bmj1 Posted November 5, 2023 Share Posted November 5, 2023 Proposed GF buildup: 1) beam and block (already done) 2) radon barrier 3) 75mm phenolic insulation 4) slip membrane 5) UFH pipes 6) 40mm liquid screed We are very height constrained.. I'm just wondering if there is any kind of radon barrier or slip membrane that would help me reflect the heat upwards ? Link to comment Share on other sites More sharing options...
JohnMo Posted November 5, 2023 Share Posted November 5, 2023 Reflective membranes need an air gap to function. Poor insulation for UFH, maybe not want you hear, install radiators. Link to comment Share on other sites More sharing options...
bmj1 Posted November 5, 2023 Author Share Posted November 5, 2023 44 minutes ago, JohnMo said: Reflective membranes need an air gap to function. Poor insulation for UFH, maybe not want you hear, install radiators. Thinking was that 75mm phenolic is like 90mm PIR... Should be okay? Especially with a liquid screed so heat won't have much resistance going upwards Link to comment Share on other sites More sharing options...
JohnMo Posted November 5, 2023 Share Posted November 5, 2023 2 hours ago, bmj1 said: Should be okay? I personally wouldn't, but your call Link to comment Share on other sites More sharing options...
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