Christian McArdle wrote:

25 or 30mm foam underneath


From memory, don't you need 50mm underneath? You need around 100mm
Kingspan/Celotex to get to loft conversion standards, don't you?

Nope, 75 - 80mm should be fine...

I put 50+30mm in total on ours, and the BCO passed it yesterday ;-))



--
Cheers,

John.

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