Tiling onto Painted Walls ???

[derekdickinson]

Hi guys, just been asked, well told, by customer to tile directly onto a painted wall, it's never been plastered its just drylined/ any advice on preparation. PVA, keying etc.. he is in a hurry for the wall to be done which I cant get to anyhow until Friday, but he's insisting it doesnt need any prep, think he's more worried about the bill !:huh2:

 

[doug boardley]

definitely NOT PVA!! it should be ok as it is

 

[derekdickinson]

Hi Dave and Thanks for reply, new to this, can you give me a bit more detail why you wouldn't use pva? cheers. :8:

 

[doug boardley]

Hi Dave and Thanks for reply, new to this, can you give me a bit more detail why you wouldn't use pva? cheers. :8:

Dave will explain, but believe me if you have pva in your van,give it to a joiner!!

 

[doug boardley]

Hi Dave and Thanks for reply, new to this, can you give me a bit more detail why you wouldn't use pva? cheers. :8:

ettringite failure, google it derek!

 

[White Room]

Or a plasterer

 

[BDS]

Or plasterer

 

[White Room]

Snap:lol:

 

[BDS]

Great minds think alike mate :lol::lol::lol::lol::lol:

 

[DHTiling]

PVA just forms a skin over the wall substrate and then when you put your adhesive on to it , it becomes live again and goes tacky...thus effectively decoupling your tiling....you need to use an impregnating primer..( i.e acrylic or synthetic)...these primers impregnate the substrate and make them stable for tiling when using cement based adhesive( as mentioned ettringite failure) and if using a dispersion adhesive then they stop the water suck from the substrate causing less open times...