On the roof, I will have full fill insulation and osb sarking, then battens and counter battens with steel roof sheets on top. I assume the membrane ought to go on top of the sarking.
Likewise, on the walls I have full fill insulation and osb sheathing, then battens and counterbattens and vertical timber cladding on top. Again, I assume the membrane goes directly onto the osb.
I could of course just assume that it doesn't really matter, and just to buy whatever is available and cheap, but building doesn't seem to work that way...
Edited by Crofter, 24 April 2016 - 10:59 AM.