I am in the early design phase of a small (12’x20′) addition for a client in climate zone 5 and am just looking for suggestions as to the best new construction insulation & air sealing details to use.
It will be wood frame construction with a crawl space and a gable roof with vaulted ceilings inside.
I am leaning toward the zip wall sheathing system on walls & roof deck with a rainscreen on top and fiberglass batts in the 2×6 stud bay. Is the zip wall roof sheathing of sufficient thickness to allow me to build an unvented roof without having to spray 2-part foam on the underside?
Open to any/all suggestions