Sealing plasterboard/moisture resistant board - Tile Advice

[Matt0029]

I once worked with a tiler. Who when tiling 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]

You don't need to seal plasterboard unless it's in wet areas where's then you should be tanking the plasterboard before tiling.i personally seal plasterboard in non wet areas all the time (SBR/water -1-4)

 

[Matt0029]

Sbr?

 

[judge]

You can get this in builders merchants.or buy tile primer.

 

[Matt0029]

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]

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

 

[Matt0029]

Thanks how long after coating does it take to dry before you tiled? In my case paneling?

 

[judge]

In this weather should be dry within an hour

 

[CJ]

If in doubt, prime it out. 🤔

 

[Matt0029]

Just concerned of the paper coming away from the board.

 

[Kevbos]

You don't need to seal plasterboard unless it's in wet areas where's then you should be tanking the plasterboard before tiling.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]

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