I have just replastered a wall in a basement. The wall is in a space that will later become a laundry room. For this wall, I was planning to mount cabinets and have a countertop. Above this countertop, I was planning to put some tiles.
Now I'm wondering if you can tile directly on the plaster (Weber plaster mortar C)? Is there special tile adhesive for this type of plaster? Or is it enough to prime and then use "regular" tile adhesive?
Now I'm wondering if you can tile directly on the plaster (Weber plaster mortar C)? Is there special tile adhesive for this type of plaster? Or is it enough to prime and then use "regular" tile adhesive?
Well, I was thinking more about if there is a specific tile adhesive intended specifically for this type of plaster?
You shouldn't mix harder and softer plaster, for example. My thought was whether the same applies to tile adhesive on plaster?
You shouldn't mix harder and softer plaster, for example. My thought was whether the same applies to tile adhesive on plaster?
It's just a matter of priming (it's important to bind the dust and ensure that the plaster doesn't draw out water from the adhesive) and then proceed with regular tile adhesive. The fact that the tile adhesive is harder doesn't matter since it's such a thin layer, compare it to tiling directly on a regular gypsum board which is considerably softer than plaster and yet it works well.
I had the same concern, called Maxit (Weber) who directly advised against also applying fix on C-mortar, as it is so hard. The builder thought it was nonsense "that's what we always do." And it has indeed held up 
In the basement, we basically tiled on lime mortar, and it has held up exceptionally well since '55. So take the supplier's instructions etc with a grain of salt sometimes.
/A
In the basement, we basically tiled on lime mortar, and it has held up exceptionally well since '55. So take the supplier's instructions etc with a grain of salt sometimes.
/A
Yep, I always take the manufacturer's instructions with a grain of salt!
I did the same when I plastered the walls:
The bag said "Flush immediately with plenty of water if in contact with skin."
But I reasoned like this:
- Eh... How dangerous can it be? It's just plaster, not concentrated hydrochloric acid.
and then I slapped on the plaster (without gloves, of course).
After a few hours, my fingers started to sting a lot, and I noticed that the skin had quite a few small acid burns.
Anyway... I'm tiling!
I did the same when I plastered the walls:
The bag said "Flush immediately with plenty of water if in contact with skin."
But I reasoned like this:
- Eh... How dangerous can it be? It's just plaster, not concentrated hydrochloric acid.
and then I slapped on the plaster (without gloves, of course).
After a few hours, my fingers started to sting a lot, and I noticed that the skin had quite a few small acid burns.
Anyway... I'm tiling!
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Too bad the thread ends before we find out the decision you made after all the responses. Did you use primer, and if so, which one? Which adhesive did you choose?eviljava said:Yep, I always take the manufacturer's instructions with a grain of salt!
I did the same when I plastered the walls:
The bag said "Rinse immediately with plenty of water if it contacts skin".
But I reasoned like this:
- Ahh... How dangerous can it be? It's just plaster, not concentrated hydrochloric acid.
and then I smeared on the plaster (without gloves, of course).
After a few hours, it started to sting quite a bit on my fingers, and I noticed that the skin had quite a few small acid burns.
Anyway... I'm tiling!
This was two and a half years ago. I actually don't remember exactly which primer and tile adhesive I bought.
But I seem to recall that I procured the materials at Bauhaus. Most likely, Kiilto products were used (if that matters?).
But I seem to recall that I procured the materials at Bauhaus. Most likely, Kiilto products were used (if that matters?).