Thermal insulation properties. Thermal conductivity of autoclave aerated concrete, like any other building material, depends directly on the density. The lower the density, the lower the thermal conductivity and warmer in your house. The D400 gas concrete block has, unlike other wall structural materials, the smallest heat conductivity coefficient is 0.098. For comparison, a full -bodied ceramic brick — 0.8, hollow ceramic brick — 0.65, silicate brick and slag block — 0.9. With such a coefficient of thermal conductivity, a wall of aerated concrete D400 300-375 mm thick. you can not insulate additionally.