Vented Cathedral with Less Sheathing
Hello, I’m finalizing the design on a home I will be building in zone 6 which has a 90 PSF snow load requirement. I have come up with a cathedral assembly which uses less sheathing than is typical and am looking for feedback on whether it makes sense or I should go a more traditional route (2 layers of sheathing or vent channels under sheathing).
A drawing is attached which shows the assembly. From outside to inside I’m am planning the following:
Taped Zip sheathing
2X furring strips to create air gap
Siga Majcoat with taped seams over rafters
Siga Majrex with tapes seams as my primary air barrier
2X furring strips for service cavity
Any concerns with this approach from an air/water barrier perspective? What about from a structural perspective?
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