Tiling on painted walls and row plasterboard.

[Anthony30]

Hi all.

I was wondering if anyone can help me. I am about to tile the bathroom walls floor to ceiling. The walls are plasterboarded and have been painted with a bathroom grade paint.

Also I have cut out and re-boarded part of the wall so some areas are just plasterboard. This is where the concealed shower mixer is going above the bath

My Questions are:

Can I put waterproof tile adhesive straight onto the walls or do I need to prime it.

I have done a test with duct tape to ensure the paint isn't going to flake off and it appears to be ok.

Can anyone suggest anything or tell me it is ok just to tile straight onto the wall.

Thanks

Ant

 

[gcol]

Give the painted areas a rub down with sandpaper to key the surface. Around the shower I'd tank the walls. You won't need to prime the painted areas, but for the bare plasterboard you should see if your adhesive manufacturer recommends using a primer and if so use that. If the bare plasterboard is around the shower you should seriously consider tanking it.

 

[Anthony30]

Thanks, Gcol.

What do you mean tanking?

 

[gcol]

You can get tanking kits. It's like a waterproof barrier that you paint on.
http://www.trades-direct.co.uk/modules/shop/view.asp?Prodcode=9005-102

 

[Anthony30]

Cheers Gcol.

I will do just that. A fair bit of money but i suppose it needs to be done.

Cheers

Ant

 

[gcol]

It's not essential that you tank but it is advisable.

 

[Anthony30]

Hi.

reference this waterproofing. I have never seen it done on new builds where there has been a shower installed and looking at the shoddy work people have done in our barratt house I wouldn't be suprised if they haven't done it in the shower cubical.

I am using waterproof adhesive throughout the bathroom so will this along with primer potect the plasterboard enough?

Cheers

Ant

 

[gcol]

No they won't do it on new builds cause it takes time and costs money. If you're unsure, tanking is more of an issue with smaller tiles.
The waterproof adhesive that you mention refers only to the fact that it will not degrade when wet and not that it will repel water (the same goes for the grout too). The primer isn't a water proof barrier either - that's just to ensure a good bond between adhesive and wall.
The final choice is down to you, but total piece of mind will cost £60.

 

[Anthony30]

Thanks for your help, the tiles are quite big so we are going to take a chance.

 

[Moz]

can I just add ...as well as shower area ,
I would do/tank around bath if its a pasterboard wall