Short answer. A roof at the end of its service life shows multiple symptoms at once: granule loss, curling shingles, attic water stains, damaged flashing, and visible sagging. Any one alone may be a repair. Three or more together means it is time to replace.
The 10 signs in order of severity
1. Age past service life
Asphalt shingle past 20 years, flat roof past 15 years, or tile past 50 years should be inspected even with no visible problems. Underlayment fails before tile does.
2. Curling, cracking, or missing shingles
Visible from the ground or driveway. Curling means the shingle has lost its oils. Cracking means UV damage. Missing means wind exposure now reaches the underlayment.
3. Granule loss in gutters
Black sand-like material in gutters and downspouts. Each shingle loses granules over its life. Heavy accumulation means the shingle is at end of life.
4. Daylight visible through the attic deck
Climb into the attic during the day. Any pinpoint daylight visible through the deck is a hole, gap, or popped fastener.
5. Water stains on attic rafters or ceilings
Brown or rust-colored stains on rafters, sheathing, or ceilings below. Active or historic leaks. Trace the path uphill to find the source.
6. Sagging roofline
Visible dip in the roofline from the street. Indicates structural compromise of decking or rafters. Often from chronic water damage. Requires immediate professional assessment.
7. Repeated repairs in the same area
Three or more repairs at the same penetration or valley in 5 years. The system has failed at that location. Patching no longer solves the root cause.
8. Damaged or missing flashing
Flashing at chimneys, valleys, skylights, and walls is the most common leak source. Rusted, lifted, or missing flashing requires action regardless of shingle age.
9. Moss or vegetation growth
Moss holds moisture against the roof and accelerates wear. Common on north-facing slopes in shaded areas. Treatable when caught early. Indicates replacement when widespread.
10. High utility bills
An aging roof loses insulation value as decking degrades. Sudden cooling cost spikes in summer often trace to roof and attic. Worth checking before buying a new HVAC system.
What to do next
- Walk the perimeter and photograph the roof from the ground.
- Inspect the attic during daylight. Look for stains and pinpoint light.
- Check gutters and downspouts for granule accumulation.
- Request a roof inspection from a CSLB licensed roofing contractor.
- Get two opinions before signing a replacement contract.
For pricing, read cost of a new roof in Los Angeles. For tile roof care, see tile roof maintenance. For roofing services, see our roofing page. To schedule an inspection, open the contact page.
