Correct way to fix backerboard

[Johnking]

Hi,

I plan to refurbish a shower, which will entail stripping the tiles from a solid wall. I intend to use a suitable backer board which will need to be fixed to the wall then tanked. There will be a gap of about 30mm from the wall to the edge of the shower tray. What is the right way to mount the board? Should I use wooden battens, and if so at what intervals.

Many thanks,

John

 

[cjard]

Are you looking to use the battens to spacer off the wall so that the 30mm gap goes to nothing? It's going to be a right faff if you're looking to keep the 30mm. I'd buy a bigger tray and cut it down, or chisel the wall out, or buy a cut-to-size wet room tray?

 

[Johnking]

Yes exactly, I need to bring the panel 30mm away from the brick wall. I don't really want to get into a new tray. The fitting of the battens doesn't seem too faffy, I would screw through them into the wall, but maybe I would need a membrane, and / or something to fill the gap behind the panel to reduce condensation?

 

[cjard]

Forget stripping the tiles, just sub their thickness off the batten, whack a 25mm one on, for example. Consider marmox/wedi style boards.. They're an insulating foam covered both sides with a cementitious material. Best price I found for them was on eBay I think, about a tenner a metre. Company was called Nass boards. Glue n screw battens to wall, and boards to battens. If you can leave the space behind the boards ventilated to somewhere it would be ideal