Tiling onto ply

[outcycling]

Hi guys,

OK, I know you shouldn't tile onto ply if avoided, in bathrooms especially, but..

Got a job to do a small amount of tiling behind the end of a 'free standing' bath and a sink/toilet below window height. The builders/plumber that prepped the area used ply to box the area. I am going to have to build out the bathroom end anyway so could us MR ply there so it is just behind the sink/toilet.

Given it is not actually in a shower area (there is not a shower in the room) would you just tile it and have done or take it all of and MR plasterboard it ?

If you tile the ply then should you use a bal primer or equivalent ?

Cheers.

Russ

 

[Colour Republic]

What thickness ply was it?

Can you not clad in backer boards if you are thinking of changing to WBP ply anyway?

 

[outcycling]

What thickness ply was it?

Can you not clad in backer boards if you are thinking of changing to WBP ply anyway?

Stupidly didn't check thickness tbh. I was going to use 12.5mm MR plasterboard. No need to use anything else as not directly against bath or in a shower area. Wouldn't change to another ply.

 

[Andy Allen]

I would clad it with cement boards, insulation boards or even plaster board if possible....much better surface to tile to.

 

[Colour Republic]

If it's not getting wet then MR plasterboard is fine. If the ply is thin i'd be tempted to remove it and just go straight on with the plsterboard. Or better still a 12.5mm tile backer board.

 

[outcycling]

Cant add more depth to the wall so only option is to remove and replace or leave alone Im afraid.

 

[outcycling]

If it's not getting wet then MR plasterboard is fine. If the ply is thin i'd be tempted to remove it and just go straight on with the plsterboard. Or better still a 12.5mm tile backer board.

OK, so if the ply is 9.5 or bigger you'd just tile it ?

 

[Colour Republic]

nah i'd want it to be at least 15mm. To be honest I just don't like the stuff in a humid environment, but if it's a small area and well fixed then I would take the risk at 15mm plus. 9mm ply, not a chance

 

[outcycling]

nah i'd want it to be at least 15mm. To be honest I just don't like the stuff in a humid environment, but if it's a small area and well fixed then I would take the risk at 15mm plus. 9mm ply, not a chance

OK, thanks a lot for the advice. Will find out depth and deal with accordingly. Cheers.

 

[Rich Midge]

Even if the ply is of sufficient size and you're happy to tile to it you'd be best to take it off and prime the edges and faces you don't see as well as the ones receiving the tiles. You want to stop moisture ingress from every angle.

 

[outcycling]

Thanks Rich. Almost more hassle than its worth. Be easier to just take of and replace with 12.5mm MR PB

 

[Rich Midge]

Thanks Rich. Almost more hassle than its worth. Be easier to just take of and replace with 12.5mm MR PB

Completely agree.

 

[KateJ]

Shouldv'e read this before today. My joiner has just put donw 18mm ply for me to tile onto.... Site was offline at citical moment...!!!

 

[Time's Ran Out]

KateJ - Cover with a decoupling membrane.

 

[jobdone]

Need to stiffen the floor then decouple. Stick the decoupling membrane with ardex af200