In the past on 3 other houses in different locations, I always went to the site of the company making the shingles, whether it be Owens Corning, GAF, Certain Teed, etc. Find the Top rated authorized installers in your area from their website. Those are the ones I've called for estimates. Also check into where they get their shingles, like Ro Mac. Ask them for names of installers they'd recommend.
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