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How long will a 5-ply (base sheet and three plies of fiberglass felt) tar & gravel or built-up roofing system last?

April 26, 2017base built-up felt fiberglass gravel plies Roofing Sheet tar

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How long will a 5-ply (base sheet and three plies of fiberglass felt) tar & gravel or built-up roofing system last?

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A The typical life span of tar & gravel or built-up roofing system is 16 to 20 years. The longest lasting system for the money and is not impacted by areas on water that sit over 48 hours.