My dormer roof originally had rolled roofing. It never lasted more than a couple of years before needing repairs. After replacing it twice, I finally had it shingled. Several roofers told me the pitch was too low for shingles. I took photos from the side to figure out the pitch and determined through internet research that in fact the pitch was within the limits for conventional shingles. I did use Grace ice and water shield. That was about 5 years ago. Not a single problem since then.
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