Fixing hardibacker to rendered /skimmed wall

[Chris34]

Hi all,

I'm redoing my bathroom that I did 15 odd years ago. Before it was tiled with 20x20 tiles, no moisture has got through and the walls were still sound.

Shower end is stud wall which I removed the board and reboarded with new pipe work inside for the new shower.

The side wall is a rendered / gypsum finished block wall (celcon type block) which a lot of the thistle finish came of with the tiles with quite a bit of effort, the remaining thistle was rock hard fixed so was left in place.

I PVA'ed and reskimmed all walls including the boarded wall and made flat with "make good multi finish" same as thistle finish I think

I now realize that as its a shower in a bath it now needs to be tanked, I've also realized that the plaster may not be strong enough for the tiles I've chosen (600x300) can't get on the website but I think 11-12mm thick!

The boarded wall 1m wide I could remove the plasterboard and reboard with 12mm hardibacker.
But what about the full wall 2m wide can I add 6mm hardibacker to this and fix through the plaster and render to the block or do I need to chisel it off and fix direct to the blocks? The render appears to be solid hence I skimmed it but i guess if screwing is an option screwing to the block is a better idea?

I planed on tiling around the whole bathroom this time, the other walls being plaster boarded walls but a strange type of construction plasterboard walls with a cardboard lattice connecting both sides of the wall with 34x something struts every 300 to 400mm I could screw through 6mm hardibacker board to theses struts would this be ok?

Thanks in advance,
Chris.

 

[Dave]

Are they ceramic or porcelain tiles ?

 

[Chris34]

Hi Dave,

The suppliers web site is finally working "Porcelain tiles" doesn't say thickness but i think 11 or 12mm but i can check.

This is one of the tiles for one wall the others the same but flat

Geological Beige Hexagon Rectified

Following the very latest Urban Style trend, the Geological Floor Tile Range comes in 5 colour shades.Sober and elegant at the same time, ideal for modern interior and exterior design in a range of different sizes to suit your home.The generous 600x600 mm size helps make this collection ideal for la

www.tilesuk.com

Thanks,
Chris.

 

[Dave]

Ok , they’ll more than likely be too heavy for that wall. Have you got room to dryline it. ? , then tanking paste it.

 

[Chris34]

Thanks for helping Dave
was thinking it would be

No not really the room too small to dry line. Guess you mean batten and then board with hardibacker or the likes on top of the render and plaster?

whats the best plan hack off the render back to the block going to be hard to get it off.

no idea how flat it will be until its off the render wasn't very flat but i assume that was just the rendering.


The stud wall plaster board off and hardibacker?

Thanks,
Chris.

 

[Dave]

Just dryline with pb and tank the wet areas. Attach with dryline adhesive. Quicker and cheaper than using hardi.