Repairing Bathroom plaster before tiling

[jeanette63]

Hi
I applied acrylic pva to dry, have put second coat on, how long will I need to leave the plaster before tiling. Im using light tiles 200x100.
Thanks
Jeanette

 

[PrenticeBoyofDerry]

It would depend on whether the room is warm and the depth of the plaster, ideally 6 weeks but people very rarely wait that long.

 

[jeanette63]

Wow,thats much longer than I thought. The plaster is mostly a skim of 5-10mm, a few deeper patches and its a warm room. I was hoping 7-10 days would do

 

[PrenticeBoyofDerry]

I am assuming as the depth of plaster is quite deep, that this was a skim coat on top of a basecoat. These do tend to take some time to dry out. As stated previously the guidelines are normally 6 weeks in dry conditions for a complete drying period. This period is very rarely required or even complied to, each wall and situation will have an affect on this drying period. Usually in these situation the plaster is best inspected for drying, normally the plaster will start to go a deep purple, then to light pink, when the light pink colour is achieved you can be confident that the plaster is suitable to be worked on/over. Do remember prior to tiling to prime the walls (read the manufactures instruction of the tile adhesive you are to use, as they will inform you of what is required) but generally one coat to dry, then a second coat until tacky. If any of the walls are to be painted apply two applications of mist coat (water down emulsion/20% water with a quality paint).

 

[London Mike 49]

As said above, but read this and just be aware if the manufacturer of the adhesive states no primer then abide by their advice.
//www.diynot.com/diy/posts/1662126/

Mike

 

[jeanette63]

Thanks for all your help and advice guys
Life was less complicated when I tiled the bathroom previously I didn't know about pva, they did stay up 20yrs til I took them down, maybe luck! Was some job getting them off though.
I have bought Mapei Mapegrip Plus, its water based does that mean I shouldn't use the pva again before tiling (its Bostick cementone adhesive/primer/admixer &sealer), plaster isn't as deep as I thought and is drying rapidly, my tiles are 200x100 brick tiles. Im tiling half height except taller in the shower corner.
So much conflicting advice everywhere on using pva its confusing

Thankyou in advance
Jeanette

 

[chappers]

The general consensus is not to use PVA, but how times change, not so many moons ago, no-one primed anything. Not so long ago I removed some tiles from a kitchen that I reckon had been there since the 70's and they were all still stuck fine. Then came the PVA era where everything was PVA'd.
I rightly or wrongly PVA'd before tiling my bathroom, nearly 20 years ago, some of it onto plain old plasterboard and I have just started taking them off and they are still stuck like 5h1t to a blanket .
Now we live in the era of specialist primers and if you use anything else your house is going to fall down.

Who knows?