Exterior Insulation for Shed Roof
I’m looking to build a shed style cottage in zone 6 in NH. I have lots of design questions. This question is looking for ideas for providing R30 continuous insulation to the EXTERIOR of a tongue and groove and rafter roof deck. This is looking like a minimum of R12 Zip +R (2.5″ foam plus OSB+barrier layer), plus 6″ of rockwool or 4″ of foam. How does one secure metal roofing through all this? Firring strips add to the distance, or even the dimple mat or 3D mesh options add some distance.
So is there a link to a good discussion of roofing options someone might share?
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