Bathroom Wall Prep And Adhesive Advice.

[Cabnero]

Hi Guys. I've got to tile my Mums bathroom later in July for which you have already answered some questions. I've just got a couple of quickies re the prep if you dont mind.

The walls are half tiled which will be coming off so no worries there. Above the tiles however, there is a painted , I think render, which has a bobbly finish, not smooth. In the main the paint seems pretty sound but I was going to scrape the walls to flatten them as much as poss. This should loose hopefully miost of the paint. I was goint to use 12.5 mm Marmox in the shower area and 12.5mm plasterboard for the rest. My questions are:

Does the wall need priming before I fix the Marmox board, and indeed the PB.
Will Dot and Dab be sufficient for the plasterboard or is it best to use screws also? If so do I need to use washers as well for the plaster boards? BTW the tiles are 600 x 300 porcelain.

I usually use Bal addy but Ive been looking and Ardex X7 seems more reasonable. Is this ok to use. Presumably its best to keep the same manufacturers for the primer and addy?

Many thanks for your assistance and any additional comments.

 

[White Room]

The screws go through the adhesive locations, the adhesive should be applied with dabs and evenly on the wall then fix the board.

 

[Cabnero]

Thanks whitebeam.

 

[Cabnero]

thanks for the answers guys one thing I forgot to ask is do you use normal plasterboard tape for the plasterboard joints then cover with the tile adhesive.

 

[Flintstone]

No need to tape the joints on plasterboard unless your plastering them

 

[Cabnero]

Cheers local tiler