We have moved into a house built around 1900, but it was renovated in 1976, and then a basement and an extension above the basement were added. Rock was blasted beneath the old house, and part of the basement is under the old house. A slab was cast, and walls were built with siporex (I think that's what it's called, white porous stones) which were then plastered. The basement is 2-3 under ground.
We have now torn away everything that was built on the external walls. There was a sauna, a small bathroom, and a small toilet. Everything was moisture-damaged. The construction was from the outside in: cold asphalt, plaster, siporex, plaster, insulation (50mm fiberglass), plastic, and then gypsum wet-room wallpaper. In the sauna, the gypsum was replaced by a sauna panel.
Everything is now with a dehumidifier to dry everything out. (Found 2 leaks, a drainpipe from the laundry room above that leaked into the sauna wall/floor, and found that a water outlet leaked into the small toilet wall. But the other walls are also damp, so the drainage needs to be redone.
Now we want a sauna and bathroom with a toilet, and the large room we will use as a laundry room. The large room currently has plastered walls and wallpaper (which has come off in large parts, and some paint behind the wallpaper).
How do we arrange the sauna? Can you have the sauna directly against the plastered wall and skip insulation and sauna panel? Or will the system be too slow, and it will never get warm? Should steel studs and spu boards then panel be installed?
Bathroom. How do you handle waterproofing? It feels like you don't want it in the basement. Can you install tile and ceramic directly on the plaster? Is that approved? Then the wall can breathe in all directions.
I've understood that floor heating shouldn't be in the basement, especially in this case where the insulation is inadequate. But you'd still like to have it in the bathroom; otherwise, it might be cold on the feet. Waterproofing in the floor?
Can you paint with a silicate paint in other parts of the bathroom where the shower isn't?
Many questions arise.
As mentioned, the drainage will be redone, and the asphalt will be removed, then ground boards and draining gravel.
Best regards, Calle
