Most of us have little or no experience with re-roofing, so this post by home reno expert Bob Vila is a valuable guide to the questions a homeowner should ask before hiring a roofer. First, ask for an estimate that is comprehensive enough (permits, inspections, materials, labour, contingency) to establish a firm budget. Discuss the proposal in detail with the contractor.
Find out what materials are being used and get the specifications in writing. Avoid cheaper, low quality materials, especially the shingles, because sub-standard materials reduce a roof's life expectancy costing you more over the long term.
Inquire how the project will be accomplished - installing shingles on top of the existing materials may seem cheaper, but removing the existing roof materials will provide a chance to inspect the roof deck in case repairs are needed. Ask if your contractor is licensed, insured, and bonded so you aren't liable for any accidents during the project.
Finally, check how long the roof will last and ask about warranty coverage for materials (Owens Corning shingles are guaranteed for 50 years) and installation (most small contractors do NOT warrant workmanship). To read more click here.