Hi, just wondering if any one could help with a question I have. We are part way through our extension project, underfloor heating pipe work to go down this weekend.
Originally was going to have dpm, 100mm of subfloor concrete slab, 25mm blinding sand, more dpm, 100mm celotex board, then vapour barrier (and to protect foil on the celotex from the special poured self levelling screed) then pipes then 65/75mm poured screed.
My question is if the blinding sand is just to protect the dpm from sharp bit on the concrete slab can I swap it out for 25mm celotex board? (Ive got loads of it... dont ask!)
The builders have done a great job on the concrete slab, seems pretty level with no sharp stuff.
Many thanks
Originally was going to have dpm, 100mm of subfloor concrete slab, 25mm blinding sand, more dpm, 100mm celotex board, then vapour barrier (and to protect foil on the celotex from the special poured self levelling screed) then pipes then 65/75mm poured screed.
My question is if the blinding sand is just to protect the dpm from sharp bit on the concrete slab can I swap it out for 25mm celotex board? (Ive got loads of it... dont ask!)
The builders have done a great job on the concrete slab, seems pretty level with no sharp stuff.
Many thanks