Help aqua board has been skimmed

[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

 

[mikethetile]

Kens right

im concerned about gypsum still being present on the surface of the aquaboard as well as tanking aquaboard

if you want to tank it why not just rip it out and use ordinary plasterboard

 

[JVC600]

thanks for the replies .

i took a wall paper stripper to the boards last night .
the plaster just fell off afer about 10 seconds worth of steaming

have spoke to kanuf technical and bal reference tanking them .

they said as long as i can get the plaster off they should be fine .

as a safe guard a light sand with 180 grit should get the key grip back after washing them off with water .

as for taking them off they cost over £75.00 to replace so dont think i want to to do that .

tanking them will make them totaly water proof , so hence use the bal primer them the tanking kit .

i think this will do the job ??