Sign 1: Your Roof's Age
Start with the simplest indicator. Three-tab shingles last 15 to 20 years. Architectural shingles last 25 to 30. If your roof is past its expected life, every additional year is borrowed time, even if it looks fine from the street. Check your home disclosure documents or local permit records for the install date. No record? A roofer can usually estimate age from a quick inspection.
Sign 2: Curling, Cracked, or Missing Shingles
Shingles curling at the edges (called cupping) or bubbling in the middle (clawing) have lost their oils and flexibility. They are done protecting your home. A handful of damaged shingles after a storm is a repair job. Widespread curling across multiple slopes is a replacement job. After any windstorm, do a ground-level visual check for missing tabs.
Sign 3: Granule Loss
Those sand-like granules are the only thing standing between UV rays and your asphalt shingles. Check your gutters and downspout outlets for heavy accumulation. Then look at the roof itself for dark, shiny patches where granules have worn away. A balding shingle is a dying shingle. Once the asphalt is exposed to direct sun, deterioration accelerates fast.
Sign 4: Daylight in the Attic
Go into your attic on a sunny day and turn the lights off. Any pinpoints of daylight are holes in your roof. While you are up there, look for water stains and dark streaks on the underside of the decking, plus damp or compressed insulation. Persistent attic moisture also signals poor ventilation, which literally cooks your shingles from below and cuts years off their life.
Sign 5: A Sagging Roof Deck
Stand across the street and sight along your roofline. If it sags or waves instead of running straight, you likely have rotted decking, compromised rafters, or long-term water damage in the structure. This one is urgent. A sagging deck can precede partial collapse under snow or heavy rain. Call a roofer this week, not next month.
Sign 6: Moss, Algae, and Staining That Keeps Coming Back
Some algae staining is cosmetic and common in humid climates. But thick moss holds moisture directly against your shingles, accelerating decay and lifting tabs so wind can tear them off. Here is the test that matters: if moss returns quickly after a cleaning, the shingles' protective surface is gone and cleaning is just cosmetic.
Sign 7: Rising Energy Bills With No Other Explanation
A failing roof usually means failing ventilation and degrading insulation performance too. If your cooling costs have climbed 15 to 20 percent year over year and nothing else changed, your roof system, not just the shingles, may be underperforming.
Repair vs. Replace: The 30 Percent Rule
Here is the rule roofers actually use: if damage covers less than 30 percent of the roof and the roof is under 15 years old, repair it. If damage exceeds 30 percent, or you have already repaired the same section twice, replace it. Homeowners who keep patching a dying roof almost always spend more over five years than a single replacement would have cost.
Quick Self-Check You Can Do This Weekend
- Ground scan: grab binoculars and look for missing, curled, or cracked shingles from the yard.
- Gutter check: scoop a handful of debris from a downspout outlet. Heavy granules mean active wear.
- Attic check: lights off on a sunny day. Look for daylight pinpoints, stains, and damp insulation.
- Interior check: ceiling water stains, peeling paint near rooflines, and any musty smell in the attic.
What to Do Next
Get a professional inspection. Many roofers offer them free because they want the replacement job, which is fine, just get two opinions. Then check our 2026 roof replacement cost breakdown, run the numbers through the roof cost calculator, and interview roofers with these questions before you sign anything.