How do I attach 6″ of rigid foam insulation to a roof deck?
July 2011 Fine Homebuilding’s article about roof venting included a method for insulating cathedral ceilinged roofs with 6″ of rigid foam topped with plywood sheathing and conventional shingles. I have a roof deck of 2×6 T&G on a post and beam constructed roof. If I want to use three 2″ sheets of XPS covered with plywood, how do I attach the foam/plywood sandwich to the roof deck? Code requires a 6″ edge and 12″ field fastener pattern.
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