shower niche / alcoves

drummer_666

I have started to build the stud frame work to sit around my bath.
I'm putting in a couple of niche / alcoves.

I'm doing my research on how to waterproof the niches.

I have boarded the main wall with moistureboard and am going to use this for the niches too.

Is it ok to paint on liquid waterproof membrane onto the moisture board and will this be sufficient?

Do i need to paint waterproof liquid onto all of the moistureboard?

Also if anyone knows where to get what liquid waterproof membrane that would be great

I will then be tiling ceramic tiles with a waterproof tile cement.

Thank you

keystone

You don't need moisture board if you are going to tank it but you've done it already.

The BAL WP1 kit (there is a Dunlop equivalent) will suit you. Use the tape in the kit to do the joins between boards and over;llap it onto the rim of shower tray etc. Use an acrylic primer (such as APD or Primer G) first on the boards. Two coats of primer, tape and two coats of goo will sort it. Good tiling shop will do for procurement or online if you want. Full instructions in the kit.

No you don't need to do all the way up. Rule of thumb is 1½m above the rim of the shower tray or edge of the bath.

Alternatively you might like to look at Homelux waterproofing membrane (me like).

Cheers

drummer_666

You say I don't need moisture board if I'm going to tank it. I already have the mositureboard up, do I still need to tank it?

It is a bath with a shower one end btw.

I couldn't find the BAL kit anywhere apart from online but I see this which seems to have a good rep, what do you think?

http://www.screwfix.com/p/mapei-shower-waterproofing-kit/78484

Will this be ok to seal the alcoves as well?

You're saying use a different primer first, then the primer that comes with the kit and then the goo? What's the need for the extra primer?

I think the liquid stuff will be easier to apply and cheaper too

fluffpot

make sure that the bottom of the alcove slopes very slightly out to the bath so that any excess water can drain away

keystone

drummer_666 wrote: »

You say I don't need moisture board if I'm going to tank it. I already have the mositureboard up, do I still need to tank it?

I would. Some wouldn't.

I couldn't find the BAL kit anywhere apart from online but I see this which seems to have a good rep, what do you think?

Mapei Kit is fine.

Will this be ok to seal the alcoves as well?

If they are likely to get wet and if you are tiling yes of course.

You're saying use a different primer first, then the primer that comes with the kit and then the goo? What's the need for the extra primer?

No extra. The BAL kit comes with APD primer in it and the Mapei kit will come with the Mapei primer (which is Primer G) in it too. Just mentioned it so it didn't get forgotten.

I think the liquid stuff will be easier to apply and cheaper too

Probably correct.

Cheers

keystone

fluffpot wrote: »

make sure that the bottom of the alcove slopes very slightly out to the bath so that any excess water can drain away

Same for window cills that are near showers. Slope just enough that water runs off but not so much that the shampoo keeps falling off!

Cheers

drummer_666

hi guys, yup thanks already picked up on sloping them by a couple of mm

thank you

tpt

just a quick question to add to keystone answers. When you say moisture board, do you mean moisture resistant plasterboard (usually green) or a 'proper' cement based backer-board?

if its the former, then you really need to tank it, if its the latter then i'd always advise not to. in a really wet area like a shower you should just tape the joints.

Keystone\OP - not being patronising here, we often get confused customers thinking that MR plasterboard is waterproof!

drummer_666

i mean moisture resistant board, the green stuff. picking up the kit and priming tonight. adding the goo stuff tomorrow n fri, couple days [STRIKE]drinking[/STRIKE] chilling and tiling mon... and tues.. and weds.. and following weekend lol

tpt

great - glad your tanking it :-)

keystone

I'd assumed she meant the green stuff. Mind you thats probably because I invariably only use cement board on floors.

Cheers