Your roof is designed to protect everything beneath it — but it won't last forever. Most Philadelphia-area asphalt roofs last 20–30 years, and the warning signs of failure often show up years before a major leak. Catching them early means a controlled replacement on your schedule instead of an emergency repair in a rainstorm.
ALFE Roofing has inspected thousands of roofs across Philadelphia, the Main Line, South Jersey, and Delaware. Here are the 10 signs we see most often — and what each one means for your home.
1. Curling or Buckling Shingles
Shingles that curl upward at the edges (cupping) or ripple upward in the middle (clawing) are a sign the asphalt layer has dried out and lost its flexibility. This is one of the clearest indicators of an aging roof that needs replacement soon — especially common on south-facing slopes in Philadelphia's hot summers.
2. Missing Shingles
A few missing shingles can be patched, but widespread loss — especially after a major storm — signals that the shingle tabs have lost their adhesion. Mismatched patches also compromise resale value. After any significant storm in the PA/NJ/DE area, a professional inspection is worth scheduling.
3. Granule Loss in Gutters
Asphalt shingles are coated with granules that protect against UV rays. When those granules end up in your gutters in large quantities, your shingles are entering their final stage. Bald patches are visible from the ground. On Shore properties, salt air accelerates this process — a 30-year shingle can look 20 years old after 15 at the beach.
4. Daylight Through the Attic
On a sunny day, go into your attic and look up. If you see sunlight coming through, so can rain. Any light penetration means your decking or sheathing has gaps that need immediate attention — this is also a common code violation in Philadelphia L&I inspections.
5. Sagging Roof Deck
A roof deck that sags or dips is a structural problem. It typically means the plywood decking has been wet for an extended period and has begun to rot. This requires not just shingle replacement but deck repair — which adds significantly to cost if left too long. Common in older Fishtown and South Philly rowhouses where water management has been neglected.
6. Interior Water Stains or Mold
Brown water stains on ceiling drywall or mold growing in the attic insulation are signs of a slow roof leak. By the time you see interior damage, water has likely been infiltrating for months. The longer you wait, the more expensive the repair — and the higher the mold remediation bill.
7. Your Roof Is Over 20 Years Old
Even if your roof looks fine from the street, a 20+ year old asphalt roof is approaching end-of-life. Most manufacturers void warranties on roofs this age. If your neighbors on similarly-aged homes in your Philadelphia neighborhood are replacing theirs, yours is likely due too.
8. Flashing Damage Around Chimneys or Skylights
Metal flashing seals the joints where your roof meets vertical surfaces. When it cracks, lifts, or corrodes — especially around chimneys, dormers, and skylights — water infiltrates directly into your home's structure. Deteriorating flashing on an old roof often means it's time for a full replacement rather than a spot repair.
9. Ice Dams in Winter
Ice dams form when heat escaping from your attic melts snow on the roof, which refreezes at the cold eaves. The resulting ice backup pushes water under shingles. Chronic ice damming — very common in Philadelphia, Montgomery County, and Burlington County, NJ — points to both an insulation problem and shingles that are no longer watertight.
10. Higher Energy Bills
A deteriorating roof loses its insulating properties. If your heating or cooling bills have increased significantly without an obvious reason, an aging roof that's letting conditioned air escape may be the culprit. This is especially noticeable in older construction throughout the Delaware Valley.
