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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)
Always be sure to ask the contractor for current references from recently completed projects. This ensures that his current employees and subs are providing the quality workmanship that you deserve.
There could be infection spreading under the bark. Sooty Canker is one possibilty, black powdery fingus spreading under the bark. Have an arborist look at it. May be able to remove infect branches, treat with fungicide and save the tree if it has not progressed too far
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