2026-09-25
Density, strength, nail-holding and moisture — how the two lightweight blocks compare.
Both AAC and ceramsite foam concrete blocks are lightweight masonry. They are not interchangeable. The difference is in how they are made: AAC is autoclaved, fine-pored, near-white; ceramsite blocks are cast around expanded clay aggregate with a foam matrix, greyer, tougher, and a bit heavier.
Strength and density tell the first story. AAC runs B03–B06 (325–625 kg/m³, 1.0–5.0 MPa). Ceramsite blocks run 600–900 density grades (550–950 kg/m³, MU2.5–MU7.5). In practice ceramsite is 20–30% heavier and harder-wearing — but its thermal conductivity (0.12–0.20 W/(m·K)) is slightly higher than premium AAC.
Where ceramsite wins: fixing. You can nail, screw and expansion-bolt into a ceramsite block the way you would into normal concrete. You cannot do that into AAC without plastic wall plugs. For rental kitchens, hospital mounting points and commercial fit-outs this matters.
Where AAC wins: thermal. B04 AAC at 0.09 W/(m·K) beats most ceramsite grades. For external envelope in a cold climate, AAC is the more efficient wall. For interior party walls, wet areas or commercial walls where fixtures matter, ceramsite is often the better call. Many projects specify both — AAC on external walls, ceramsite on internal high-use walls.
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