Venting Sauna Roof
I’m building a 10 x 12 outdoor sauna with a wood stove as the heating source. The interior will have a foil vapor barrier. The walls and ceiling will have mineral wool insulation, then plywood sheathing. It will have a low slope 1:12 roof with 2×6 rafters as the finished ceiling. It will be used a maximum of 1 hour per day, and I’m wondering if I need to vent the roof.
If so, I could put in rockwool R23 and use 2×8 rafters to have a 2 inch space above the insulation for venting. Or 2×6 with rockwool r15. Or I could not worry about it and do rockwool R23 with 2×6 rafters and no vent and not worry about it. How much of a concern is roof wetting/rot/mold in this type of building?
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