For thermal insulation of floors on the ground, special mineral wool boards, the so-called. until it is in contact with the ground. This term in practice means, that thanks to a special protection, the boards do not absorb moisture from the substrate, and thus do not lose their thermal insulation properties. When using these boards, it is not necessary to make special waterproofing under the boards, characterized by high resistance and durability. Simple waterproofing, e.g.. made of roofing felt over the thermal insulation.