Use of plasterboard in bathroom

ukthesis123

I am looking to remove my old iron caste bath and replace it with a new shower unit. Plus have some tiling in the bathroom done as well. A low quote I received involved the workman inserting plasterbaord over the existing tiles, rather than removing them. This might be one reason his quote was low. But, in non-technical terms, is there anything wrong with this method? What puzzles me is why doesn't everyone do it this way if its so cheap and effective?

ormus

mainly because modern rooms are so small. you dont really want to loose another inch or two off the walls.
if the PB is only halfway up the wall, then there will be a "step" in the tiling.

DVardysShadow

Sounds dire. How do you fix plasterboard to glazed tiles? And if you succeed at that, and then tile, the plasterboard is sandwiched between tiles. If water gets in, there is nowhere for it to go out. I would rule that quote out, I think

ukthesis123

He wants to "stick" the plasterboard all the way to the ceiling on the walls. He does say he's used this before fine, and if it's really bad, clearly he would have had some comeback by now. That said, I understand what you say but there again, if this method is so bad, I don't see his being in business long.

[Deleted User]

We had new tiles in the bathroom of our previous house, and when the original tiles were taken off we found that the plasterboard underneath was damp and needed replacing. Personally I wouldn't be comfortable putting another layer of plasterboard over the existing tiles for reasons of compounding any future problems.

ukthesis123

Also, isn't there a type of plasterboard for damp conditions like bathrooms?

Canucklehead

ukthesis123 wrote: »

Also, isn't there a type of plasterboard for damp conditions like bathrooms?

Good evening: Aquapanel.

HTH

Canucklehead

sheslookinhot

You can get moisture resistant plasterboard, it has a green paper rather than the standard grey.

Personally, I would recommend removing the tiles, removing the plasterboard, fitting moisture resistant plasterboard where there will be a water from a shower spraying onto walls, and finally "tanking " the area with a waterproof kit, prior to tiling.

andyhop

Remove tiles and plasterboard, New board then tank with Homelux tanking membrane

Aquapanel is not needed, Plasterboard and tanking will last far longer and will work out cheaper

Plasterboard could be applied over the tiles with the use of Gyproc Bond-It primer then dri-wall adhesive, But you will loose 20mm of your room per side

ukthesis123

So the upshot is that the use of plasterboard over existing tiles isn't a good idea, and that I should go the route of removing the old tiles from the walls?

frank.hopper

YES! too much that could go wrong=

The existing tiles might not be fixed 100% to the walls

The plasterboard adhesive could fail if the tiles are not cleaned and keyed

Whack them off-and do it properly.