How feasible would it be to use iso board to insulate the rafter bays on an unvented hipped roof?
My main roof is hipped, with cornice all sides. Can i use the iso board with paper face to insulate the rafter bays from inside?
I would lay it against the sheeting, leaving 1” of air space, and seal with 2″ of foil faced foam board sealed with foil tape. Strap with 1x and finish with 5/8 drywall, creating habitable space. Roof has new light colored dimensional shingle.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part