Tiling onto painted plasterboard drywall

[b30 villain]

Hi people ive got a kitchen splashback to do in the monster in laws and on inspection the walls are painted plasterboard. What in your opinion is the best way to tackle this ie priming etc thanks in advance

 

[united]

I would sand down and use acrylic primer before tiling

Some of the more experienced members might offer better advice?

 

[Gazzer]

try and remove as much paint as possible, score the paint. Assuming you are using cement based addy then an acrylic primer. Tubbed addy no primer neccessary unles adhesive maker calls for it.

 

[Dan]

Make sure you score the plasterboard along with sanding it. Scoring it diagonally every 100mm or so to create diamond patterns in the plasterboard will help give the adhesive a good key. Then sand the walls down with a course sandpaper (doesn't have to be all gone, just most of it, and scored and sanded to shreds) then prime with a good primer. Don't use PVA!

 

[b30 villain]

cheers fellas i had a little sand of it and i think the board has soaked the paint up pretty good so might just score it and prime it

 

[b30 villain]

wont use pva ever again after reading previous posts

 

[CJ CERAMICS]

the paint needs to be removed as above
prime the area with an acrylic primer as stated.
basically as united has stated.

 

[united]

You might find this handy to score the walls Scoring Tool

 

[b30 villain]

cheers fellas im doing it as a freebie for the experience but have to go there once a week so dont want to balls it. id never live it down:lol:

 

[kickkick]

Dose scoring into the the surface not weaken the plaster bond?

I have always just keyed the surface up with some 40 or 30 grade aluminum oxide break down the paint and key the surface up, Dust off then prime and then tile.

 

[brian c]

Dose scoring into the the surface not weaken the plaster bond?

I have always just keyed the surface up with some 40 or 30 grade aluminum oxide break down the paint and key the surface up, Dust off then prime and then tile.

you are only supposed to score the paint not the plasterboard.

 

[Aston]

as above

really good sanding down, mechanical key needed and chemical primer/bonding agent too

best of luck

 

[tfs]

I abrade the surface before scoring the surface just to reduce the chance of any dust etc filling the holes you have just scored and then prime the surface. If the area has previously been tiled it may also be worth considering cutting out and replacing the existing plasterboard.