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Super foil v fibre insulation
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ahfat41
Posts: 374 Forumite
My loft insulation needs topping up. Was thinking if super foil instead but do not know much about it. Can anybody advise and the cost to insulate. Thanks
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Super foil - is it the one 30mm thick? 1 m²K/W R value?
It does reduce heat radiation, but 30mm cannot do much to stop heat loss by conduction.
I think for mineral wool the current requirement is 25cm. And its R-value is about 2.25 AFAIK. So, if you need, say, 15cm extra of mineral wool, i.e. about 3.4 extra in terms of R-value, then it has to be more than 3 layers of the above 'super foil'.
Don't trust my calculations - do you own.0
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