The cold side of the compsite wall needs to breathe.
Bob
It is currently 28 Mar 2024, 19:40
9fingers wrote:The cold side of the compsite wall needs to breathe.
Bob
bulla wrote:Mike G wrote:You don't put a vapour barrier on the wrong side of the insulation.
I was wondering more why in this case the Kingspan being foil backed, and foil taped doesn't act as the vapor barrier ?
Mike G wrote:bulla wrote:Mike G wrote:You don't put a vapour barrier on the wrong side of the insulation.
I was wondering more why in this case the Kingspan being foil backed, and foil taped doesn't act as the vapor barrier ?
It isn't continuous. It stops and starts at each stud, and around the edges. Each of those joins is a place for air, with its water vapour, to penetrate the structure. You would then have warm moist air meeting the cold impermeable inside face of the OSB, where it would condense. Those damp patches would allow the growth of mould, and in the end, rot.
Mike G wrote:bulla wrote:Mike G wrote:You don't put a vapour barrier on the wrong side of the insulation.
I was wondering more why in this case the Kingspan being foil backed, and foil taped doesn't act as the vapor barrier ?
It isn't continuous. It stops and starts at each stud, and around the edges. Each of those joins is a place for air, with its water vapour, to penetrate the structure. You would then have warm moist air meeting the cold impermeable inside face of the OSB, where it would condense. Those damp patches would allow the growth of mould, and in the end, rot.
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