2026-09-22
How foam-concrete + XPS sandwich blocks combine structure and insulation in one leaf.
Traditional Australian cavity walls separate structure (brick outer leaf) from insulation (blanket or batts in the cavity) from weatherboard render. A composite self-insulating block does the whole job in a single 240 mm leaf: structural foam-concrete body on both sides, flame-retardant XPS core in the middle.
The numbers matter. The blocks carry a 700 kg/m³ bulk density, MU5.0 compressive strength, and a heat-transfer coefficient K around 0.35 W/(m²·K) — which is what Chinese designers call meeting the national 75% energy-saving standard in one masonry leaf. Fire rating is A1: inorganic foam concrete outside, flame-retardant XPS inside.
Two practical benefits often surprise Australian builders. First, because the body is cement-based, it bonds directly with normal mortar — no interface agent, no compatibility worries. Second, you can nail and use expansion bolts into it, unlike pure AAC which needs plastic anchors.
The real saving is on site. Skip the external insulation subcontractor, skip the render scratch coat, skip the cavity trade. Chinese contractors report roughly 30% faster wall completion. For projects where cost per square metre of envelope matters as much as thermal performance, this is the product to spec.
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