How long do flat roofs generally last?

Modified bitumen and BUR roofs generally last 20 years on average, although well maintained roofs last longer than neglected ones. PVC roofs often carry a 25 year warranty, but often last longer than 30 years. These roofs are among the most expensive, but, over time, the initial cost may be worth it. Rubber roofs may begin to experience water ponding and seam failures after about 10 to 15 years of use.

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