damp wall

[fergie]

hello everybody just a question on a job i am about to start.customers tiles are falling off around bath&shower pulled tiles of and wall is wet there has been no tanking system put on before tiling i was going to leave for a week to see if wall will dry out and if so will it be alright to tank and will it be ok if wall is still a bit damp custumer has 2 bathrooms so leaving to dry out is not a problem any advice would be helpful cheers

[brian c]

what is the substrate?plasterboard,plastered walls,wedi ?This will help us to answer your question.

[andersontiling]

why use tanking around the bath??it sounds like the bath and shower hasnt been sealed properly.and the adhesive will be a standard pva based.remove the loose tile and allow the wall to dry,then use a waterproof acryllic based such as whitestar and seal between the tile and bath/shower

[Dave]

why use tanking around the bath??it sounds like the bath and shower hasnt been sealed properly.and the adhesive will be a standard pva based.remove the loose tile and allow the wall to dry,then use a waterproof acryllic based such as whitestar and seal between the tile and bath/shower

Whitestar is water resistant..not waterproof...

And what tile adhesives have pva in them..?...

cheers...

[andersontiling]

Whitestar is water resistant..not waterproof...

And what tile adhesives have pva in them..?...

cheers...

Tile Adhesives

[Dave]

Palace and panabond....say no more........

Some brands of adhesive need to seriously look at the wording on their packaging...

[fergie]

the shower is actually over the bath the wall in question is a stud wall so i take it to be plaster board with skim over the top

[fergie]

also i have never heard of a arcyllic (p.v.a) in adhesive

[brian c]

i would take the stud wall down if its soaking wet and replace with backerboard or plasterboard and tank it,then fix tiles.

[Dave]

the shower is actually over the bath the wall in question is a stud wall so i take it to be plaster board with skim over the top

It really depends on how agressive the damage is to the gypsum in the board..if it has been over wetted then it will be weak even when dry....cut out any damaged area's and replace..then use a tanking membrane such as schluters kerdi or durabase wp this is appplied with a rapid setting cement based adhesive...( prime walls first) and then use a flexible cement adhesive on top....

Application methods can be found here...

kerdi- Schlüter-KERDI - Schlüter-Systems

durabase- wetdecs.co.uk

[marc1106]

im gonna agree wih BrianC, if its Pboard thats wet then even if it drys thoroughly it still would be compramised(structually) that is! so its remove and replace

[cornish_crofter]

i would take the stud wall down if its soaking wet and replace with backerboard or plasterboard and tank it,then fix tiles.

I would agree but I wouldn't have plasterboard as an option around the bath.

Spend a bit of time getting the wall straight and level on the timbers. It will be worth it.

[whitebeam]

If the stud work is wet and you put standard board on the moisture will soak into it and it may deform

[Corky]

I would class myself as a total beginner and in no way qualified to answer the question,but would 12.5mm wpb plywood be ok as a replacement to the wet/removed plasterboard?
Corky

[whitebeam]

Personaly I don't like using ply on walls, If water ingresses in the ply your grout can turn brown from resin in the ply. If you used ply I would tank it

[atec]

i would take the plasterboard down ethier put up new plaster board and tank or preferably replace the plaster board with aqupanal or simular.

[Corky]

Personaly I don't like using ply on walls, If water ingresses in the ply your grout can turn brown from resin in the ply. If you used ply I would tank it

Thanks for the tip Whitebeam.