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Buildable Design Appraisal System

Basics Of Buildable Design

The 3S Principles of Buildable Design

Standardisation - repetition of grids, sizes of components and connection details

Simplicity - uncomplicated building construction systems and installation details

Single integrated elements - those that combine related components together into a single element that may be prefabricated in the factory and installed on site.

The Buildable Design Appraisal System

The Buildable Design Appraisal System (BDAS) was developed as a means to measure the potential impact of a building design on the usage of labour. The appraisal system results in a buildable design score of the design based on the 3 components of the formula:

Buildable Design Score Formula

Buildable Design Score (BDScore) of Building =

BDScore of Structural System
+
BDScore of Wall System
+
BDScore of Other Buildable Design Features

Please refer to the Code of Practice for details on computation of buildable design score.

The Guide to the Buildable Design Appraisal System (for COP on Buildable Design, September 2005 Issue) is also available for download here.

Constructability Appraisal System

The Constructability Appraisal System

The Constructability Appraisal System (CAS) was developed as a means to measure the potential impact of downstream construction methods and technologies on the productivity at site. The CAS results in a ‘Constructability Score’ of the building works.

The Constructability Score is expressed as: 

Constructability Score of Building Works =

Constructability Score of Structural System
+ Constructability Score of AMEP* System
+ Constructability Score of Good Industry Practices

*AMEP refers to Architectural, Mechanical Electrical and Plumbing

Please refer to the Code of Practice on Buildability, April 2011 issue for details on computation of Constructability Score.

The submission form for Constructability Score can be downloaded here. Submission of the Constructability Score is via Corenet ESS.

For more information on the Industry Briefing on Enhanced Buildability Framework which includes the Constructability Score E-submission Guide, please refer to here.

Constructability Points for System Formwork

System formwork are classified into vertical formwork and horizontal formwork under the Structural Component of the Constructability Appraisal System (CAS). There are 5 bands assigned to both vertical formwork and horizontal formwork. Each band is allocated different points to reflect the relative efficiencies of different system formwork.

The banding of any system formwork is based on productivity assessment outcome. Productivity assessments are conducted by formwork system suppliers or builders and witnessed by BCA.

Disclaimer: The banding of system formwork is for the purpose of allocating Constructability points to the different system formwork based only on assessment of their productivity outcome. They do not represent any form of endorsement, approval or accreditation by BCA for their purchase, lease or use. BCA will update the banding information from time to time when more system formwork have been assessed. BCA reserves the right to raise the productivity assessment standards of system formwork and the corresponding bands upon review and may downgrade any system formwork from its given band if the quality of concrete finish arising from its use is poor.

The following table lists the system formwork which have been assessed and their allocated bands and associated Constructability points:

A. Vertical Formwork
No Category Constructability Points Supplier or Builder / System Formwork
a Band 1 15
  • Dragages B96 Steel Column/Wall Formwork
b Band 2 14
  • China Construction-Baili 120 Column/Wall Formwork
  • Doka Framax Column/Wall Formwork
  • Doka Frami Column/Wall Formwork
  • Doka Top 50 Column/Wall Formwork
  • eHub Panex Column/Wall Formwork
  • E-Form Formwork System for Columns/Walls
  • Formwork Hire Steel Column/Wall Formwork
  • HKL-Formaply or SGB Aluma* EasySet Aluminium Column/Wall Formwork
  • HKL-Formaply or SGB Aluma* EasySet Aluminium Formwork (Integrated Small-panelled)
  • HS-CM Steel Column/Wall Formwork
  • JH g+ Column/Wall Formwork
  • MFE Aluminium Formwork with standard 600mm width slab panels, 2725mm/2975mm height wall panels (Integrated Small-panelled)
  • Nakano 1975 Steel Column/Wall Formwork
  • NuForm Aluminium Formwork (Integrated Small-panelled)
  • NuForm Column/Wall Formwork
  • Peri Liwa Wall Formwork + Lico Column Formwork
  • Peri Maximo Wall Formwork + Lico Column Formwork
  • Peri Trio Wall Formwork + Lico Column Formwork
  • Peri Vario Wall Formwork + Lico Column Formwork
  • Peri Vario Wall Formwork + Vario Column Formwork
  • RMD Kwikform Superslim Soldier Column/Wall Formwork
  • Sayamatrix Technology Aluminium Formwork (Integrated Small-panelled)
  • Sim Lian Steel Column/Wall Formwork
  • TAC Aluminium Formwork (Integrated Small-panelled)
  • Woh Hup Sateco Steel Column/Wall Formwork
  • Zulin Steel Form for Columns and Walls
c Band 3 13
  • Asiaric Aluminium Formwork (Integrated Small-panelled)
  • Lubeca Column/Wall Formwork
  • OKH Column/Wall Formwork
d Band 4 11
  • DFS Kumkang Aluminium Formwork (Integrated Small-panelled)
  • DFS Large Area Column/Shear Wall Formwork
  • Fuvi EH Shear Wall+Honey MDC plastic moulded formwork system (Integrated Small-panelled)
  • MFE Aluminium Formwork with standard 450mm width slab panels, standard 2100mm height wall panels plus make-up pieces for top panels (Integrated Small-panelled)
e Band 5 8
  • Millennium Wall & Column Formwork System
  • Zulin H20 Timber Beam Formwork for Columns and Walls

 

B. Horizontal Formwork
No Category Constructability Points Supplier or Builder / System Formwork
a Band 1 15
  • -
b Band 2 14
  • DFS Aluminium Truss Table Forms
  • DFS D2 Table Forms
  • Doka Dokaflex 124 Slab Formwork
  • Doka Dokamatic Table Forms
  • ehub AIRODEK + PROP TABLE Slab/Beam Soffit System Formwork
  • HKL-Formaply or SGB Aluma* EasySet Aluminium Formwork (Integrated Small-panelled)
  • MFE Aluminium Formwork with standard 600mm width slab panels, 2725mm/2975mm height wall panels (Integrated Small-panelled)
  • Nakano 1975 Steel Truss Table Forms
  • NuForm Aluminium Formwork (Integrated Small-panelled)
  • NuForm Aluminium Truss Table Forms
  • Peri Gridflex + Peri Up beam support
  • Peri PD8 Table Forms + ST100 Stacking Towers as beam support
  • Peri Skydeck + Peri Up beam support
  • Sayamatrix Technology Aluminium Formwork (Integrated Small-panelled)
  • SGB Aluma (formerly Harsco Infrastructure) Table Forms on Lightshores
  • Sim Lian B-60 Table Formwork
  • TAC Aluminium Formwork (Integrated Small-panelled)
  • Utracon HD Table Forms
c Band 3 13
  • Asiaric Aluminium Formwork (Integrated Small-panelled)
  • HKL-Formaply or SGB Aluma* Alumalite Table Forms
  • Zulin Table Forms
d Band 4 11
  • DFS Kumkang Aluminium Formwork (Integrated Small-panelled)
  • Fuvi EH Shear Wall+Honey MDC plastic moulded formwork system (Integrated Small-panelled)
  • Huatraco C60 Table Forms
  • MFE Aluminium Formwork with standard 450mm width slab panels, standard 2100mm height wall panels plus make-up pieces for top panels (Integrated Small-panelled)
  • NuForm NF7K Table Forms
  • SGB Aluma (formerly Harsco Infrastructure) Table Forms on Cuplok
e Band 5 8
  • Formwork Hire Table Forms
  • JH g+ Table Forms
  • Millennium StarTable Formwork System

*Due to merger of Aluma and Harsco, the Aluma range of system formwork distributed by HKL-Formaply comes under SGB Aluma Singapore with effect from 1 July 2014.

Note: The productivity bands of the following system formwork have been temporarily suspended pending the outcome of their re-assessments:

S/No. Type of Formwork Supplier or Builder / System Formwork
1 Vertical Formwork
  • Ulma Orma Modular Column/Wall Formwork
2 Horizontal Formwork
  • Ulma CC-4 Panel System+Enkoflex

Suppliers/builders may request for re-assessment of their listed system formwork within 1 year from the date of the first assessment. BCA will publish the better of the 2 productivity outcomes.

In the event that a particular system formwork has not been assessed on its productivity, the system formwork shall be taken to have the same productivity as system formwork classified under Band 5 and be awarded with the lowest Constructability Points.