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Discuss Sealing plasterboard/moisture resistant board in the Tiling Advice | Tile Forum area at TilersForums. USA and UK Tiling Forum

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I once worked with a tiler. Who when tile straight to plasterboard he would seal it as he said if any moisture got behind the tiles the paper could come off the front of the boards obviously effecting the tiles. Is this true? He used to seal it with I'm sure PVA, though I've heard this shouldn't be used. If it needs sealing what is best to use? Thanks
 

judge

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You don't need to seal plasterboard unless it's in wet areas where's then you should be tanking the plasterboard before tile.i personally seal plasterboard in non wet areas all the time (SBR/water -1-4)
 
OP
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Thanks it's for a area that is plasterboarded with moisture resistant board but is having plastic paneling stuck too it. Do I still need to prime?
 

judge

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Thanks it's for a area that is plasterboarded with moisture resistant board but is having plastic paneling stuck too it. Do I still need to prime?
I don't install panelling but if I was going to I would probably give a few coats of 1 SBR/ 4 water on the boards first
 

Kevbos

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You don't need to seal plasterboard unless it's in wet areas where's then you should be tanking the plasterboard before tile.i personally seal plasterboard in non wet areas all the time (SBR/water -1-4)
You shouldn't really tile with most tiles onto plasterboard full stop as it's not strong enough to hold the weight
 

judge

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As long as the pb isn't skimmed it will hold most tiles except for possibly 10mm porc and above or natural stone
 

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