djcdan Posted December 10, 2021 Share Posted December 10, 2021 We're having electrics UFH upstairs. There is currently a 22mm chipboard installed across the upstairs. Three rooms will have electric UFH upstairs. Two with tiled and one with carpet. I contacted the supplier who advised either of the following options for the room to be carpeted: Quote 1. 6mm tile backer boards, 150w mat and then 10mm of self levelling compound over the top. 2. 6mm insulation boards (taped to each other with duct tape, then an underwood heating mat and finally a HeatPak Dual Overlay system installed on top of that. Both of these options will seem to add around 16mm +- to the level of the existing floor before the carpet is laid. Since the floor is carpeted either side of the threshold of this doorway, I'd want the finished floor level to be at the same level once finished. What is the answer here? Thinner underlay in the room with the UFH? Or cut out the 22mm chipboard and replace with a 9mm ply and use option 1 to create a solid floor? Link to comment Share on other sites More sharing options...
Onoff Posted December 10, 2021 Share Posted December 10, 2021 33 minutes ago, djcdan said: 2. 6mm insulation boards What does 2.6mm insulation board do then? I suspect it doesn't insulate. Link to comment Share on other sites More sharing options...
djcdan Posted December 10, 2021 Author Share Posted December 10, 2021 26 minutes ago, Onoff said: What does 2.6mm insulation board do then? That is option 2. 6mm insulation boards. But I suppose your point is still relevant, how much insulation does a 6mm board actually provide. Are you suggesting to do away for the 6mm insulation board? Link to comment Share on other sites More sharing options...
Onoff Posted December 10, 2021 Share Posted December 10, 2021 7 minutes ago, djcdan said: That is option 2. 6mm insulation boards. But I suppose your point is still relevant, how much insulation does a 6mm board actually provide. Are you suggesting to do away for the 6mm insulation board? Sorry, I took it as 2.6mm. Link to comment Share on other sites More sharing options...
Temp Posted December 10, 2021 Share Posted December 10, 2021 Take the chipboard up, insulate, lay WBP (two layers staggered joints?), seal according to tile adhesive makers instructions, UFH, tiles. Floor must be rigid enough for tiling contractor to warranty his work so discuss thickness of WBP with him. Link to comment Share on other sites More sharing options...
djcdan Posted December 10, 2021 Author Share Posted December 10, 2021 14 minutes ago, Temp said: Floor must be rigid enough for tiling contractor Floor is to be carpeted. Link to comment Share on other sites More sharing options...
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