Adhesive on wall & tile ?

[sh]

Hi
I have the following scenario :
Bathroom to be fully tiled on walls that will be chased back to the brick / blockwork then recovered in sand / cement / waterproof render (no plaster)
Tiles to be used are glazed porcelain measuring 412 mm x 827 mm x 10mm with a square meter weight of 25kg (no adhesive).
I will be using a powder, cement based adhesive and my question is simply, will I need to apply adhesive to both the wall and the tile for a secure fixing ?
If so, what size notched trowel ?
Thanks in advance

 

[Richard C]

No you don’t (shouldn't) need to back butter wall tiles but why are you using a waterproof render as a tile base, do you have solid external walls &/or damp problems? You may be far better off fixing waterproof tile backer board direct to the blocks & tile over that; it will also ensure you have a really flat base which is going top be important with tiles that size. If you stick with a 12mm conventional render base rather than a quickset render, don’t attempt to tile it until fully dried out – like 28 days!

Use a thick bed, solid bed trowel - 20mm round notches, 10mm deep, at 28mm centres.

Before you do any more work or buy materials, I would advise you read the tiling forum sticky & archive posts, it could prevent you making disastrous & potentially expensive mistakes. Use only quality trade tiling materials of the correct type for your tiles & tile base, cheap own brand & DIY products are mostly crap.

 

[sh]

Hi
Thanks for the extensive reply.
The plasterer that I use suggested rendering the walls as 3 of the 4 are a 'clinker block' (1920's property) and having used him before I know he will finish it very flat.
He mentioned adding the waterproofing to help in the shower area (which I was going to waterproof anyway) . I thought it may just help if the grouting fails at any time.
I am just deciding on an adhesive which will definately be a quality cement based powder and not an own brand or shed product.
Thanks Again