We want to tile on a basement wall that is partially peeling concrete and plaster.
Is it possible to just remove the loose parts and apply adhesive?
Moisture barrier or not?
Boiler room with a new heat pump and water pump will be installed there.
 
Åsa Lund
Knock down anything that is not securely fastened. For tiling to be smooth, the surface should be even. It is best and cheapest to apply new plaster then. Tile adhesive can handle small level differences of a few mm, but not much more. If there is a floor drain in the room, it is considered a wet room and according to regulations, must have a moisture barrier. HOWEVER, we usually do not have a moisture barrier in the basement since there can also be moisture migration from the outside in.
 
How long do you have to wait to tile after plastering?
Someone said several months.
 
Åsa Lund
No, a couple of days is enough if the plaster isn't too thick. Check with the tile company. The wall behind the plaster is completely dry, right, so it helps to absorb the moisture?
 
Ok. Perfect. We haven't measured the moisture. But no known issues other than the old house.
 
I am also going to lay tiles on the floor in the same room.
Is it the same method?
 
Åsa Lund
Yep, but use filler underneath instead of plaster in that case. Plaster is not durable to walk on. Do you have a floor drain in the room?
 
Okay, I was almost with you on that.
Yep.
 
Floor leveling compound, primer, and plaster purchased.
Tools are available.
 
New rules apply for floor drains in wet areas!
 
Okay, where can I read about it?
 
AnneFi
Henri said:
New rules apply for floor drain in wet rooms!
Not as relevant in a basement. Not the same requirements as in wet rooms.
 
I don't know the regulations for floor drains in the basement, but for other wet areas in the home, the rules are stricter. When repairing water damage in my house this summer, a floor drain installed by my insurance company only seven years ago was not sufficient. It was replaced by my current insurance company with an approved floor drain of a newer model. I believe new regulations came into effect this year.
 
Now, I don't really know anything about the rules and terminology.
But the boiler room will not be used as a wet room.
Whether it counts as a wet room because of the floor drain, I don't know.
For example, we will not treat the walls as a wet room.
And if something needs to be done about the floor drain, the entire drain would probably need to be drilled up.
Because everything is very old.
 
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