"Christian McArdle" wrote in message
et...

Best put Rockwool up to joist height then lay Kingspan over then loft
boards.

Which doesn't give the OP his required boarded area. If he was going to
cover the boards, he might as well use rockwool, as it is better pricewise
for the same u-Value.

I think you misunderstood. Best put Rockwool up to joist height then lay
Kingspan over the joists, this prevents thermal bridging via the joists.
Then loft boards over the Kingspan. Only the part of the loft where you can
walk is worth boarding, unless all the loft is used for storage.



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