Plaster Board or Gypsum

amen

Evening,

Attic conversion. Partion walls up.
Have partiona walls up for bathroom.

Not sure to use 2inch plasterboard or Gypsum boards.

There will be tiles going on around the shower. No where else

Any ideas?

If I did go with gypsum (aporx 3/4") how to ensure that the surfaces are level?

Thanks in advance

Mellor

You lost me at plaster board or gypsum?

AckwelFoley

OP. Gypsum is a brand name.. it can refer to really anything..


Gypsum make many many products

If the walls are partitioned, you need to put up plasterboard, which comes in different types.

You can then skim it.. or simply tape and joint them..

Im kinda lost like Mellor is at the moment, your post is not very clear.

Im a long time selling it.. ive never heard of 2" plasterboard!!

bauderline

To state the obvious you should use plenty of marine ply around the shower area... other than that I guess you use ordinary plasterboard (circa 12mm ?) and just skim it... simple as that no ?

baud.

btw - as for checking that the walls are level I would assume it is as simple as using a spirit level.... but I am open to correction,,,

galwaytt

Actually, stay away from plywood as backing for tiling alone. It will shrink and move, eventually, and your tiles with crack of lift. Plasterboard over it is only marginally better.

Use Hardibacker 500 boards. This is a cement based board, specifically for tiling, which won't shrink etc. It comes in (iirc....) 1200 x 800 boards, 12.5mm thick. I've just done our ensuite floor in it as well. I put the hardibacker board over 19mm ply.
You can also remove, and re-tile over it, without fubar-ing the board, which is a downside to plasterboard. Remember, plasterboard isn't waterproof - only the paper (green one) is water......resistant. Not to a bathful of water it isn't !!:eek:

I think the sheet are about........Eur16/each, but they're a job for life. You should be able to get them in any good builder's providers.

bauderline

galwaytt,

noted... and thanks... I will be using that in my build instead of ply....

baud.

Mellor

galwaytt wrote: »

Remember, plasterboard isn't waterproof - only the paper (green one) is water......resistant. Not to a bathful of water it isn't !!:eek:

AFAIK This isn't true. The paper is just indicative, the moisture repellant is added to the core, just fire retardant is in the core of the red board.

product spec wrote:

Gypsum plasterboard with water repellent additives in
the core, encased in a special green paper liner. Suitable
as a base for ceramic tiling in wet use areas. Also used
for external soffits in sheltered positions.

mickdw

I would go for marine ply in shower and green plasterboard in remainder of bathroom. This is widely specified by architects etc. The ply is fine for tiling in my experience as long as a flexible adhesive is used to fix the tiles. Its really up to yourself then if you want to skim the remainder of the room or jst do the joints

Spread

Yes, marine ply or cementboard behind the shower. But these should at least have a tanking scrim at the joints. Moisture resistant plasterboard skimmed elsewhere.