Roofing, Gutters and Waterproofing - Underlayment For Low-pitch Roof - #15 vs #30
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jlynne
09-11-09, 12:44 PM
I've already learned that I'll need 2 layers under 3-tab shingles. Would #30 be preferable vs. #15? Reason I'm asking is that it's a small roof (about 75 square feet) and 1 roll is enough. I'm thinking that the heavier stuff might offer more protection, and I won't have a bunch of leftovers. Any problems there?