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In regards to roofing, Owens Corning has a great checklist and you can find it at the link below! Here are just a few items to check though:
-Accredidation and good standing with the BBB
-Additional Warranty and Workmanship Coverage
-Verify how long they have been in business
-Addequate Insurance (at least $1,000,000 in general liability insurance)
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