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Ask The Trades › DIY Forum › Plumbing Questions › What material do i put under shower tray?

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What material do i put under shower tray? (Read 7509 times)

Ian_Reynolds

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What material do i put under shower tray?
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???

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HM Super Member Offline Chief Turd Polisher Posts: 5072 Total Thanks: 0 For This Post: 0 Gender:	Re: What material do i put under shower tray? Reply #1 - Feb 24^th, 2005, 7:58pm 12mm marine ply? I use 18mm as I thought that was the minimum. HM
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bstyle GDPR opt-out Total Thanks: 0 For This Post: 0	Re: What material do i put under shower tray? Reply #2 - 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
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Ian_Reynolds GDPR opt-out Total Thanks: 0 For This Post: 0	Re: What material do i put under shower tray? Reply #3 - 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.
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Chaddy GDPR opt-out Total Thanks: 0 For This Post: 0	Re: What material do i put under shower tray? Reply #4 - 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 ) 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.
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