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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> What material do i put under shower tray? https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1109241087 Message started by Ian_Reynolds on Feb 24^th, 2005, 10:31am

Title: What material do i put under shower tray?
Post by Ian_Reynolds on Feb 24^th, 2005, 10:31am

Normally I'd buy some 12mm marine ply, but in B&Q last night the salesman claims they only have WBP board or 15mm cement board. I told him I'd swerve on the WBP board, but he claimed that this cement board is made for putting under shower trays ...despite it saying on the board that it's a tile board....

Out of idle curiosity, is this cement board any good, and could it be used under a 800x800 quadrant stone resin shower tray in place of Marine Ply???

Title: Re: What material do i put under shower tray?
Post by HM on Feb 24^th, 2005, 7:58pm

12mm marine ply? I use 18mm as I thought that was the minimum.

HM

Title: Re: What material do i put under shower tray?
Post by bstyle on Feb 24^th, 2005, 9:46pm

Are we talking about 12mm ply on top of bare joists?

If so its far too small, as HM says minimum 18mm but if the floor is getting tiled I would always put in 25mm

Title: Re: What material do i put under shower tray?
Post by Ian_Reynolds on Feb 25^th, 2005, 10:02am

Hmmm, sorry about that, it was a typo error. It's actually 22mm I use not 12mm. Mind you it didn't stop me measuring some spare I have last night just out of curiosity.

Title: Re: What material do i put under shower tray?
Post by Chaddy on Feb 25^th, 2005, 9:38pm

I wouldn't use cement board to bed a shower base on it's just not strong enough.
To all intents and purposes its only cement(surprised :o) with a mesh in the surface layer.
As the other guys said minimum of 18mm ply is required.

It's fine for tiling though fixes and cuts just like plasterboard.