Horizontal sealing of the base slab

So this is how it was done here. Concrete slab. On top, bitumen waterproof membrane welded with a gas burner. On top of that, the cables and lines. On top of that, insulation made of a kind of Styrofoam, but significantly more pressure-resistant. On top, a foil, on this the heating coils. Then screed on top. Separated from the walls by a kind of blue foam material. On the screed in the bathrooms, a waterproof coating. In the other rooms, a leveling compound, mapei something is written on the bags. On top of that either tiles or vinyl, with vinyl there is a kind of primer in between. Also mapei. This construction is actually standard here, although the manufacturer of the materials is of course not always the same. Karsten