I have removed tiles in the kitchen, and several cm deep plaster clumps came off behind each tile over a larger area. So, it must be built up again to get a nice new tile setting against the rest of the kitchen. What I haven't understood after some searching at building supply stores and online is what type of plaster or mortar I should use? The only thing that explicitly claims to be good under tiles is house fix, but it is an expensive solution as I see it since it requires building up several cm in some places. What else can I use?
The wall is a brick wall built in '46 with some kind of plaster that feels very sandy to the touch now.
The wall is a brick wall built in '46 with some kind of plaster that feels very sandy to the touch now.
Whitish and very sandy sounds like lime plaster? It should probably be a plaster that allows a lot of "movement," perhaps C-plaster or even "looser," (d, e-plaster/mortar?). This given that you can now use cement-based lime plaster to patch up.
One thing is for sure, you probably shouldn't use adhesive to fill the holes, as you said, very expensive.
I would probably repair it with something like C-mortar (1 part masonry cement, 7 parts masonry sand), after making sure that you can mix cement-based lime plaster into the current wall.
Take a small piece of the plaster to the hardware store and ask what type of plaster it is and what you should use?
One thing is for sure, you probably shouldn't use adhesive to fill the holes, as you said, very expensive.
I would probably repair it with something like C-mortar (1 part masonry cement, 7 parts masonry sand), after making sure that you can mix cement-based lime plaster into the current wall.
Take a small piece of the plaster to the hardware store and ask what type of plaster it is and what you should use?