Bathroom wet UFH floor buildup

[Super_Paulie]

On 15/02/2026 at 23:51, Nickfromwales said:

I've never used backer board and only ever 6mm or more of plywood (glued and screwed down) and then tile straight onto the ply.

 

I've bought this from Wickes before I even clicked on I should have got marine ply. 

 

Wickes 6mm ply

 

Will this stuff be ok? I'll be tiling, so priming and flexible adhesive on top of this.

[Nickfromwales]

39 minutes ago, Super_Paulie said:

 

I've bought this from Wickes before I even clicked on I should have got marine ply. 

 

Wickes 6mm ply

 

Will this stuff be ok? I'll be tiling, so priming and flexible adhesive on top of this.

Yup. It'll stick like shit to 2 blankets  I've never bought marine ply as if the water is getting to the plywood, you're already wrapped in both of those blankets!