Bathroom Insulation

DFB-D

Just looking for thoughts on this.

I have a bathroom to insulate before tiling. I was thinking of using insulated plasterboard down to groundfloor ceiling and tanking (either a tanking kit or the sheets) around the edges and shower area.

Or using insulation foam and moisture boards.

However, I found these https://shop.uniproof.ie/products/tile-backer-board-1?variant=40425996910746

which seem ideal but expensive compared to warmboard or insulation and moisture board.

Has anyone used them, or do you have thoughts about using insulated plaster boards? I think with proper tanking they would be ok?

Grassy Knoll

Hi did my bathroom last year. Drylined the inside of the exterior wall with insulated plasterboard. The floor was suspended timber - we were laying 1.2 m floor tiles. As these are thin and liable to crack the guy braced the existing floor joists To stop movement. he laid fairly thick ply and on top of this then concrete boards for the final sub surface. Over 12 months later no give or cracks on the tiles.

we remodelled the shower so he tanked the wall and plasterboard (green moisture resistant) job is oxo

policarp

I was told to always keep plasterboard at least 15 to 20 mm. above the floor level.

Especially in bathrooms and kitchens.

DFB-D

https://www.boards.ie/discussion/comment/120811489#Comment_120811489

I heard the same, I presumed that is moisture related rather than expansion reasons.

Hopefully tanking at the bottom will be ok, want to avoid cold bridges, it is a very cold bathroom by default..

DFB-D

https://www.boards.ie/discussion/comment/120811367#Comment_120811367

Thanks, similar to my job I think & sounds good!