The Real Reason Roofing Bids Go Wrong (It's Not the Weather)
  Ask a roofing contractor what killed their margin on a job, and weather is rarely the honest answer. The real culprit shows up much earlier at the estimating stage, usually before a single shingle is ordered. A measurement that's slightly off, a material price that's three months stale, a line item that never made it onto the sheet. None of it looks dramatic at the moment. All of it adds...
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