2026-10-05
From Docklands apartments to Mornington retail, ALC panels are replacing block-and-render on fast-track commercial shells.
Melbourne commercial construction runs on speed. The NABERS rating pushes every facade toward better thermal performance, and the standard spec for an infill wall used to be concrete block, render and a separate insulation cavity. Over the last two years, a growing share of that work has moved to reinforced ALC panels, and the reasons are mechanical, not fashionable.
An ALC panel is autoclaved aerated concrete with steel mesh cast in, cut to a specified length — typically 600 mm wide, 100–200 mm thick, up to 6 m long. On a Melbourne job it is crane-lifted or forklift-placed directly onto the structural frame. There is no block laying, no wet render waiting to dry, no separate insulation trade. A three-storey Docklands infill that would take eight weeks with block-and-render gets enclosed in about three with panels. That is a concrete saving on a commercial program where every week of facade costs holding costs and financing.
Thermally, the panels carry the same story as AAC blocks: B04 grade sits around 0.10 W/(m·K) dry, so a 150 mm panel on a steel frame hits an R-value near 1.4–1.5 without add-on insulation. NABERS and the NCC 2022 energy provisions are now tight enough that dropping that extra insulation layer — and the cavity that came with it — simplifies the whole wall build-up. Builders in Southbank and Fishermans Bend are specifying 150 mm panels precisely for this reason.
Seismic and fire follow. A1 non-combustible panels satisfy the NCC fire-resistance requirements for most commercial partitions. The embedded steel mesh makes them behave as ductile infill in a quake, which is why they are accepted in taller podium structures where unreinforced block would need extra engineering. Panels arrive in Melbourne through Port of Melbourne, about 18–20 days from Ningbo, and a 40ft container carries roughly 55–65 m² of 150 mm panel — enough to enclose a floor of a mid-rise podium. For a builder who has watched render cracks and insulation fall-off on the old system, the switch is easy to justify.
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