What thickness aluminum window for Australia?
Extrusion wall mm, frame depth, and glass—how to spec aluminium windows for wind, AS2047, and AS 1288 without guessing.
What Thickness Aluminum Window for Australia?
“How thick should the aluminium be?” sounds like a one-number answer—until you get three different replies: 1.4 mm wall, 70 mm frame depth, and 6.38 mm laminated glass. In Australia, the right spec isn’t a meme from overseas forums; it’s what keeps your largest opening inside AS/NZS 2047 performance and AS 1288 glass rules for your site.
Three “thicknesses” people mix up
Before you compare quotes, split the question:
Term | What it usually means | Why it matters in AU |
|---|---|---|
Extrusion wall thickness | Metal wall of the aluminium profile (e.g. ~1.2–2.0 mm class) | Stiffness, deflection, feel; must suit span and wind rating |
Frame depth / system depth | Overall profile height (e.g. ~60–100+ mm residential systems) | Glass pocket, thermal break room, drainage, stiffening |
Glass thickness | Pane or laminate makeup (e.g. 4 mm, 5 mm, IGU combinations) | Safety per AS 1288, acoustic, weight on hinges |
What this means for you: A “thick” frame with thin glass can still fail compliance or safety. Ask suppliers for wall thickness, system name, glass makeup, and AS2047 scope together.
Does Australia mandate one aluminium wall thickness?
There isn’t a single national “all windows must be X mm aluminium” line that replaces engineering. Compliance paths run through:
AS/NZS 2047 — whole-window performance for declared sizes and wind actions
AS/NZS 1170.2 — wind actions used in design (your exposure matters)
AS 1288 — glass type and thickness for the application
A 1.4 mm wall might be fine on a small awning window but inadequate on a wide slider in a cyclonic or high-wind region unless the section is deeper, ribbed, or reinforced. Thickness is a means; certified performance is the proof.
Typical aluminium wall thickness bands (illustrative)
Use these as conversation starters with your supplier—not as code. Actual projects need the manufacturer’s compliance table.
Application | Common extrusion wall thickness (indicative) | Notes |
|---|---|---|
Light residential, small sashes | ~1.2–1.4 mm | Often non-thermal economy lines; verify span limits |
Main residential, thermal-break systems | ~1.4–1.6 mm (sometimes higher on mullions) | Popular upgrade path; check largest slider size |
Large openings, coastal wind | ~1.6–2.0 mm+ or engineered reinforcements | May need deeper system, not wall alone |
Commercial / high-rise | Engineered per project | Often custom sections; don’t extrapolate from house quotes |
Illustrative only—confirm with test reports for your exact size and wind level.
Frame depth: when “bigger” helps more than thicker metal
Deeper thermal-break systems (often in the ~70–90 mm class for residential—names vary by brand) give:
Room for wider thermal breaks and better glazing pockets
Stiffer sections for double glazing
Better water drainage channels
A shallow, heavy-wall profile isn’t automatically better than a well-designed deeper system that’s already 2047-listed for your opening.
Glass thickness in Australia (don’t guess)
Glass is chosen from AS 1288 based on area, height, human-impact risk, balustrade rules, etc.—not from a generic “5 mm everywhere” rule.
Need | Direction |
|---|---|
Larger panes | Thicker, laminated, or IGU per glass schedule |
Safety / low level | Often laminated where impact risk applies |
Acoustic / security | Laminate thickness drives weight—check hinge and sash limits |
Double glazing | Two panes + cavity—total unit weight affects rollers |
Your window quote should state glass makeup (e.g. 6.38 mm laminate / 4+12+4 IGU), not only “double glazed.”
Frame, glass, hardware, installation—how thickness ties together
Aluminium frame
Confirm nominal wall thickness on frame and sash—they can differ.
Ask maximum rated width × height for your wind region on that thickness/system.
Glass
Match AS 1288 schedule; oversized “thin” glass is a safety and deflection risk.
Heavy glass demands roller and hinge ratings—hardware is part of thickness logic.
Hardware
Cheap rollers on thick, heavy sashes fail early—especially coastal dust and salt.
Installation
Packing, fixings, and wind loading don’t add mm to the extrusion but can void performance if the unit is twisted in the opening.
Scenario guide: what to specify
Your project | Practical thickness conversation |
|---|---|
Standard suburban reno, modest windows | ~1.4–1.6 mm thermal-break class + sized IGU; get 2047 chart for biggest window |
Full-height sliding door | Deepest listed system for span; often thicker walls or steel reinforcing inside |
Beachfront, high wind | Prioritise certified pressure level; bump hardware to marine; wall mm alone isn’t enough |
Bushfire zone (BAL) | Glass and screen requirements may dominate; frame must suit approved system |
Import containers / “export grade” | Overseas mm labels may not map to AU test data—require local 2047 evidence |
Budget rental, small awning | Thinner economy sections may exist—accept smaller max sizes and lower wind ratings |
Myth vs fact
Myth: “Thicker aluminium always means AS2047 compliant in Australia.”
Fact: Compliance is per tested system and size. A thicker wall on an uncertified or oversized opening doesn’t replace a 2047 report; sometimes a deeper engineered profile beats brute mm.
FAQ
What thickness aluminum window for Australia?
Clarify extrusion wall mm, system depth, and glass makeup. Many residential thermal-break lines sit around ~1.4–1.6 mm walls with deeper profiles, but your largest opening and wind zone dictate the legal product choice via AS/NZS 2047.
Is 1.2 mm aluminum too thin for Australian homes?
It can be appropriate for small, low-load windows in approved systems. It’s a weak default for large sliders or high-wind coasts without a specific compliance chart—ask for written limits.
Is 2 mm aluminum necessary on the coast?
Coast needs corrosion-rated finishes and marine hardware first. Extra wall thickness helps some spans but doesn’t replace salt maintenance or 2047 water resistance.
How thick should double-glazing be?
Follow AS 1288 and the window maker’s IGU spec for each pane and overall unit weight—not a single mm for all rooms.
Do thicker frames improve energy efficiency?
Thermal break design and glass matter more than raw mm. Depth helps fit better glazing; wall thickness alone doesn’t guarantee better WERS.
Can I use Chinese profile thickness labels on an Australian job?
Only if the same system has acceptable AS/NZS 2047 documentation here. Never assume overseas “2.0 mm premium” maps to local cert without paperwork.
Bottom line
For Australia, ask: “What is the certified maximum size and wind level for this system—and what are the frame wall, system depth, and glass makeups?” ~1.4–1.6 mm walls on quality residential thermal-break systems are common, but coast, height, and opening width push you toward deeper systems, reinforcement, and heavier glass—proved by 2047, not by thickness bragging alone.
Pre-purchase checklist
Get written wall thickness (frame + sash) and maximum compliant dimensions for your wind exposure.
Lock glass schedule to AS 1288 and the supplier’s IGU spec.
Match rollers/hinges to sash weight; coastal = marine hardware regardless of mm.