Help re wall preparation - bathroom

becks92

Hi all, could we get some guidance on tiling... Basically we have taken off the non breathable tile effect wallpaper that was up in the bathroom and its uncovered areas of old plaster new plaster and lots of cracks.

Here are our questions:

1) do we have to sugarsoap the walls before tiling?
2) can we tile over plaster that has been put up over wallpaper (yes the classy builder who converted the house, plastered over wallpaper and then wallpapered over the new plaster)
3) do we need to fill the cracks in or do we just fill with them with adhesive when we start tiling( they look like surface cracks where new new plaster has shrank back from corners

Any help at you can give us would be wonderful :-)

NICHOLAS_2

Are they cracks that would crumble if tapped with a hammer?

As long as the plaster doesn't look like it will fall off anytime soon then it would be ok to tile over it.

If you have any largish pot holes then i would fill them with bonding coat.

It all depends what you want to spend really.

If it was me i would be wanting to level the wall to make the tiling easier because most walls aren't straight. You could plaster board the wall and then tile which would be better.

becks92

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becks92

Hi Nicholas, as you can see there is a right missmatch but for the most part its fairly stable but there arent many potholes so to speak - we are only talking a mm or two.

The question about sugarsoap is Iam worried that the residue glue from the wallpaper could react with the tile adhesive - silly I know but just wanted to ask.

Andy_89

I'd have the lot skimmed.

richy999

Take the lot back to the plaster under the wallpaper (under the top layer of skim), then get it skimmed. I would be worried about moisture being trapped by the wallpaper under the plaster.

It's also much easier to tile on a nice new flat surface rather than having to account for any humps/hollows.