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How Long Do Asphalt Shingles Last?

Most asphalt shingle roofs last between 15 and 30 years. Architectural shingles generally last longer than 3-tab shingles because they are thicker and heavier.

The biggest enemy of a shingle is the sun. Ultraviolet radiation breaks down the asphalt binder over time, which is why shingles are coated with mineral granules. Once granules wear away, the asphalt underneath ages much faster.

Heat also matters. Roofs in hot climates age faster, and poor attic ventilation raises shingle temperatures and shortens roof life. Daily heating and cooling causes the shingles to expand and contract, which leads to cracking over time.

Wind and hail can end a roof's life early no matter how old it is. Older shingles lose their seal strength and are more likely to blow off in high winds.

In my 20 years of roofing, most of the blow-offs I see come from shingles that were nailed too high. Homeowners should always ask their roofer about nailing patterns before signing a contract.

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