Just reading though the kingspan literature for insulating a new timber frame building and it says you need to leave an air gap between the outer sheathing.
Why is this recommend? The osb sheathing will act like a vapor barrier so the back side don't breath will it?
Is there a way to fully fill the cavity, maybe breather membrane, fully filled PIR cavity then osb on the inside?
Why is this recommend? The osb sheathing will act like a vapor barrier so the back side don't breath will it?
Is there a way to fully fill the cavity, maybe breather membrane, fully filled PIR cavity then osb on the inside?