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Discuss Prep on walls masonry, stud, moistureboard and skimmed plaster in the Tiling Advice | Tile Forum area at TilersForums. USA and UK Tiling Forum

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I need help on what prep I need to do.

I have read on the forums here and I seem to be going round in circles. I have a small bathroom which is stripped back to the following.

wall 1 - masonry red brick
wall 2 - masonry red brick
wall 3 - part stud wall with top 1/4 moistureboard attached
wall 4 stud wall - moistureboard attached skimmed over



a) So the bathroom will sit between walls 1,2,3. Here I am going to board out with tile backer board from wickes. I called STS and they said to use dot and dab to fix the board onto the walls and then mechanical fixings into the wall where the dot/dabs are. To use standards S1 https://www.tilersforums.com/forums/tile-adhesive/ to dot dab. But to do the mechanical fixings straight awat and not after the https://www.tilersforums.com/forums/tile-adhesive/ has set.

To prepare the red masonry wall first I need to use a suitable primer? SBR neat or diluted? Or can I use the following from Toolstation - Mapei Plaster Primer


b) For the part stud wall - this will be boarded in the tile backer secured to the stud wall. But what prep do I need to do for the moistureboard?

c) wall 4 - will just have the sink and radiator attached. For some reason the plasterer skimmed over the wall. So its a stud wall with moisturebaord and skimmed. So what prep needs to be done here?

I am using wickes porcelain tiles that weigh 23kg.

I am having a showerbath fitted.

STS advised that the tilebacker board needs a beed of their STS glue on the edges so no need for tape or tanking on top.
 

jleag

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So I have rung around and I think I will be going with the following unless someone advises against it.

Wall 1 - red brick. To prime with SBR 3:1 and leave for 30 mins before dot and dab the foam tile backer board.

Wall 3 - No prep requires can tile directly onto the moistureboard.

Wall 4 - to use Mapei primer G 1:1 - how long do you leave that?

As to Wall 4 which has skimmed plaster - the weight of my tiles is 23 kg m/2 plus grout and https://www.tilersforums.com/forums/tile-adhesive/.

So should I use that as a feature wall and get different but lighter weight tiles?
 

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