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Insulation


GrantMcscott

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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

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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 by Dreadnaught
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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

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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 

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