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I have some questions about this trend of putting extruded styrofoam cladding on the exterior of buildings in Canada. New construction and renos.
If this cladding is a vapour barrier, and it certainly seems to be, then how does it affect the 2/3rds rule for position of a barrier, and how does it affect the regular insulation cavity between it and the normal inside vapour barrier.
I have talked to tech reps at DOW who confirm that these claddings (SM, Cladmate, etc)are impermiable, but they get pretty vague as to how these walls are supposed to breath if they are sealed on the outside.
Replies
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I have some questions about this trend of putting extruded styrofoam cladding on the exterior of buildings in Canada. New construction and renos.
If this cladding is a vapour barrier, and it certainly seems to be, then how does it affect the 2/3rds rule for position of a barrier, and how does it affect the regular insulation cavity between it and the normal inside vapour barrier.
I have talked to tech reps at DOW who confirm that these claddings (SM, Cladmate, etc)are impermiable, but they get pretty vague as to how these walls are supposed to breath if they are sealed on the outside.