ᐅ Bitumen waterproofing membrane on the concrete slab

A waterproof membrane can also be placed between the masonry and the foundation slab. Sealing above this layer is not strictly necessary but is usually done as a standard practice.

-XIII- schrieb:

We also used the “black tank” method, and the sequence for us from bottom to top was: 1. a leveling layer, 2. bitumen plus a waterproof membrane, 3. insulation, 4. the concrete slab.

In my opinion, applying it above doesn’t make sense because water would likely rise up the walls if it comes through the slab.

That’s why damp-proof membranes should be installed under the walls. We also used the Katja membrane.