The most popular thickness is 25 cm.

Two-, three-layer walls and partitions

To create two -layer walls, such material as porous ceramics is used. The most popular thickness is 25 cm. If the choice fell on a hollow brick, its density should be 1400 kg/m in this case, in order to obtain the heat transfer resistance 3.40 m² • K/W, you will need a 10-centimeter layer of insulation. For comparison: a wall with a thickness of 35 cm from cellular concrete will have an indicator R = 3.83 m² • K/WT.