There is a damp patch on an internal wall of the house I’m doing up. The wall is in between a downstairs toilet and the living room. The patch is on both sides of the wall. The floor in the toilet is concrete. Living room floor is timber on joists. There is no DPM under the concrete floor and from what I can tell, the toilet partition is recent. I have broken the floor in the toilet and planning on putting some DPM first and then concrete the floor again. Also there is an underground wall, where the timber and concrete floors join. I’m planning running the DPM over the wall, so damp doesn’t go on the timber floor (the edges do show signs of damp). Would my plan solve the problem? And should I leave a small gap between the timber floor and the new concrete floor I will lay? I have attached pictures from both sides, so I hope it’s easy to see the issue.
