Hi, We had an extension to our house and finishing some of it myself. Part of the extension was a storeroom/garage on the side with a bedroom above it. I know building regs want Rockwool, Celotex and pink board to finish but I am wondering should I: Cut the Celotex to size and fit between the joist with the rockwool above it also? or... Put the Rockwool between joists and then sit the celotex sheets across joists? I have read on a couple of other sites about being careful of condensation if not enough space around Celotex etc so am a bit confused what best approach is. Any tips would be really appreciated? Cheers, Matt