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Afterburn has a good point.
Wood needs to breathe, and the PNW has a lot of exterior moisture.
Normally there is a warm and dry out-flux of air which solves a lot of these condensation problems.
Adding a solid barrier would create two separate zones.
Exterior sheathing (such a cedar shingles) which were previously ventilated slowly and purged in the past might not be anymore.
Maybe more breathable or a lesser insulation might be better?
(Just a thought. I don't know.)
Last edited by john70t; 12-02-2016 at 09:16 PM..
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