Aluminium Window CONQUAS Guide

Singapore's Good Industry Practices – Aluminium Window is a Building and Construction Authority (BCA) guide in the CONQUAS Enhancement Series. BCA describes it as a practical reference for achieving good-quality fabrication and site installation, using photographs and diagrams to explain common defects, their causes and preventive measures (BCA Aluminium Window guide, accessed 2 September 2026).

What the guide is for

The guide is aimed at designers, contractors, fabricators and site supervisors involved in aluminium window work. Its central quality idea is that window performance depends on a chain of decisions: design detailing, compatible materials, controlled factory fabrication, careful transport and storage, site installation, inspection and testing. A defect discovered at handover may therefore originate in design or fabrication rather than only in the final installation (BCA Aluminium Window guide, accessed 2 September 2026).

Design, fabrication and installation controls

The guide highlights practical controls such as providing suitable drainage paths, ventilation and internal air seals; detailing window heads and other exposed interfaces; selecting compatible frame, gasket, sealant and accessory materials; and fabricating and assembling components accurately. Factory work can improve repeatability, but site teams still need to protect frames and gaskets from physical damage, install units to the intended tolerances and coordinate the window with the surrounding wall and waterproofing details (BCA Aluminium Window guide, accessed 2 September 2026).

Common defects and field checks

The guide's defect-and-remedy section links water seepage through a frame to issues such as poor fabrication or installation, poor top-frame detailing, incompatible gaskets and damaged components. Its preventive measures include reviewing drainage and shielding design, using suitable gasket profiles, protecting the frame and gasket, and carrying out a field watertightness test. These examples illustrate a diagnostic method: identify the observed failure, trace plausible design/material/workmanship causes, then verify the corrective detail rather than applying a generic sealant fix (BCA Aluminium Window guide, accessed 2 September 2026).

Relationship to current window-safety requirements

This workmanship guide should not be confused with BCA's current regulatory window-safety requirements. BCA separately states that window works must comply with the objectives and performance requirements of SS212 as set out in the Building Control Regulations, and that prescribed completion certificates apply to completed window works (BCA Windows safety, accessed 2 September 2026). The CONQUAS guide itself says it illustrates good practices adopted by practitioners and contractors; it is not intended to dictate how every aluminium window must be designed or installed. Project specifications, applicable standards, statutory requirements and professional advice remain controlling.