JamesP Posted October 10, 2017 Share Posted October 10, 2017 I was planning to fit 150mm celotex, UFH, screed then engineered flooring on top of the 100mm concrete slab but due to rising costs and supply issues wondering about an alternative approach. I have enclosed a drawing (by hand) which shows the build up. 2x75x47 cross laid, base timber @ 600mm centres, top timber @ 400mm centres. 2x70mm Rockwool flexi. Then vapour barrier, is it needed? , 22mm structural flooring, 25mm underfloor heating, 18mm Knauf Brio floating board and finally 15mm engineered flooring. Looking at the list not sure if it would be any cheaper but will cost it up. Does anyone have any costs for floor screed per sqm as a guide. Your thoughts appreciated as always, Link to comment Share on other sites More sharing options...
Russell griffiths Posted October 10, 2017 Share Posted October 10, 2017 I'm not sure what you are trying to achieve with this make up, it looks very much like a mix up of two types of floor suspended timber and concrete slab. It looks far to complicated for me. why not. compacted stone sand blinding dpm 200mm eps ufh concrete slab engineered timber Link to comment Share on other sites More sharing options...
JamesP Posted October 10, 2017 Author Share Posted October 10, 2017 2 minutes ago, Russell griffiths said: I'm not sure what you are trying to achieve with this make up, it looks very much like a mix up of two types of floor suspended timber and concrete slab. It looks far to complicated for me. why not. compacted stone sand blinding dpm 200mm eps ufh concrete slab engineered timber The concrete slab is already in. Celotex seems in short supply at the moment and the cost has risen another 20% so was considering a suspended floor instead, it also avoids the final screed cost as well. Link to comment Share on other sites More sharing options...
Declan52 Posted October 10, 2017 Share Posted October 10, 2017 How much have you to play with in total, 150mm for insulation and then 100mm for screed or can you squeeze any more. Link to comment Share on other sites More sharing options...
JamesP Posted October 10, 2017 Author Share Posted October 10, 2017 1 minute ago, Declan52 said: How much have you to play with in total, 150mm for insulation and then 100mm for screed or can you squeeze any more. 150mm insulation and 80mm including final timber, about 65mm screed. Link to comment Share on other sites More sharing options...
Declan52 Posted October 10, 2017 Share Posted October 10, 2017 The timber route might as you say end up costing more mainly due to the extra amount of labour involved. Are you able to do this yourself to save money. How much is the kanuf brio boards, doesn't look a cheap option. Long term the Rockwool being not as good an insulator as the celotex will cost you more in the long run. Link to comment Share on other sites More sharing options...
JamesP Posted October 10, 2017 Author Share Posted October 10, 2017 7 minutes ago, Declan52 said: The timber route might as you say end up costing more mainly due to the extra amount of labour involved. Are you able to do this yourself to save money. How much is the kanuf brio boards, doesn't look a cheap option. Long term the Rockwool being not as good an insulator as the celotex will cost you more in the long run. Its just me and my Dad so labour costs are not an issue. I have asked Rockwool for a U value for floor, walls and roof. I will cost it all up, Celotex is going to cost at least 4k + the screed cost which might be another 3k. Link to comment Share on other sites More sharing options...
PeterW Posted October 10, 2017 Share Posted October 10, 2017 7 minutes ago, JamesP said: Its just me and my Dad so labour costs are not an issue. I have asked Rockwool for a U value for floor, walls and roof. I will cost it all up, Celotex is going to cost at least 4k + the screed cost which might be another 3k. How much insulation do you need in square metres..?? Celotex aren’t the only supplier and if you keep an eye on Seconds&co you may find a bargain. Link to comment Share on other sites More sharing options...
JamesP Posted October 10, 2017 Author Share Posted October 10, 2017 3 minutes ago, PeterW said: How much insulation do you need in square metres..?? Celotex aren’t the only supplier and if you keep an eye on Seconds&co you may find a bargain. I need about 80 sheets. Will look again at Seconds. Link to comment Share on other sites More sharing options...
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