Aluminum Storefront Windows: Singapore Systems & Glazing Guide

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Aluminum Storefront Windows: What Should Singapore Projects Specify?

An aluminum storefront window is a non-load-bearing aluminum-framed glazing system commonly used in retail frontages, entrances, lobbies and commercial openings.

The appeal is straightforward: large glass areas, relatively narrow framing and efficient installation.

But Singapore’s hot, humid climate and frequent heavy rainfall make the specification more demanding than simply selecting an aluminum profile. The complete system needs to address framing, glazing, drainage, thermal performance, structural loading, safety and finish.

For aluminium alloy windows, the current SS 212:2007 Singapore Standard covers materials, construction, finishes, hardware and performance. A 2026 revision is currently listed as a draft, so project teams should confirm the contractually applicable edition before specification.

The practical rule: specify the complete storefront system and its documented performance—not just the aluminum profile.

Quick Specification Summary

What Is an Aluminum Storefront System?

A storefront system is typically a relatively shallow aluminum-framed glazing assembly installed within a defined building opening.

Typical components include:

• Head
• Jambs
• Sill
• Intermediate mullions
• Glazing beads
• Gaskets
• Anchors
• Drainage channels

The system transfers its own weight and environmental loads through the framing and anchors back to the surrounding structure.

For commercial projects, the design objective is usually:

maximum glazing area + controlled loads + reliable drainage + compliant glazing.

 

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Storefront vs Curtain Wall: Which System Fits?

This decision should be made before the window package is priced.

For Singapore curtain-wall projects, SS 654:2020+A1:2023 is the current curtain-wall standard, covering design, installation and performance. The standard includes requirements related to air permeability, watertightness and structural performance.

A storefront should not be substituted for a curtain wall simply because both use aluminum and glass.

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The Three Storefront Problems Worth Solving First

Water at the Sill

For a Singapore storefront, water management deserves early attention.

Review:

A storefront that relies entirely on sealant instead of positive drainage is a weak specification.

Safety Glazing

Commercial storefronts are often located directly beside pedestrian traffic.

Singapore’s SS 653:2020 Code of Practice for Glazing in Buildings – Safety Related to Human Impact addresses vertical glazing in locations exposed to accidental human impact. Its purpose is to reduce cutting and piercing injuries caused by glass breakage.

Depending on the location and design, the glazing may require:

• Toughened glass
• Laminated glass
• Insulated glazing
• Other safety-glazing configurations

The exact selection should be confirmed against the project’s glazing schedule and applicable requirements.

Thermal Performance

In air-conditioned commercial buildings, frame and glazing performance should be evaluated together.

Consider:

• Thermal-break design
• Low-E glazing
• SHGC
• Window-to-wall ratio
• Solar shading
• Whole-envelope energy performance

BCA’s current Approved Document states that windows on the building envelope must meet the air-leakage rates specified in SS 212.

The correct approach is not simply:

“Use a thermal break.”

It is:

Set the project’s performance target first, then select the frame and glazing configuration that meets it.

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How to Specify the Storefront Frame

The extrusion should be evaluated as part of a complete system.

The required profile depends on:

span + glass weight + wind load + support conditions + allowable deflection

A heavier-looking extrusion is not automatically a better storefront.

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Storefront Glazing: What Should You Specify?

Avoid specifications such as simply “Low-E glass.”

The quotation should identify:

• Glass thickness
• Coating
• Cavity
• Gas fill
• Spacer
• Lamination where applicable

This is necessary because glass configuration can materially change the final thermal and structural performance.

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What Should the Supplier’s Documentation Include?

For Singapore aluminium window projects, SS 212 is the central reference for materials, construction, finishes, hardware and performance. BCA also identifies SS 212 as the acceptable solution for aluminium alloy window safety requirements.

For curtain walls, SS 654:2020+A1:2023 covers the wider façade system and associated components such as brackets and anchors.

Request:

• Section drawings
• Glazing schedule
• Structural calculations
• Drainage details
• Safety-glazing documentation
• Finish specification
• Test/compliance documents
• Installation details

The most important procurement question is:

Does the documentation describe the same configuration that will actually be installed?

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Singapore Storefront Procurement Decision Table

This is the practical framework to use before ordering.

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When Should You Choose Storefront Instead of Curtain Wall?

Choose storefront when the glazing remains within defined openings and its framing can safely transfer loads to the surrounding structure.

Choose curtain wall when the glazing becomes part of a continuous multi-storey façade.

Storefront is generally appropriate for:

• Retail fronts
• Commercial entrances
• Small lobbies
• Defined single-floor openings

Curtain wall is more appropriate when the project requires:

• Floor-to-floor glazing
• Continuous elevations
• Complex façade drainage
• Multi-storey anchoring
• Higher façade engineering

The choice should be made during design, not after selecting the lowest quotation.

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How to Compare Storefront Window Quotes

Put each supplier into the same technical schedule:

A lower quotation may simply exclude higher-performance glazing, additional testing, better finishes or engineering documentation.

Compare the specification first. Compare the price second.

For more accurate quotations, use our guide on what drawings and information to send to an aluminum window manufacturer.

Frequently Asked Questions

What is an aluminum storefront window?

An aluminum storefront window is a non-load-bearing aluminum-framed glazing system commonly used in commercial openings such as retail fronts, offices, lobbies and entrances.

What is the difference between storefront and curtain wall?

Storefront is generally used within defined openings, while curtain wall is an engineered façade system that can span multiple floors and transfer loads through anchors and the main structure. Singapore’s current curtain-wall standard is SS 654:2020+A1:2023.

What standard applies to aluminum windows in Singapore?

SS 212:2007 is currently listed as the Singapore Standard for aluminium alloy windows. A 2026 revision is currently listed as a draft, so project teams should confirm the applicable edition before procurement.

Is safety glazing required for commercial storefronts?

Where glazing is exposed to accidental human impact, the applicable requirements should be checked against SS 653:2020, which addresses safety related to human impact.

Does a Singapore storefront need a thermal break?

Not every storefront configuration requires the same frame construction. For air-conditioned commercial buildings, however, the frame and glazing should be evaluated as part of the overall thermal strategy.

Why do storefront windows leak at the sill?

The common problem is inadequate drainage. Properly designed sill channels, weeps, gaskets and perimeter interfaces should provide a controlled path for water to exit the system.

Can storefront and curtain wall use the same aluminum profiles?

Not necessarily. Their structural, drainage, anchoring and façade requirements are different. They should be specified as complete systems for their intended application.

Bottom Line

A good aluminum storefront window is not simply a slim aluminum frame with large glass.

For Singapore projects, evaluate the complete system around:

SS 212 + safety glazing + drainage + thermal performance + structural design + finish + installation.

Use storefront where the opening and load path suit it. Use curtain wall when the façade becomes multi-storey or requires a continuous engineered envelope.

Before comparing prices, compare the technical specification and supporting documentation. That is the fastest way to distinguish a commercial-grade storefront system from a product that only looks suitable on a quotation sheet.

Request a Singapore Storefront Specification Review

Send Starveil:

• Opening dimensions
• Elevation drawings
• Project location
• Glazing requirements
• Design information
• Thermal requirements

Request a Commercial Storefront Window Review →