How long do asphalt shingles last?

Architectural asphalt shingles last 25–30 years; 3-tab shingles last 15–20. Hot, sunny climates shorten lifespan 20–30%.

Are asphalt shingles waterproof?

They're water-shedding, not waterproof. Underlayment plus ice-and-water shield at eaves and valleys provides the actual leak barrier.

Can asphalt shingles be installed over an existing roof?

Most jurisdictions allow one layover, but most contractors recommend tear-off for warranty, weight, and inspection reasons.

Roofing · Entity

Asphalt Shingles

Fiberglass-mat or organic-mat roofing tiles surfaced with mineral granules in asphalt — the most-installed residential roof in the US.

Quick answer

Asphalt Shingles: Fiberglass-mat or organic-mat roofing tiles surfaced with mineral granules in asphalt — the most-installed residential roof in the US. Typical cost: $350–$700 per square (100 sq ft) installed; $9,000–$16,000 on a typical 2,000 sq ft roof..

Why it matters

Asphalt shingles cover about 75% of US homes because they're cheap, contractor-familiar, and adequate for 20–30 years. Choosing the right grade (3-tab vs architectural vs impact-resistant) is the single biggest lifespan and insurance lever.

Typical cost

$350–$700 per square (100 sq ft) installed; $9,000–$16,000 on a typical 2,000 sq ft roof.

Pros

• Lowest upfront cost
• Available everywhere
• Easy to repair
• Wide style and color choice

Cons

• 20–30 year lifespan vs 50+ for metal or tile
• Granule loss in hot climates
• Lower wind ratings on 3-tab
• Not impact-rated unless specifically labeled Class 4

Common uses

• Re-roofs and new construction in most US climate zones
• Rental properties and starter homes
• HOA-compliant traditional aesthetics

Alternatives

Standing-seam metalConcrete or clay tileSynthetic slateComposite shake

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Frequently asked questions

How long do asphalt shingles last?: Architectural asphalt shingles last 25–30 years; 3-tab shingles last 15–20. Hot, sunny climates shorten lifespan 20–30%.
Are asphalt shingles waterproof?: They're water-shedding, not waterproof. Underlayment plus ice-and-water shield at eaves and valleys provides the actual leak barrier.
Can asphalt shingles be installed over an existing roof?: Most jurisdictions allow one layover, but most contractors recommend tear-off for warranty, weight, and inspection reasons.

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