2026-09-15
Weight, thermal performance, speed of installation and cost — a practical comparison.
For decades, Australian walls have been built from clay bricks and dense concrete blocks. AAC (autoclaved aerated concrete) — the white, precision-cut block used across Europe, China and the Middle East — changes three things that matter to builders: weight, thermal performance and build speed.
An AAC block at B05 density weighs about 525 kg per cubic metre. A standard dense concrete block is closer to 2,000 kg/m³. On a multi-storey project that reduces foundation loads, craneage and structural steel. It also means a single mason can lay far more blocks in a day without fatigue.
Thermally, the story is stronger. AAC at B04 grade has a dry thermal conductivity around 0.09–0.11 W/(m·K), versus 1.5 W/(m·K) or worse for normal concrete. A 200 mm AAC wall behaves like a 400 mm concrete wall in steady-state heat transfer — and because the material is vapour-permeable, it handles Australian humid summers without trapping condensation.
The trade-offs are real. AAC is softer than concrete, so fixings need nylon anchors rather than steel screws. It also needs compatible thin-bed mortar or adhesive, not site-mixed sand-and-cement. But when specified correctly, it delivers the three things Australian developers want: lighter structure, compliant thermal performance and faster enclosure.
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