Manufacturer lifespan ratings assume typical temperate climate installation. Florida conditions — intense UV, 90%+ humidity, salt air within miles of the coast, and an active hurricane season — reduce asphalt shingle lifespans by 20-30% versus national averages:

• 3-tab asphalt: 15-20 years nationally; 12-18 years in Florida
• Architectural asphalt: 20-30 years nationally; 18-22 years in Florida
• Standing seam metal: 40-70 years; unaffected by FL climate; non-corrosive coatings rated for salt air
• Concrete tile: 25-50 years; performs well in Florida
• Clay tile: 50-100 years; performs excellently in Florida
• Wood shake: 20-25 years nationally; not recommended in Florida due to humidity and fire risk; many insurers won't write it
• TPO flat: 15-30 years; seams require more frequent inspection in Florida heat

The insurance company's view of lifespan: Florida insurers increasingly use their own age thresholds independent of manufacturer warranty. A "25-year shingle" installed 16 years ago is treated as a 16-year-old roof for underwriting purposes — and the private market largely stops writing at 15.

1. Granule loss: asphalt shingles shed granules as they age; heavy accumulation in gutters or at downspout exits indicates advanced UV degradation. Loss of granules accelerates moisture penetration.

2. Cupping or curling shingles: the edges of shingles cup upward (moisture imbalance) or the middle cups downward (age). Either creates vulnerability to wind uplift and water infiltration.

3. Daylight in the attic: visible daylight through rafters in the attic indicates missing or failed sheathing/underlayment. A flashlight attic inspection at any open house is a 2-minute diagnostic.

4. Multiple missing shingles or patching history: a roof that has been patched in multiple locations is reaching the end of its repair cycle; replacement is more cost-effective than continued patching.

5. Algae streaking and moss: black streaking is algae (Gloeocapsa magma); green moss indicates moisture retention. Both degrade granules and shingles. Treatment extends life if caught early; heavy infestation on an aging roof signals replacement.

Buyers frequently ask "how old is the roof?" and receive answers that are genuinely unknown, approximate, or strategically vague:

• Permit records: if a replacement was permitted (required in most Florida jurisdictions), it appears in the county building department records — searchable by address, free, and authoritative.
• Insurance history: if the seller had a homeowners claim related to roof damage, the repair may appear on the CLUE (Comprehensive Loss Underwriting Exchange) report.
• Visual dating by inspector: a certified roofing inspector can estimate age from granule loss pattern, material technology (shingle designs that are dated to manufacturing eras), and physical condition.
• Manufacturer date codes: many shingles are manufactured with date codes on the packaging; in a partial attic inspection, leftover shingles from the installation may still be present with date codes.

On any Florida property where the roof age is uncertain: order a permit search ($0, 5 minutes online at the county building department) before scheduling a showing. An unverifiable or missing permit on a "10-year-old roof" is a yellow flag that warrants a roofing inspector before the standard home inspection.