GrantMcscott Posted March 20, 2019 Posted March 20, 2019 Hi Need some advise My Architect has specified 70mm thk. Kingspan Kooltherm K103 which has a U-Value of 0.17. I was think about using 150mm with a U-value of 0.1 but is it worth the extra money. It is about double the price for the 150 mm I am having under floor heating down stairs thanks
PeterW Posted March 20, 2019 Posted March 20, 2019 70mm is bare minimum and just meets regs. You can get 100 as seconds, do it 200mm thick and you’re laughing. It’s definitely worth doing.
Ferdinand Posted March 20, 2019 Posted March 20, 2019 To convince yourself run some numbers including 10 years of heating bills.
Dreadnaught Posted March 20, 2019 Posted March 20, 2019 (edited) Insulation costs just once but pays back each and every year. I would say yes, upgrade it, for three reasons. Energy and so ££ saving. A more constant (and so comfortable) internal environment. Improved sound proofing. Value airtightness too. You evidently know about things if you are quoting U-values. If you haven't done so, consider thermal modelling of your building, even just a little. PHPP or Jeremy's spreadsheet. It can be revealing. Edited March 20, 2019 by Dreadnaught
gravelld Posted March 20, 2019 Posted March 20, 2019 Also consider the cost and ball-ache of fixing it later. We will probably have to fix the current just-passing-regs walls in the future.
A_L Posted March 20, 2019 Posted March 20, 2019 3 hours ago, GrantMcscott said: My Architect has specified 70mm thk. Kingspan Kooltherm K103 which has a U-Value of 0.17. I was think about using 150mm with a U-value of 0.1 but is it worth the extra money 3 hours ago, Dreadnaught said: If you haven't done so, consider thermal modelling of your building, even just a little FWIW SAP says the difference in central England is about 4.4kWh per m2 per year
nod Posted March 21, 2019 Posted March 21, 2019 Mine was also 70 mil Spected by the architect Which I found strange As he was so precise on the type of block and u values We put 150 kingspan down Main reason behind was that it is one of those things that you can never change at a later date
Ferdinand Posted March 21, 2019 Posted March 21, 2019 9 hours ago, A_L said: FWIW SAP says the difference in central England is about 4.4kWh per m2 per year ie £20-50 ish pa for a 100 sqm floor area, depending on your heating. F
GrantMcscott Posted March 21, 2019 Author Posted March 21, 2019 thanks for the reply's looks like I will spend the extra
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