DIY Doctor UK DIY Forums

Hi everyone. Complete novice here, would really appreciate any advice you can give. I am looking to retile around my bath, on a tight budget, prior to having an electric shower fitted. The walls are stone (downstairs bathroom in an old cottage) and the tiles will be smallish ceramic. (Either 150 x 75 x 9mm, or 200 x 100 x 7mm). The existing tiles are mosaics on a backing sheet. I have removed a small portion behind the sink. A thin layer of something has come off, adhering to the old adhesive, (a little of which can be seen to the very left of the pic) leaving me with what i think may be the plaster? It is a fairly smooth, very thin, pinkish surface, as in pic (also showing a tiny bit where that too has detached, and there is a rougher surface beneath). Assuming it all comes off like this, can anyone advise please, do i just tile straight onto the exposed plaster(?) surface, or should i treat it in some way first? Many thanks in advance!

Yes, you can tile directly onto plaster but you need to make sure your tiles are not too heavy. Gypsum plaster has a maximum weight tolerance of 20kg/m2. Before you tile remove any damages or flaky plaster and fill. You should also apply a tile primer to the plaster first.