Help aqua board has been skimmed

[mikethetile]

forgot to mention, it would be a good idea to use a tanking kit in the wet areas

 

[JVC600]

would i just simply use the tanking kit over the skimmed plaster boards as well as over the skimmed cement based aqua boards before i get it tiled?

the bath and shower are tray are not fitted yet.

what the best tanking kit to use??:helpsmilie:

 

[diamondtiling]

Hi you need to say what size tiles you are using and the weight of them as that is an important factor right now.

 

[JVC600]

ceramic tiles 30cm by 20cm i think, mrs has seen these in topps tiles the other day

 

[JVC600]

would u advise on using a wall paper steamer on thse aqua boards to remove the skim coat of plaster ?

then use a tanking kit on them ??

i believe the plaster will not stay on the cement boards ?

any ideas ........?

 

[JVC600]

i had a closer look at the skim plaster ON THE AQUA BOARD.
i took a scraper to the boards and the plaster just comes off in large bits.
so it looks like it has confirmed what i believed already.

u can not skim knauf aqua boards , .


am i correct in asuming i just need to tank the boards over with a tanking kit ??

 

[mikethetile]

im pleased you found out before tiling as that would have been disastrous

has all the plaster come off cleanly or is there a residue left

 

[JVC600]

the plaster skim has come off in little pieces ..
very brittle
well i am going to get the rest of the plaster skim off these boards in next few days .

i will then tank over the boards with the bal wp1 kit i think .

that should sort the problem .

i know now gypsuim plaster skim and knauf aqua boards dont go together.

i think to elimante the aqua boards been been originally pva i will wash them off with water then give them a quick light sand with 180 grit sand paper before i tank them .

should be ok then ???

 

[Ken Bruty]

I would still be concerned whether the boards are suitable to tile at all, because pva was used, and it's unlikely to have come off with the plaster, therefore, you still have a skin over the aquapanel which the tiles would be stuck to, and the bond is only as strong as the pva skin. Aquapanel should never be primed either, to be safe I would replace them completely imo Also the dust from aquapanel is harmful, so I wouldn't recommend sanding that either.

 

[White Room]

A dry cement board sucks the moisture out of new plaster and causes it to crack and delaminate