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Tiling on waterproof plasterboard

 
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fredmila
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Joined: 11 Feb 2008
Posts: 39
Location: ENGLAND
PostPosted: Thu May 29, 2008 7:09 pm    Post subject: Tiling on waterproof plasterboard Add User to Ignore List Reply with quote
One thing that is bugging me: if I am using waterproof plasterboard (Knauf) in bathrooms, presumably I do not need to Tank it and could(?) apply the tile adhesive straight onto it. But how can the paper support the tiles? If I stick a piece of masking tape on it and pull it, it will pull the paper easily.
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ultimatehandyman
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Joined: 16 Jul 2005
Posts: 9769
Location: Darwen, Lancashire
PostPosted: Thu May 29, 2008 7:43 pm    Post subject: Add User to Ignore List Reply with quote
If it is being used in a shower area, then it would be best to tank it first.

The paper supports the tiles because it is all bonded together, if you use a piece of masking tape it does not cover a large surface area, like a wall full of tiles would do.

You can see the weights that certain substrates can support here-


Wall tiling

Correctly braced aquapanel can supporg 50kg per square meter Wink
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mstar
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Joined: 27 May 2008
Posts: 94
PostPosted: Mon Jun 02, 2008 8:27 am    Post subject: Add User to Ignore List Reply with quote
i saw my builder tiling on waterproof plyboard is that normal (obviously he put PVA first) is that ok for the bathroom? (it is a partition wall)
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ultimatehandyman
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Joined: 16 Jul 2005
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Location: Darwen, Lancashire
PostPosted: Mon Jun 02, 2008 4:47 pm    Post subject: Add User to Ignore List Reply with quote
He should not of used the PVA, unless it was external PVA. Chances are it will be ok, unless the area gets really wet-

http://www.ultimatehandyman.co.uk/tiling/diy_Tiling_Why_not_to_use_pva.htm
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