Installing Insulated wall boards

weemalkie

Hi, my bathroom has three external walls and I'm hoping to insulate using Celotex. The walls are half tiled with gloss tiles and half painted wallboard. I was planning to fix the Celotex with dot and dab directly to the existing walls and then add mechanical fixings after. My question is - will gyprock wall board adhesive do the job or will I have to remove or possible simply roughen up the tile surface?

John_Finney

I think the answer is maybe. The british gypsum tech helpline is useful.

FreeBear

weemalkie wrote: »

Hi, my bathroom has three external walls and I'm hoping to insulate using Celotex. The walls are half tiled with gloss tiles and half painted wallboard. I was planning to fix the Celotex with dot and dab directly to the existing walls and then add mechanical fixings after. My question is - will gyprock wall board adhesive do the job or will I have to remove or possible simply roughen up the tile surface?

You would be far better off using a warm batten system. In a nutshell, put up a sheet of (for example) 50mm thick Celotex. Place vertical 25x50mm battens at 600mm intervals and fix to the underlaying brickwork with 80-100mm long fixings. Fill the gaps between the battens with 25mm Celotex sheets cut to size. Finally, finish off with plasterboard fixed to the battens - In a bathroom, use a cement board around the bath/shower area and moisture resistant plasterboard elsewhere.

You'll want to remove existing plaster & tiles back to bare brick - In a small bathroom, every inch counts, and that ~20mm or so of plaster & tiles could make all the difference.