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What is a composition shingle roof and how long does it last?

Short answerA composition shingle roof is the common asphalt shingle roof: a fiberglass mat with asphalt and mineral granules. InterNACHI estimates about 20 years for 3-tab and 30 for architectural shingles, less in heat or under trees. Most qualify as Class A fire-rated. Get a free written estimate when yours is due.

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Updated · Sources reviewed November 12, 2026 · By Bay Area Roof Replacements

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What's the difference between 3-tab and architectural?

3-tab shingles are flat, single-layer and uniform; architectural (dimensional, laminated) shingles have layers that look thicker and last longer. InterNACHI lists about 20 years for 3-tab and 30 for architectural (InterNACHI).

What shortens shingle life in the Bay Area?

Inland heat in places like Concord, Livermore and San Jose; moss, shade and needles under trees in Marin and the hills; poor attic ventilation; and walking on the roof.

Are composition shingles fire-rated?

Most asphalt shingle roofs qualify as Class A, according to the CDI (Safer from Wildfires). Check the product's listing.

What deck do shingles need?

Asphalt shingles must be fastened to wood structural panels or solid lumber sheathing (CRC R905.2.1), which is why shake roofs on spaced boards need new sheathing.

How do they compare with metal?

See metal vs. shingles.

For your actual price, request a free written estimate: a licensed roofer measures the roof and prices your exact scope.

Every roofer we work with is licensed, insured and highly reviewed by Bay Area homeowners.

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Frequently asked questions

Is composition the same as asphalt shingle?

Yes. Composition shingle is the common term for asphalt shingles with a fiberglass mat.

How long do architectural shingles last?

InterNACHI estimates about 30 years.

Are composition shingles Class A?

Most asphalt shingle roofs qualify as Class A, per the CDI.

Related questions

Sources

Sources reviewed November 12, 2026. Figures are published estimates and official fees, not quotes. Confirm prices, permits and requirements with your contractor and building department. This page is general information, not legal or insurance advice.