I
Indy
Hi,
Firstly thank you to Dominic at Diamond Tiling for answering a lot of my questions and directing me here.
I have roughly 70sq/m of suspended floor and appx 30sq/m of concrete floor which all need tiling over a wet under floor heating system.
On the concrete floors I have laid down 4" of Celotex insulation and was planning on running my pipework over these boards. Then I'm intending on screeding over this with a dry mix before my tiles are laid onto that.
The suspended floor joists have all been battened underneath and I have laid down the insulations boards in between the joists to leave me with appx 60mm to lay my pipes and screed or have an air gap. My question is this,
1) Do I screed over the pipes, all 60mm of it and then lay the tiles on top of the screed and joists?
2) Do I leave a 60mm air gap on top of the insulation and ply over the joists (I was thinking 18mm ply but have been told that this is far too thick)
3) or do I lay 60mm of screed and then ply using 6mm backer boards with some type of membrane underneath to decouple the tiles from the floor underneath.
I've read up on similar posts and 3 sounds about right but I'm concerned that I may get cracking in the grout and movement in the tiles especially since some areas will go from being a suspended floor to a concrete floor all in the same tiling zone.
Any help would be much appreciated.
Cheers
Firstly thank you to Dominic at Diamond Tiling for answering a lot of my questions and directing me here.
I have roughly 70sq/m of suspended floor and appx 30sq/m of concrete floor which all need tiling over a wet under floor heating system.
On the concrete floors I have laid down 4" of Celotex insulation and was planning on running my pipework over these boards. Then I'm intending on screeding over this with a dry mix before my tiles are laid onto that.
The suspended floor joists have all been battened underneath and I have laid down the insulations boards in between the joists to leave me with appx 60mm to lay my pipes and screed or have an air gap. My question is this,
1) Do I screed over the pipes, all 60mm of it and then lay the tiles on top of the screed and joists?
2) Do I leave a 60mm air gap on top of the insulation and ply over the joists (I was thinking 18mm ply but have been told that this is far too thick)
3) or do I lay 60mm of screed and then ply using 6mm backer boards with some type of membrane underneath to decouple the tiles from the floor underneath.
I've read up on similar posts and 3 sounds about right but I'm concerned that I may get cracking in the grout and movement in the tiles especially since some areas will go from being a suspended floor to a concrete floor all in the same tiling zone.
Any help would be much appreciated.
Cheers