by stoneyboy »
Tue Mar 30, 2021 10:26 pm
Hi kjoro
It looks like the wavy black felt is the DPC in the wall, there is also a blue edge of the DPM under the floor. They clearly don’t join so damp will come up the gap. Suggest you use a wet render mix to level off the gap, then once this has set and dried a bit apply a number of coats of bitumen DPM to seal off the gap. It’s not going to be perfect but the alternative would involve relaying the floor.
Regards S