matthyde83 Posted January 14, 2022 Posted January 14, 2022 We’re going with a traditional slab but I’m discussing the exact build up with my SE and wondered peoples opinions on best and most efficient… So assuming UFH would you go slab, insulation, screed or insulation and slab only with UFH in the slab etc? Is it better to have a thin chemical screed for faster heat up? We have predetermined FFL so I need to get the build up right to work out how far to dig down.
Conor Posted January 15, 2022 Posted January 15, 2022 Keep it simple - compacted hardcore, slab to engineer's spec, DPM, at least 150mm PIR, UFH, and either 50mm liquid screed or 100mm sand and cement. We originally went for the latter but changed to 200mm insulation and 50mm liquid screed at the last minute - had extra insualtion and works out cheaper by about £4/m²
matthyde83 Posted January 15, 2022 Author Posted January 15, 2022 31 minutes ago, Conor said: Keep it simple - compacted hardcore, slab to engineer's spec, DPM, at least 150mm PIR, UFH, and either 50mm liquid screed or 100mm sand and cement. We originally went for the latter but changed to 200mm insulation and 50mm liquid screed at the last minute - had extra insualtion and works out cheaper by about £4/m² So 50mm liquid screed plus extra insulation worked out cheaper than a sand and cement screed? That's interesting. It's where my head was going too tbh. The Architect, SAP and SE are going standard building regs with 150mm insulation and I'm trying to work out best way of increasing it i.e. do I reduce screed or just dig deeper. Sounds like a chemical screed works well for you. Plus cashflow is king so pushing the insulation back to after we have a superstructure helps!
Conor Posted January 15, 2022 Posted January 15, 2022 8 minutes ago, matthyde83 said: So 50mm liquid screed plus extra insulation worked out cheaper than a sand and cement screed? That's interesting. It's where my head was going too tbh. The Architect, SAP and SE are going standard building regs with 150mm insulation and I'm trying to work out best way of increasing it i.e. do I reduce screed or just dig deeper. Sounds like a chemical screed works well for you. Plus cashflow is king so pushing the insulation back to after we have a superstructure helps! It only worked out cheaper as I had enough extra 50mm EPS available as we decided to use TLA on the upper floors after it was bought. The liquid screed at 50mm is £13.50m² and 100mm sand and cement is £17m²
matthyde83 Posted January 15, 2022 Author Posted January 15, 2022 17 minutes ago, Conor said: It only worked out cheaper as I had enough extra 50mm EPS available as we decided to use TLA on the upper floors after it was bought. The liquid screed at 50mm is £13.50m² and 100mm sand and cement is £17m² Ok thanks. + 50mm less digging and take away!
Conor Posted January 15, 2022 Posted January 15, 2022 Actually, just looked at the quote again and the screed is £15/m². Still a bit cheaper. But more importantly faster drying time.
Thorfun Posted January 15, 2022 Posted January 15, 2022 1 minute ago, Conor said: Actually, just looked at the quote again and the screed is £15/m². Still a bit cheaper. But more importantly faster drying time. that's a good price. the quote for ours comes in at about £19/m². but we are in SE England where prices are inflated!
JohnMo Posted January 15, 2022 Posted January 15, 2022 Similar to above, 200mm PIR, an additional polythene layer, UFH pipes, but 100mm concrete floor. We did the complete floor, insulation, UFH and top 100mm prior to walls. Found it easier that way.
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