Best way to finish stud work for tiling

[452varmint]

Hello, i just first joined up and this is my first post so i hope this is posted in the right place.

I'm looking for some advice re tiling in bathrooms.
I'm making some alterations at home, relocating the main bathroom and adding an ensuite to the main bedroom.
At the minute the stud work has just went up and I'm just at the first fix stage getting wires / pipes and grounds in.





The ensuite is only 900mm wide (width of the shower) so it has stud wall on one side and two block walls.
In the main bathroom the shower will go in a corner and at least wall (probably both) will be studs.

I intend to have the walls tiled floor to ceiling in both rooms.
I'm a spark and was asking a tiler on a job what way i should prep the walls, he said not to bother with plaster board but to cover the stud with 19mm exterior grade plywood and then give it a couple of coats with a PVA glue / water mix, a tiler would just tile straight onto that.
He reckoned the most important thing is making the studs as solid as possible and that the ply was the best way to do this.

A plumber told me that "wadi board" (spl ???) was what most people use now but i haven't heard of that before ?

The other walls are uneven and will need to be plastered but I'm wondering if they should be plastered with finish or just levelled with a sand and cement "scratch coat".
Any help would be much appreciated.

[Oli]

Dont use PVA, I would use wediboard around the shower area, plasterboard around the other areas, you will need to tape the joints between wedi boards, they are waterproof, you could use plasterboard for the entire room and a tanking kit if you wanted, you would have to compare the costs dependant on the size of the room, as the wedi boards are quite expensive compared to plasterboard. You could also use a cement board such as hardibacker, these will not rot if wet like plasterboard, but will allow water to pass through them so not completley waterproof, wedi board is completley waterproof.

Mapei do a paint on tanking solution that can be painted over plasterboards, wetdecs a forum sponsor also does tanking kits, wetroom formers, shower solutions etc.

[Oli]

I have to ask.... Why is there are sheet of foam stuck to the wall?

[Swanseajack]

Probably the cheapest option is to use plasterboard and to tank (waterproof coating)the plasterboard in shower enclosure/wet areas.

Or you could use a 12mm cement board for walls, Weidi, Hardibacker etc. As a belt and braces I still tank wet areas when using these boards.

Make the Stud walls @ 400mm centres and put noggings in to stiffen wall (Seems you have done that from photos).

As for the uneven wall, have you enough room for dot & dabbing plasterboard to these walls and fix tiles directly to plasterboard, no need to skim. If you follow this route allow 7 days for the platerboard adhesive to dry before fixing tiles. The benefits of this it will be quciker drying than skimming the walls.

As for primming dont use PVA for primming walls ( search forum for reasons) use an acrylic primer specially designed for tiling. Depending on what size tiles you are using, a lot of the tile adhesives are self primming.

Ideally we need to know what size tiles you are using, for advice for what adhesive to use.

[smurf21]

Dont use plywood and definatly not pva i would use 12mm plasterboard all round and tank the shower area with a tanking kit or use a tile backer board in the shower area my preferance is "no more ply" coated both sides with a bonding agent bal sbr or similar makes it 100%watertight. sam for the floor.

[452varmint]

Thanks for the replies, i imagine 12mm cement board will be easier to source than Weidi, do i screw it in place rather than nail it ?
I was actually thinking the plywood was a good idea as it would save me putting grounds in for the shower and towel rails etc.

I'd rather plaster than dot & dabbing plasterboard as the rest of the house is being plastered inc. a loft conversion so there will be a lot of plastering, do i need to tell the plasterer to finish skim or just scratch with sand and cement.
Tanking ?, is that just a paint on product or is it a sheet ?, and where do i buy it, builders supply or plumbers supply ?
Would i tank the plastered areas as well as the cement board / plaster board ?

At the minute im not sure what size / type of tiles i Iwill use, just need to get the first fix completed so i get the whole job plastered out - wish i was at the tile selection stage


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I have to ask.... Why is there are sheet of foam stuck to the wall?

It's just the size of the mirror that will go above the sink, i just needed to get the height right because i have to track for the wiring - it's got lights and a heating element in it.