Except that the rafters themselves form 'cold bridges' so you won't see a 2:1 reduction..
Do the calcs. It may make a tad less difference than you suppose, with the cold bridging..so much so it may not be worth doing at all.
>
Except that the rafters themselves form 'cold bridges' so you won't see a 2:1 reduction..
Do the calcs. It may make a tad less difference than you suppose, with the cold bridging..so much so it may not be worth doing at all.
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