Just as sloppy workmanship can have dangerous consequences on the roof, accidents on the roof can also be expensive - especially if you are liable. The lowest bidder likely doesn't pony up for comprehensive liability and workers' compensation insurance. Go with the higher bid and get proof of the proper insurance.

 

Insurance, workmanship and materials are the three main factors driving the cost of roof repairs and replacements through the roof.

Source: http://www.networx.com/article/why-roof-repair-is-so-gosh-darn-expensiv

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