Help! Conflicting advice.

[michellek]

We are going to be fitting a new bathroom with bath, no shower and have put up plaster board all the way round.
We got a plasterer in for a quote to plaster just the ceiling, but he says we will need to get all the walls plastered too, and then PVA before tiling. We are planning on tiling two walls on the bath wall, and painting the other two. But, after reading various different forums and advice pages, some say you don’t need to plaster as it could come off with the tiles. We want to put up 30 x 60 porcelain tiles around and above the bath to the ceiling, I also read not to use PVA.
Any advice would be welcome as he is coming next week to plaster the whole bathroom.

 

[PrenticeBoyofDerry]

You can tile straight on to plasterboards, the truth is un-plastered plasterboards, carry more tile weight, than plastered plasterboard!
Page 6 covers this:
http://www.bal-adhesives.co.uk/newpdfs/literature/Sitework_Guide_DL_2013AW_LR.pdf

 

[michellek]

Thanks for your reply, that is very handy information . He has said its because the plaster board is only 9mm and that the tiles could peel the paper away from the board, or the board flex when you lean against the tile to get out of the bath, could this happen? We are so confused.

 

[tpt]

previous poster is right. Never use pva with modern adhesives it should be acrylic or SBA and absolutely no need to plaster them first.

Just get the two walls you are painting plastered, or better yet fully tile it!

plastering wont help with flexing boards (which is a non issue anyway), and the paper is actually stronger then the skim thats on top - thats why plasterboards have a higher max weight than plaster.

 

[michellek]

Brilliant, thanks for your advice. Is there anything we need to do to the plaster board before tiling as a barrier to stop water ingress if the grout should fail over time?

 

[tpt]

ideally you should tank it - the easiest types are painted on before you tile. This is far more important in a shower area, but can be well worth it for the first 18" above the bath.

if you havent fitted your bath yet, silicone the bath to the wall, then tank down to it, tile, then run a very small bead of silicone between bath and tile.

a good trick is to fill the bath before you silicone, so its at its lowest point

 

[michellek]

Brilliant, thanks for all your advice

 

[joe-90]

9mm is no use. You need 12.5 and Aquapanel in the wet areas.