When you reach the top on the other side of the roof, run that paper up and over as well. Your local building official may want to inspect your roof at this point, but sometimes, you can get by by snapping a few photos. Ask about the inspection schedule when you pick up your permit. Continue up the roof, ensuring each upper course overlaps the one below it by at least two inches. It’s important to ensure all your underlayment lies flat before you fasten it to the decking.

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