I have had to re-plaster part of my shower room. This is about 25mm thick and was done using browning and then finish plaster. I am assuming that I need this to dry completey before I plaster. Once this is done I should prime the surface.
I have read conflicting advice on this. The tiling faq
However, elsewhere I have read that this can cause problems if it gets wet.
I would be interested to hear the views of the group on this. Thanks Tim
Once plaster completely dry, PVA (5 to 1 or thereabout), and tile. I have done 5 bathrooms and 7 kitchens this way over the last 5 years and haven't had a problem yet.
IME standard tile adhesive sticks perfectly well to new plaster. It's designed that way
You have to check the instructions for the adhesive you use. None are likely to recommend PVA as it's water soluable, which is not a smart move in a shower. You shouldn't need anything on new plaster as the surface will be stable, and the adhesive will contain its own bonding agent anyway. Just check it's suitable for use on plaster (most are nowadays).
I would suggest using a waterproofer/plasticiser in the grout, such as BAL Admix GT1, although this is more important on untanked plasterboard walls.
Except when it's waterproof?
MBQ
,
Waterproof/Exterior PVA (which is really EVA) is only waterproof inside a mortar mix (and it's only a bit more waterproof than PVA). Other than that, I'm not sure what you're referring to.
If you want to create a waterproof barrier (e.g. on plasterboard), use one of the tanking products designed for the purpose. If you just want a bonding agent, that's already in the tile adhesive, and it sticks rock hard to anything (as anyone who's tried to get a misplaced bit off will testify;-).
OTOH I slapped tiles onto fresh plaster within days with no further preparation at all, and they are fine also.
A lot probably depends on the tile cement. I found 'evostik waterproof' which is like 'no more nails' in a tub. Its the best yet.
That's why the tiles and the grout are there. To keep the plaster walls dry.
If ANY water gets to plaster you are in deep doggy-doos.Never mind the PVA.
You shouldn't need anything
,
Thanks, nor was I really, hence it was a question rather than a statement.
MBQ
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.