±5mm

2)

The level of the top of the steelwork at any storey shall be within ±10mm of the specified level

1)

Beams shall not deviate from their specified positions relative to the column to which they are connected by more than 5mm

3d

Beam position

Effective date: 1st Dec 2014

29

Appendix 1b

Item*

Standards

4

Corrosion and fire protection

4a

Thickness of coating

1)

Average thickness of the coating or the protective layer must not be less than specified

4b

Condition

1)

No visible damages

2)

No spalling of coating or protective layer from structural steel members

1)

Reports for all critical welding joints from the specified contract requirements must be submitted

2)

Test reports must comply with the acceptable criteria and must be endorsed by the project’s structural QP.

5

Welding test reports#

# For test records, the following table would be used to determine the points awarded: Points awarded 20 15 10 5 0

Percentage of elements checked which does not 0% 0%15%

* An item is deemed to have failed if any one of the standards is not met.

Effective date: 1st Dec 2014

30

Appendix 1c

QUALITY STANDARDS FOR STRUCTURAL WORKS Part 3: Pre-stressed Concrete

Item* 1

Condition of tendons & anchorages

Standards 1)

All pre-stressing strands and wires should comply with the specified standards and requirements and be free from loose rust, oil, tar, paint and any foreign objects

2)

All tendon anchorage are to comply with the specified standards and protected from corrosion Thread parts to be greased wrapped and tapped holes protected until use

2

3

4

Installation of sheathing

Stressing & Grouting process

Debonding

1)

Sheathing properly secured and protected and free from damage or puncture

2)

Sheathing profile according to drawings throughout the length with position tolerance: ±5mm

3)

Splice to sheathing shall be mortar tight

4)

Air vents or grout tubes provided according to the drawing

1)

Tendon ducts clean and free from foreign objects and tendon free moving in the duct

2)

Strands stressed to the final pressure / elongation within the specific % accuracy of the stipulated value

3)

All grouting operations of the tendons must be smooth and achieved without need to flush out in the first grouting

1)

Open ends of debond tubes over the debond length of strands sealed

2)

Debond lengths according to the drawings

3)

Debonding materials not punctured or damaged

* An item is deemed to have failed if any one of the standards is not met.

Effective date: 1st Dec 2014

31

Appendix 2

QUALITY STANDARDS FOR ARCHITECTURAL WORKS Part 1: Internal Finishes

Item* 1

Floors

1a

General Requirements

1b

1c

Screed finish

Tiled finish

Effective date: 1st Dec 2014

Standards

1)

Finishing  No stain marks  Consistent colour tone  Floor divider provided where required

2)

Alignments & Evenness  Evenness of surface (not more than 3mm per 1.2m)  Falls in wet areas should be in right direction  No ponding in falls for wet area  For staircases, the variance in lengths of threads and risers must not exceed 5 mm; nosing must be straight  Skirting size and joint aligned with floor if of same material

3)

Crack & Damages  No visible damage / defects

4)

Hollowness / Delamination  No hollow sound when tapped with a hard object  No sign of delamination

5)

Jointing  Consistent skirting thickness  No visible gap between wall & skirting

1)

Surfaces should not be unduly rough or patchy

2)

No visible trowel marks

3)

Expansion joints should be provided at interval as stated by architect

1)

Consistent colour and neat pointing

2)

No hollow sound when tapped with a hard object

3)

Joints are aligned and consistent with skirting and wall tiles

4)

Consistent joint size

5)

Lippage between 2 tiles should not be more than 0.5 mm

6)

Expansion joints should be provided at interval as stated by architect

32

Appendix 2

Item* 1d

1e

1f

Timber floor

Carpet

Raised Floor

Effective date: 1st Dec 2014

Standards 1)

No warpage

2)

Timber strips to rest firmly on joists or screed

3)

No visible gaps in between timber strips

4)

Edges of the floor to be properly sealed

1)

Stretched and even surface

2)

Joint should not be visible

3)

Proper anchoring at all edges

1)

No loose floor panels

2)

No protrusion / potential of tripping over floor panels

3)

No jolting or rocking panel

33

Appendix 2

Item* 2

Internal Walls

2a

General

2b

2c

2d

2e

Plaster Finish

Tiled Finish

Cladding

Architectural Coating

Effective date: 1st Dec 2014

Standards

1)

Finishing  No stain marks  Consistent colour tone  No rough / patchy surface

2)

Alignments & Evenness  Evenness of surface (not more than 3mm per 1.2m)  Verticality of wall (not more than 3mm per m)  Walls meet at right angles (not more than 4mm over 300mm)  Edges (wall to wall) to appear straight and aligned

3)

Crack & Damages  No visible damage / defects

4)

Hollowness / Delamination  No hollow sound when tapped with a hard object  No sign of delamination

5)

Jointing  Straightness of corners and joints

1)

Surface evenness (not more than 3mm over 1.2m)

2)

No hollow sound when tapped with a hard object.

3)

Surfaces should not be unduly rough or patchy esp no brush / trowel marks

1)

Tile joints aligned and with consistent joint size

2)

No hollow sound when tapped with a hard object

3)

Consistent colour and neat pointing

4)

Lippage between 2 tiles should not be more than 0.5mm

1)

Proper anchorage for panels

2)

Joints aligned and with consistent joint size

3)

Sealant material compatible with cladding

4)

Consistent spacing and within allowable tolerance

1)

Substrate - see plaster finish

2)

Finished texture and colour to be uniform

34

Appendix 2

Item* 2f

2g

2h

2i

2j

2k

Painting

Pre-cast concrete planks

Wall Paper

Glass Blocks

Wood / Timber Panels

Fair-Face Concrete

Effective date: 1st Dec 2014

Standards 1)

Substrate - see plaster finish

2)

Surfaces are evenly painted

3)

Good opacity, no patchiness resulted from touch up works

4)

Free from peeling, blister and chalkiness

5)

No discolouration and fading

1)

Alignment with adjacent planks not more than 3mm

2)

Plane tolerance (3mm / 1.2m)

1)

Stretched and even surface

2)

Joint should not be visible

3)

Proper anchoring at all edges

4)

Edges should be neatly laid and finished

1)

Pointing should be satisfactory

2)

Joint should be even

3)

Glass blocks should be properly aligned

1)

Timber panels to rest firmly on joist or screed

2)

No visible gaps between panels

3)

Edges should be properly aligned and sealed

4)

No warpage

5)

No cracks

1)

Consistent distribution of blowholes for the same sample / surrounding area.

2)

All blowhole sizes to be equal or less than 8mm

3)

Consistent tonality for the same sample / surrounding area

4)

No exposed aggregate

5)

No cracks and damages

35

Appendix 2

Item* 3

Ceilings

3a

General Requirements

3b

3c

Skim Coats / Boarded Ceiling

False ceiling / Grid System

Effective date: 1st Dec 2014

Standards

1)

Finishing  No stain marks  Consistent colour tone  No patchy surface

2)

Alignment & Evenness  Overall surface should be smooth, even, not wavy  Straightness of corners

3)

Crack & Damages  No visible damage e.g spalling, leaks, cracks, etc

4)

Roughness  No rough surface

5)

Jointing Consistent, aligned and neat

1)

Not patchy, with no pin holes and with no trowel marks

2)

Formwork joints are grounded smooth

3)

Paintwork with good opacity and with no brush marks

4)

Access door joints should be sharp and in consistent width

1)

Alignment of rails should be visually straight

2)

Surface should be overall level and even

3)

Chipped surfaces or corners should not be seen

36

Appendix 2

Item* 4

Doors

4a

General Requirements

Standards

1)

Joints & Gap  No visible gaps between door frame and wall  Consistent & neat joints  Consistent gap between door leaf and frame and not more than 5mm  No visible gaps within door leaf and door frame  Consistent and no visible gaps for mitre joints

2)

Alignment & Evenness  Alignment/level with walls  Door frame and leaf to flush  Door and frame corners maintained at right angles  No rattling sound when door is closed

3)

Material & Damages  No stain marks and any visible damage  No sags, warps on door leaf  Fire stop provided where necessary  Door joints and nail holes filled up, properly sanded down and with good paint finish (including on top and bottom of door leaf and consistent in colour)  Glazing clean and evenly sealed with gasket  No sign of corrosion for metal frame  Consistent colour tone

4)

Functionality  Ease in opening, closing and locking  No squeaky sound during swinging the leaf

5)

Accessories Defects  Lock sets with good fit and no stains  No sign of corrosion in ironmongery  No missing or defective accessories

Note 1: Civil defence shelter door will be considered as part of wall finishes Note 2: Metal gate will be assessed as component

Effective date: 1st Dec 2014

37

Appendix 2

Item* 5

Windows

5a

General Requirements

Effective date: 1st Dec 2014

Standards

1)

Joints & Gap  No visible gap between window frame and wall  Consistent gap between window leaf and frame and not more than 5mm (timber window only)  No visible gaps within window leaf and frame  No visible gaps between window leaf and frame  Neat joint between window and wall internally and externally  Consistent and no visible gaps at mitre joints

2)

Alignment & Evenness  Alignment / level with wall openings  Window leaf and frame corners maintained at right angles

3)

Material & Damages  No stain marks and any visible damage / defects  Louvre windows with glass panels of correct lengths  Glazing clean, evenly sealed with putty or gasket for aluminium windows

4)

Functionality  Ease in opening, closing and locking  No sign of rainwater leakage  No squeaky sound during swinging the leaf

5)

Accessories Defects  Lock sets with good fit and aligned  No sign of corrosion  No missing or defective accessories  Countersunk screws levelled and flushed. No overtightened screws  Stainless steel screws at hinges for swing window

38

Appendix 2

Item* 6

Components

6a

General Requirements

Standards

1)

Joints & Gap  Consistent joint width & neat joint  No visible gap  Welding joints grounded or flushed

2)

Alignment & Evenness  Level and in alignment

3)

Material & Damages  No stain marks  No visible damage / defects  Consistent in colour tone

4)

Functionality  Functional, secured and safe

5)

Accessories Defects  No missing accessories  No sign of corrosion  No visible damages / defects

* An item is deemed to have failed if any one of the standards is not met

Effective date: 1st Dec 2014

39

Appendix 2

QUALITY STANDARDS FOR ARCHITECTURAL WORKS Part 2: Roof Item*

1

Construction

1a

General Requirements

1b

1c

Flat Roof

Pitched Roof

Effective date: 1st Dec 2014

Standards

1)

Stain / Painting  No stain marks  Good paint works

2)

Rough / Uneven / Falls  Look smooth and with no tool marks  Even and level esp no potential in stripping  Good falls in right direction

3)

Crack / Chip / Damage  No visible damages / defects

4)

Joint / Sealant / Alignment  Consistent joint width, neat & aligned

5)

Chokage / Ponding  No sign of chokage and ponding

6)

Construction  No sign of leaking  Proper dressing for any protrusion  Neat & secured installation of fixtures

1)

Ponding less than 3mm

2)

Surface to level to avoid tripping

3)

Proper dressing for any protrusion

4)

Openings to be sealed to prevent pest invasion

5)

Clean and no stain marks

1)

No leaking

2)

No rust or stains

3)

Good painting to roof structural members

4)

Roof tiles in alignment

5)

Openings to be sealed to prevent pest invasion

40

Appendix 2

Item*

1d

1e

Waterproofing (exposed)

Gutters

Standards 6)

Consistent colour tone

7)

Proper dressing for any protrusion

1)

Should be evenly installed, no sharp protrusion

2)

Complete adhesion to base

3)

Good laps at joints and proper vertical abutment details

4)

No leaking and sign of damage to membrane/coating

5)

Clean and no mortar stains

6)

No paint defects

1)

No ponding and chokage

2)

No cracks, chips and any other visible damages / defects

3)

RWDP inlet should be lower than the surrounding gutter invert level

4)

Gutter and RWDP inlet to be covered to prevent chokage where practical

5)

Clean and no cement stains

* An item is deemed to have failed if any one of the standards is not met

Effective date: 1st Dec 2014

41

Appendix 2

QUALITY STANDARDS FOR ARCHITECTURAL WORKS Part 3: External Wall Item*

1

General Requirements

Standards

1)

Evenness / Roughness  Overall surface should be even, not wavey & not patchy

2)

Staining / Painting / Finishing  No visible stain marks  Good paint works

3)

Cracking / Damages  No visible damage / defects

4)

Jointing / Alignment  External features visually in alignment  Corners of wall maintained at right angles and straight  Consistent joint width, neat & aligned

2

Plaster Finish

1)

As above

3

Tiled Finish

1)

Tile joints aligned and between 2-4mm wide unless specified

2)

Plumb tolerance and evenness of surface (3mm / 1.2m)

1)

Gaps around openings to be properly sealed

2)

Joints of regular widths as specified

3)

Plumb tolerance as specified

4)

Evenness of surface, no dents or scratches

5)

Sealant material compatible with cladding

1)

10mm joint with pointing

2)

Weepholes are provided as specified

3)

No mortar droppings and other stains

4)

No efflorescence

4

5

Claddings / Curtain Walls

Facing Brickwork

Effective date: 1st Dec 2014

42

Appendix 2

Item*

6

7

8

Architectural Coating

Painting

Fair-Faced Concrete

Standards

1)

Substrate - see plaster finish

2)

Finished texture and colour to be uniform

3)

No paint drips and other stains

1)

Substrate - see plaster finish

2)

Surfaces are evenly painted; no patchiness due to touch up work

3)

Good opacity, no discolouring and free from peeling

1)

No exposed aggregate

2)

Consistent tonality when viewed as a whole

* An item is deemed to have failed if any one of the standards is not met

Effective date: 1st Dec 2014

43

Appendix 2

QUALITY STANDARDS FOR ARCHITECTURAL WORKS Part 4: External Works

Item* 1

1a

1b

General Requirements (basis for assessment)

Link-Way / Shelter

Apron & Drain

Effective date: 1st Dec 2014

Standards 1)

No stain marks and visible damages / defects

2)

Finishes must be even, level , align & consistent

3)

Consistent joints width and neat

4)

Paintworks with good opacity, no patchiness and brush marks

5)

Constructed according to Contract Specifications

6)

Fixtures installed must be safe, secured and functional

7)

Standards defined under Part 1: Internal Finishes, Part 2: Roof and Part 3: External Wall shall apply for similar items

1)

Floor as per Internal Finishes - Floor

2)

Column as per Internal Finishes - Wall

3)

Ceiling as per Internal Finishes – Ceiling

4)

Other Finishes as per Internal Finishes – Components

5)

M&E Fitting as per M&E Works – Part 5 Basic M&E Fittings

1)

Drain  Free flowing and no ponding of water

2)

Drain Cover  level and do not jolt or rock  Gaps between drain covers and side of drain between 5-10mm wide  Drain grating properly painted

3)

Apron 1  Bitumen joints with neat edges and sufficient length  No ponding

4)

Apron 2 – as per Apron 1

5)

Inspection Chamber  Inspection chambers are level with surrounding without depression and with tolerance of 20mm for protrusion  Covers to be level with frames

44

Appendix 2

Item* 1c

1d

1e

Roadwork & Carpark

Footpaths & Turfing

Playground

Effective date: 1st Dec 2014

Standards 1)

Side Drain as per 1b Apron & Drain

2)

Road Surface  No ponding  Road painting according to drawings; dimensional tolerance of 5mm  Gaps between aeration slabs properly filled up with sand  Aeration slabs stable and not broken

3)

Kerbs – as per General Requirements

4)

Road Sign  Provided according to specifications  Firm and secured at base – with footing if required  Metal parts below ground are corrosion treated

5)

Lightings – as per 1c Road Sign

1)

Footpath as per Internal Finishes - Floor

2)

Turfing  No depression or bald patches  Turfing done evenly, no dead grass or weeds

3)

Lightings as per 1c Road Sign

4)

Fencing & Railing  As per 1c Road Sign  Wire fencing is PVC covered  Footings provided for supports  Vertical tolerance (4mm / 1.2m)

5)

Other Fixtures  as per Internal Finishes - Components

1)

Floor as per Internal Finishes - Floor

2)

Permanent Fixture1 as per Internal Finishes Components

3)

Permanent Fixture2 as per Internal Finishes Components

4)

Lightings as per 1c Road Sign

5)

Signage as per Internal Finishes - Components

45

Appendix 2

Item*

1f

1g

1h

1i

Court

Fences & Gates

Swimming Pool

Club House

Effective date: 1st Dec 2014

Standards

1)

Floor 1 as per Internal Finishes - Floor

2)

Floor 2 as per Internal Finishes - Floor

3)

Signage as per Internal Finishes - Components

4)

M&E Fitting as per M&E Works – Part 5 Basic M&E Fittings

5)

Permanent Fixture as per Internal Finishes - Components

1)

Fence Left as per 1d – item 4)

2)

Gate as per Internal Finishes - Components

3)

Fence Right as per 1d – item 4)

4)

M&E Fitting as per M&E Works – Part 5 Basic M&E Fittings

5)

Signage as per Internal Finishes - Components

1)

Side Drain as per Internal Finishes - Floor

2)

Foot Path 1 as per Internal Finishes - Floor

3)

Floor Path 2 as per Internal Finishes - Floor

4)

M&E Fitting as per M&E Works – Part 5 Basic M&E Fittings

5)

Other Fixture as per Internal Finishes - Components

1)

External Wall 1 as Part 3 External Wall

2)

External Wall 2 as Part 3 External Wall

3)

External Wall 3 as Part 3 External Wall

4)

External Wall 4 as Part 3 External Wall

5)

Apron & Drain as per 1b

46

Appendix 2

Item*

1j

1k

Guard House

Electrical Substation

Standards

1)

External Wall 1 as Part 3 External Wall

2)

External Wall 2 as Part 3 External Wall

3)

Apron & Drain as per 1b

4)

Gantry as per Internal Finishes - Components

5)

Other Fixture as per Internal Finishes - Components

1)

External Wall 1 as Part 3 External Wall

2)

External Wall 2 as Part 3 External Wall

3)

External Wall 3 as Part 3 External Wall

4)

External Wall 4 as Part 3 External Wall

5)

Apron & Drain as per 1b

* An item is deemed to have failed if any one of the standards is not met

Effective date: 1st Dec 2014

47

Appendix 2

QUALITY STANDARDS FOR ARCHITECTURAL WORKS Part 5: Material & Functional Tests

Item*

Standards

1

Plastering

1)

Use Pre-packed Plaster only.

2

Field Window Watertightness Test

1)

No sign of leakage using BCA's Window Water-tightness Test method. Leakage is defined as “any appearance of uncontrolled water, other than condensation, on the indoor face of any part of the wall & window”.

2)

BCA's Water-tightness Test parameters: Water intensity: 300mm/hr : 1 litre/min/m of joint Wind Pressure: 240 Pa Nozzle inclination: 90o to window 1 sample = 2m length of joint Spray duration: 10 minutes

3

Wet Area Watertightness test (i.e. Bathrooms, toilets & flat roof)

1)

No sign of leakage after ponding wet areas over a minimum period of 24 hrs.

2)

Ponding with final finish in-place

4

Internal wet area waterproofing process

1)

According to approved method statement, shop drawings and related BCA’s Good Industry Practices guides

5

Pull-off test (POT)for internal wall tiles

1)

Minimum tensile strength of 0.15 N / mm2

For the assessment of the field window water-tightness test, the number of points shall be awarded based on the percentage of non-compliance as tabulated in the table below : Points Awarded for BCA Field Test (80%)

Points Awarded for Self-Testing (20%)

Percentage of non-compliance

7

2

0%

(15-x)* 7/15

(15-x)* 2/15

0% < x < 15%

0

0

≥ 15%

Note:

No points shall be given if test is not carried out. “x” is the percentage of samples failed.

Effective date: 1st Dec 2014

48

Appendix 2

For the assessment of the wet area water-tightness test, the number of points shall be awarded based on the percentage of non-compliance as tabulated in the table below :

Points Awarded for BCA Field Test (80%)

Points Awarded for Self-Testing (20%)

Percentage of non-compliance

4

1

0%

(2-x)* 4/2

(2-x)* 1/2

0% < x < 2%

0

0

≥ 2%

Note:

No points shall be given if test is not carried out. “x” is the percentage of samples failed.

* An item is deemed to have failed if any one of the standards is not met.

Effective date: 1st Dec 2014

49

Appendix 3

QUALITY STANDARDS FOR M&E WORKS Part 1: Electrical Works

Item* 1

Standards

Embedded Conduits Installation

1)

Conduit ends properly protected

2)

Correct type of conduit installed as per approved sample

3)

Conduit boxes clean and open end plugged / temporarily protected

4)

Coupling joints fastened

5)

Bonding to earth provided for all metallic conduits

Secured Properly

6)

Conduits properly secured

Bent Properly

7)

Conduits properly bent without distortion and damage

Properly Supported

1)

Cables adequately supported

Fire Stop

2)

Fire stops properly installed

Spacing & Secure of Cable

3)

Adequate spacing of cables

1)

Conduit ends properly connected

2)

Metallic conduits properly earthed

3)

Correct type of conduit as per approved sample

4)

Conduits properly bent without distortion and damage

5)

Support / brackets rigidly fitted

6)

Screw used properly fastened

7)

Fire stops properly installed

No Visible Damage

2

Main Cables

No Visible Damage

3

Surface Conduits Installation

Support

Fire Stop

Effective date: 1st Dec 2014

50

Appendix 3 Item* No Visible Damage

4

Standards 8)

Conduits and accessories properly painted

1)

Joints protected against corrosion

2)

Correct type of material used as per approved sample

3)

Metallic trunking properly earthed

4)

Support / brackets rigidly fitted

5)

Screw used properly fastened

6)

Fire stops properly installed

1)

Circuit diagram provided

2)

Proper labelling for panel

3)

Suitable cable termination provided

4)

All live parts to be non-accessible

5)

All exposed metal parts effectively earthed

Cable Tray, Ladder And Trunking Installation

Support

Fire Stop No Visible Damage

5

Distribution Board Circuit Diagram

Cable Termination /Earthing

No Visible Damage

* An item is deemed to have failed if any one of the standards is not met

Effective date: 1st Dec 2014

51

Appendix 3 Part 2: Quality Standards for ACMV Works

Standards

Item* 1

Ductwork Location & Installation

1)

Location and ductwork installed according to approved shop drawings

Paints

2)

Exposed ductwork and hanger properly painted to approved colour code

Support

3)

Ductwork properly supported

1)

Location and ductwork installed according to approved shop drawings

2)

No hanging of other services

3)

Fire-resistant sealed access panel provided to fire-rated enclosure of equipment for maintenance

Location & Installation

1)

Location & installation as per approved shop drawings

Support

2)

Duct properly supported

Sufficient Radius

3)

Bending radius sufficiently wide to prevent tensioning and restriction of the throat

1)

Installed as per approved shop drawings

2)

Provided at ductwork, between AHU/FCU/Fans and related ductwork

3)

Within 50 – 250 mm length

No Visible Damage

2

Fire-Rated Ducts Location & Installation

Access Panel

No Visible Damage

3

Flexible Ducts

No Visible Damage

4

Flexible Connectors Location & Installation

Length Limit No Visible Damage

Effective date: 1st Dec 2014

52

Appendix 3 Item* 5

Standards

Dampers Location & Installation

1)

Location of dampers as per approved shop drawings

2)

Dampers / splitter dampers can be adjusted freely between the open and close position

3)

Access doors provided to all dampers

1)

Location of dampers as per approved shop drawings

2)

Installed as per CP13 and no gap around fire dampers

3)

Dampers in open position and held in position by fusible link.

4)

Access doors provided to all dampers according to CP13

1)

Units are levelled when placed on plinth

2)

Drainage provided/units slightly tilted for condensation

3)

Drain hose connected to the drain pipe

4)

Cool air is not blocked by wall, beam, shelving or other builtin furniture in the room

Seal Penetration

5)

Proper sealant of wall or roof opening after pipes are fixed

No Leakage

6)

No sign of leakage from pipes

Access Door No Visible Damage

6

Fire Dampers Location & Installation

Access Door No Visible Damage

7

Split Unit/Window Air Conditioner Installation

No Visible Damage

Effective date: 1st Dec 2014

53

Appendix 3

Item* 8

9

Standards

Air-Con Comfort o

o

Temperature

1)

Room temperature between 23 C - 25 C or according to specification

Air Flow

2)

Room airflow rate not exceeding 0.25 m/s or according to specification

Relative Humidity

3)

Room relative humidity not more than 60% or according to specification

1)

Unit location & pipe layout installed as per approved shop drawings

2)

Inspection access door for fan, coil, motor and filter

3)

All metal parts properly earthed

4)

Smoke detector installed at the return air stream

5)

Name plate installed with manufacturer's name, serial number and model number

6)

Pipe / duct from AHU must be supported

1)

Location & pipe layout installed as per approved shop drawings

2)

Pump & motor assembly properly installed on inertia block & spring isolator

3)

Guard provided to exposed shafts, coupling & moving parts

4)

Name plate installed with manufacturer's name, serial number and model number

5)

No bad electrical termination

Air Handling Unit Location & Installation

Support No Visible Damage

10

Pump Location & Installation

Electrical Termination No Visible Damage

Effective date: 1st Dec 2014

54

Appendix 3

Item* 11

12

Standards

Cooling Tower Self-Earthing System

1)

Cooling tower completed with self-earthing system for connection to building lightning protection system

Location & Installation

2)

Name plate installed with manufacturer's name, serial number and model number

3)

Location & pipe layout installed as per approved shop drawings

No Visible Damage

4)

Cooling tower clear of all debris

Pipework including Chilled water, Hot water, Steam, Condenser water, Condenser drain, Cold Water make-up, water treatment and refrigerant

1)

Pipe works installed as per approved shop drawing & specifications

Paints & Support

2)

Pipe work provided with drains at each low point and automatic air vents with manual isolating valve at each high point

Fire Stop

3)

Fire stop for passage of pipes at opening for fire resistant walls and floor

4)

Properly painted and supported

1)

Location & pipe layout installed as per approved shop drawing

2)

Chiller to be levelled when placed on plinth or vibration isolators

3)

Chiller fixed securely in position

4)

Correct model, make & capacity

5)

Pipes supported properly by hangers or brackets

6)

Pipe connections follow specified flow direction

No Visible Damage

13

Chiller Location & Installation

Pipe Support & Label

Effective date: 1st Dec 2014

55

Appendix 3

Item* No Leakage

Standards 7)

No sign of leakage

No Visible Damage

* An item is deemed to have failed if any one of the standards is not met

Effective date: 1st Dec 2014

56

Appendix 3 Part 3: Quality Standards for Fire Protection Works

Item*

1

Standards

Wet / Dry Riser Landing Valve

1)

Landing valve must be accessible

2)

Landing valve strapped & padlocked

3)

Labelling for riser door

4)

Landing valve painted red for wet riser / yellow for dry riser

5)

Automatic air release valve provided at highest point of rising main

6)

Riser pipes properly supported

7)

Labelling & painting for riser pipe

8)

Bonding to earth provided for rising main

9)

Proper wall / floor penetration

1)

Location, sprinkler and pipe layouts and sizes installed as per approved shop drawings

2)

Double layer sprinkler for false ceiling >800mm in depth

3)

No obstruction and painting to sprinkler heads

4)

Correct sprinkler heads used in correct locations

Pipe Support

5)

Pipe work properly supported

Wall/Floor Penetration

6)

Proper wall / floor penetration

Pipe & Pipe Support

Wall/Floor Penetration No Visible Damage

2

Sprinkler Location & Installation

No Visible Damage

Effective date: 1st Dec 2014

57

Appendix 3

Item*

3

Standards

Fire Alarm Location & Installation

1)

Location of fire alarm panel, break glass & bell is correct

2)

Location & spacing of detectors are correct

3)

Fire alarm wiring in conduit (GI type)

Paints

4)

Panel and conduit properly painted

Fire Alarm Zoning Diagram

5)

Fire Alarm Zoning diagram provided near panels / subpanels

1)

Location of hosereel as per approved shop drawings

2)

Hosereel cabinet properly labelled

3)

Hosereel pipe properly fixed with hangers & brackets

3)

Hosereel operation instruction properly marked on hosereel drum or door

4)

Correct & proper painting for hosereel

No Visible Damage

4

Hosereel Location & Installation

Paints No Visible Damage

* An item is deemed to have failed if any one of the standards is not met

Effective date: 1st Dec 2014

58

Appendix 3 Part 4: Quality Standards for Plumbing & Sanitary Works

Standards

Item* 1

Concealed Pipes Location & Installation

Alignment

1)

Pipes properly supported, bent without distortion, kink and damage

2)

Pipe and fitting ends properly capped

3)

Proper joints

4)

Materials used are of approved types

5)

Vertically or horizontally aligned

1)

Location of pipes installed and labelled as per approved shop drawing

2)

Pipes properly supported, bent without distortion, kink and damage

3)

Joints are watertight

4)

Pipe & fitting ends properly capped

5)

No potable water pipes below non-potable water pipes

6)

Materials used are of approved types

7)

Horizontally and vertically aligned and parallel to building surface

8)

Inclined pipes laid to proper gradients

9)

Plumb < 3mm per 1m height

10)

Do not cause obstruction / pose safety hazard at public area

11)

Sufficient clearance between installed pipes / ceiling and pipes / wall for accessibility

12)

Service pipe duct accessible

No Visible Damage

2

Exposed Pipes Location & Installation

Alignment

Clearance

No Visible Damage

Effective date: 1st Dec 2014

59

Appendix 3 Item* 3

Water Tank Location & Installation

4

Standards

1)

Location, type & capacity as per approved shop drawing and specification

2)

All openings properly covered and secured

3)

Joints & pipe connections are watertight.

4)

Not located below non-potable water pipes

5)

Corrosion-resistant external cat ladders provided for large water tank

Netting

6)

Netting properly fitted for overflow / warning / vent pipes

Clearance

7)

Accessible for maintenance. Minimum clearance of 600mm all rounded the water tank

No Visible Damage

8)

No visible damage

9)

Clean & free from debris

1)

Location & type as per approved shop drawing

2)

No noticeable vibration & noise from pump / motor

3)

Test certificate for alignment of Pump & Motor from manufacturer

4)

No bad / loose electrical terminations

Pump & Motor Location & Installation

Electrical Termination No Visible Damage

* An item is deemed to have failed if any one of the standards is not met

Effective date: 1st Dec 2014

60

Appendix 3 Part 5: Quality Standards for Basic M&E Fittings

Standards

Item* 1

General Requirements

2

Plumbing & Sanitary Fittings

2a

Gully & Floor Trap

2b

2c

Pipes

Fittings

Effective date: 1st Dec 2014

1)

Joints & Gap • No visible gap • Consistent joint width & neat

2)

Alignment & Evenness • Aligned, leveled and straight

3)

Material & Damages • No visible damage / defects • No stain marks • Securely fixed • Consistent colour tone

4)

Functionality • Functional and safe

5)

Accessories Defects • No missing accessories • No visible damage / defects

1)

No damage or chokage

2)

Must be securely fixed

3)

Trap's top lower than the surrounding floor level

1)

Visually aligned horizontally, vertically and parallel to building surface

2)

Inclined pipes laid to proper gradients

3)

No leakage at joints

4)

Plumb < 10mm / storey height

5)

Brackets firmly secured & adequately spaced

6)

If painted, no drippings & with good opacity

1)

Firmly secured & joints properly sealed & pointed

2)

No leakage at joints

61

Appendix 3 Item*

3

M&E Fittings

3a

Installation

Standards 3)

No chipping or cracks

4)

No paint drops or mortar droppings

5)

Fittings in working condition

6)

Accessible for maintenance

7)

Do not cause obstruction / pose as safety hazard (e.g. sprinkler head to point inward).

8)

No sediments / particles found in water collected at terminal water fittings (remove aerator & showerhead).

9)

All sensor covers properly sealed against water seepage

10)

Materials used are of approved types

e.g. power point, telephone point, air-con diffuser, fan coil unit, lighting, smoke alarm, sprinkler heads, CCTV camera, etc. 1)

Fittings must be aligned and location as per approved drawings.

2)

No stains

3)

Neat patch-up for pointing / penetration

3b

Safety

1)

No exposed wiring within reach

3c

Damages

1)

No visible damage

* An item is deemed to have failed if any one of the standards is not met

Effective date: 1st Dec 2014

62

Appendix 4

Defects Grouping Guide for Assessment of Internal Finishes Element

Defects Grouping

Defects Description

Floor Wall

Finishing Alignment & Evenness Crack & Damages

Stains, Painting / Coating Defects, Tonality, Patchy & Roughness Alignment, Unevenness, Squareness Crack, Chipping, Dent, Scratches

Hollowness / Delamination Jointing

Joints, Pointing

Ceiling

Door Window Component M&E Fittings

Effective date: 1st Dec 2014

Finishing Alignment & Evenness

Stains, Painting / Coating Defects, Patchy

Crack & Damages Roughness Jointing

Crack, Chipping, Dent, Scratches

Joints & Gap Alignment & Evenness Material & Damages Functionality Accessories Defects

Joints, Pointing Joints, Gap etc too big, Inconsistent, Improper Seal Crack, Chipping, Dent, Scratches, Defects, Finishing, Tonality Movement, Functionality, cannot be opened or closed properly, Loose Missing items, Improper Fixing, Stains, Corrosion, Other damages

63

Appendix 5

BUILDING GROUPING GUIDE CAT A

CAT B

CAT C

CAT D

Commercial, Industrial,

Private Housing,

Public Housing

Landed Housing

Institution & others

Commercial, Institution, Industrial & others

In General : All types

In General : All types

of building that has a

of building without

Semi-Detached

central cooling system

central cooling system

Terrace House

HDB Public Housing

Bungalow

Cluster Housing e.g.

e.g.

Bank

Condominium

Office Building

Apartments

Shopping Complex

School

Hotel

Factory

Supermarket

Warehouse

Airport Hospital

Mixed Development

University

without Central Cooling

Regional Library Conference Hall Arts and Cultural Centre

Mixed Development with Central Cooling Note: The above is only meant to be a general guide in determining the Category of project. The actual grouping might vary depending on the project details in the application. For instance, a mixed development building project, ie, one with commercial and residential components in the development, where the residential GFA > 50% of the total GFA, is categorized as category B (housing).

Effective date: 1st Dec 2014

64