Shower Room Tanking Advice Please

[SB4U]

Hi Everyone. I'm currently DIYing my en-suite shower room and could do with some advice re tanking.

The floor is a new sand and cement screeded floor with in-screed UFH and an Impey Aquagrade former as the wetroom style 'tray' which needs a tanking membrane on it. The dimensions of the former are 1050x1350. I will be installing some shower screens though, so it won't be a full wetroom as such so was intending on not tanking the floor far beyond the tray itself.

The walls are plastered blockwork, although where I removed the tiles from the old shower cubicle, and a few other places, the plaster skim came off too leaving just the first coat plaster. The walls are surprisingly level though, apart from one which is all over the place.

I'd originally planned on using Impey Tilesafe tanking on the former and part way up the walls, as that was what was recommended by the Aquagrade supplier but we've since decided on large format tiles (300x600x9) and I think the plastered walls, or indeed the Tilesafe, won't take their weight as they'll be over 20kg/m2. So I thought that maybe it would be a good idea to dot and dab plasterboard to the walls (plus through fixings) and tank that. Tilesafe still wouldn't be suitable but Impey also do a product called Waterguard which has a higher load bearing capcity of 30kg/m2 which would do the trick. Plus, an added advantage to installing plasterboard is that it will hopefully make tiling with the large tiles easier for me as the substrate should be more level.

Alternatively, rather than tanking the walls at all, I could possibly use something like Marmox or Wedi in the shower area and just use a tanking membrane on the floor. But I thought as there'd be enough membrane left over after doing the floor I could save a bit of money by using that on the walls over normal plasterboard. This project has already cost a small fortune (and many months of time too!) just to get it to this stage, although you'd never believe it by looking at it, so it would make a nice change to save a bit of money.

Or alternatively I could tank the walls with WP1 and use a cheaper membrane on the floor, like Homelux maybe.

Arrrrggggghhhhh. Too many options!!! What would YOU recommend?

Steve

P.S. I was going to upload some pics but couldn't work out how to do it. Might try again later.

 

[SB4U]

Thanks for the reply. I suppose I thought the washers would stop the fixings (and my hammer) going through the boards. Almost all the boards are now dot and dabbed into place so it might be difficult to get a rawlplug in the right location. Or would it?

 

[Old Mod]

Like I said, hammer fixings are something I know nothing about I'm afraid, maybe someone else could shed some light on that for you.
All I do is drill, plug and screw to the washers.
I don't understand personally how getting a hammer fixing in the right place is any easier than drilling for the plug.
Maybe u could shed some light on that for me?

 

[SB4U]

My thinking was that there's a gap between the board and the wall so it might be difficult to manoeuvre a plug in. But what I didn't think about was that I'll be going through the dot adhesive anyway of course, so it shouldn't be a problem actually. Thanks again.

And thanks for the advice about the architraves too.

 

[SB4U]

Hi. I should have finished boarding the walls by this weekend and be ready to apply the Waterguard membrane. I must admit that I didn't enjoy working with the Aquapanels. Some of them were a bit warped which made levelling them a bit tricky. Plus I dot and dabbed them one evening with a view to mechanically fixing them the next evening. However, they fell off the wall during the night so, lesson learned there. I also should have marked more accurately where the adhesive dots were to make it easier to decide where to put the fixings.

Should I bother taping the joints of either the plasterboard or aquapanels? The aquapanels will be mostly covered by the Watergaurd tanking membrane as I've got enough to cover the floor and well up the walls in the showering area. Is there anything I need to consider before applying the Waterguard.

Just thinking ahead, do you have any recommendations for a suitable tile adhesive to fix my large tiles to the Waterguard (and the non waterguarded areas of course)?

 

[SB4U]

I've now almost finished tanking the walls of the shower area (pics attached). Just need to apply the butyl beading to the joints. The Waterguard membrane was really easy to apply once I got the hang of it. I found the best way to install it was to stick the top bit on first and then gradually peel off the backing a bit at a time and smooth as you go. Super simple even for me. Annoyingly though I miscalculated what I needed and have ended up 1.8 metres shy of what I need to complete the floor so if anyone's got any offcuts they'd sell me I'd appreciate it rather than buying a whole 5m length. I tried Impey but they haven't got any spare unfortunately.

One other thing I want to check with you is that, as the floor to ceiling height is a bit more than 2400 I've got a gap at the top of the plasterboard that's up to 4cm at the most. Should I try to fill that before I tile or can I just fill it with tile adhesive when I get there do you reckon?

Steve