Brick houses in central and eastern Europe are usually build with clay block bricks like Porotherm with λ = 0,1 - 0,133 W/mK. There are also some with 0,082 W/

Brick houses in central and eastern Europe are usually build with clay block bricks like Porotherm with λ = 0,1 - 0,133 W/mK. There are also some with 0,082 W/mK but usual combination is brick+insulation (i.e.: to have wall with U value less then 0,22 W/(m²⋅K) you can use brick with thickness of 38cm and 10cm insulation. For 20cm concrete wall you would have to use 30cm insulation.)