Skimming plasterboard in a bathroom

[gavos]

I've just built a stud wall to extend my bathroom. I've used green water-resistent plasterboard but what type of plaster should I use to skim the boards? Once plastered, some areas will be tiled and some painted.

Many thanks for any advice you can give.

 

[Richard C]

Green moisture resistant is fine for general bathroom areas but for wet areas (behind baths & in shower cubicles), I would advise either tank it or use a tile backer board. Use Multi Finish or Board Finish for the skim coat.

Where have you extended the bathroom to? If you’ve nicked a bit of the adjacent bedroom, Building Regulations require that stud walls between a room containing a W/C & another habitable room must be sound insulated!

 

[gavos]

I've nicked some space from the bedroom to extend the bathroom but I've used sound-bloc boards on the bedroom side and insulated the void.

The green MR board is going to be along the side of the bath (which will have an overhead shower). I was hoping that after I've skimmed the wall and tiled it, it'll be OK. Is this foolish? I don't want the tiles to start falling off in a couple of months!

Being a bit of a newbie, I'm not familiar with tile backer boards or DIY tanking. How would I go about this?

Thanks for the advice.

 

[Richard C]

I've nicked some space from the bedroom to extend the bathroom but I've used sound-bloc boards on the bedroom side and insulated the void.

I got caught out by this last year & as I’d already used ordinary wall board on the bedroom side, I had to double up on them to meet spec; no big deal but inconvenient. To meet the BR’s, you need to use high density board BOTH sides & insulate the void!

The green MR board is going to be along the side of the bath (which will have an overhead shower). I was hoping that after I've skimmed the wall and tiled it, it'll be OK. Is this foolish? I don't want the tiles to start falling off in a couple of months! Being a bit of a newbie, I'm not familiar with tile backer boards or DIY tanking. How would I go about this?

Personally I wouldn’t use any sort of plasterboard in wet areas unless it’s tanked;
http://www.ultimatehandyman.co.uk/building_a_shower.htm

but I only ever use cement based tile backer board;
http://www.tilefixdirect.com/catego...ds-main.html?gclid=CIL75o6vtZYCFQHilAodNU_HFA

Unless it's being fully tiled, I also always skim PB in the rest of the room even the bits that will be tiled afterwards; but don’t skim the backer board. For the small additional work/cost involved it really isn’t worth the risk. Cement tile backer boards are also high density so there is an advantage on stud walls in that they meet the sound insulations regs.

 

[gavos]

Hmm, looks like I've got a bit more work to do.

That's for the advice, that's a great help!

 

[Richard C]

Hmm, looks like I've got a bit more work to

Just to add; if you do go for tile backer board & it’s the stud wall between the bathroom & bedroom, make sure you use 12.5mm or the density won’t comply with the sound insulation requirements!