Nobody wants to buy a roof a year early, and nobody wants to discover, mid-January, that they bought one a year late. The trouble is that a Portland roof rarely announces the difference. Asphalt shingles in our climate do not fail like a light bulb; they fail like a battery, gradually losing the granules, seal bonds, and flexibility that make them a roof rather than a layer of decoration. After 17 years and thousands of metro roofs, these are the nine signs we actually use to call a roof done, and the handful that look terrifying but are usually repairable.
1. Start with age, but adjust for Portland
Manufacturer ratings assume ideal conditions. In the metro's wet-nine-months, hot-two-months cycle, the practical numbers we see on tear-offs: three-tab asphalt shingles are done around 15 to 20 years; architectural asphalt runs 20 to 30 with good ventilation and moss control; metal, tile, and cedar each follow their own curves. Age alone does not condemn a roof, but past the 20-year line every other symptom on this list gets weighed more heavily, because the repair math changes; new flashing on brittle 22-year-old shingles is money spent twice. Why local roofs die early is its own story, and we wrote it in Why Beaverton Roofs Fail at 15 Years.
2. The nine signs, from your driveway to your attic
- Granules in the gutters. A handful after a new install is normal shedding. Steady accumulation on an older roof, with shiny asphalt showing on shingle faces, means the wear layer is leaving. Granule loss is the roof's odometer.
- Curling and clawing edges. Shingle corners lifting or cupping mean the mat has dried out. Once shingles lose flexibility, wind gets under them and every storm costs you a few more.
- Cracked or missing shingles across multiple planes. One wind-torn patch is a repair. Scattered failures on every slope are a pattern.
- Moss with roots in the shingles. Surface moss can be treated. Moss that has grown into the granule layer pries shingles apart as it swells, and after removal the shingles beneath are often bald. Our full treatment guide: moss removal and roof maintenance in Portland.
- Soft or spongy decking underfoot. If the roof flexes when walked, the plywood beneath has absorbed water. That is structural, and no shingle overlay fixes it.
- Daylight or water staining in the attic. Check on a bright day and after a hard rain. Dark streaks down rafters and damp insulation are the roof telling on itself.
- Failed flashing at chimneys, valleys, and walls. Rusted, lifted, or tarred-over flashing is the most common leak source we find. On a young roof, flashing is a repair; on an old one, it is the tell that everything is at end of life.
- Sagging ridge or roof planes. A wavy ridge line means decking or structure is giving. This one goes to the top of the list.
- Neighbors' identical houses are reroofing. Subdivision roofs installed the same summer fail the same decade. When the street starts tearing off, get inspected.
3. Repair or replace: the honest line
Localized wind damage, a single flashing failure, or a puncture on a roof under 15 years old is usually a repair, and we say so; we wrote the whole framework in replace vs repair your roof in Oregon. Replacement wins when damage is systemic (signs 1, 2, 5, 8), when the roof is past its practical service life, or when repair costs start stacking up annually. One Oregon-specific note: the code allows a maximum of two layers of asphalt shingles, so if your roof already has two, the next roof is a full tear-off by rule, and if it has one, we still recommend tear-off in this climate so the decking gets inspected and dried before it is covered for another 25 years.
4. If a storm did the damage, sequence matters
Wind and tree damage move this decision from maintenance budget to insurance claim, and the order of operations changes: document first, mitigate, get an independent inspection, then file. The full playbook is in our guide to what storm insurance covers in Oregon. Do not let an out-of-town canvasser rush you into a signature on the driveway.
5. What a real inspection should give you
A proper roof inspection walks the surface, opens the attic, photographs everything, and hands you a written condition report with a repair-versus-replace recommendation and a timeline: this roof has five good years, or two, or none. That document is worth having even if you do nothing this year, because it converts a January emergency into a scheduled summer project at a better price with material you actually chose. As a CertainTeed SELECT ShingleMaster installer, our roofing team can also register the enhanced warranty tiers when replacement day comes, which is a real difference at resale.
If your roof is past 15 and any sign on this list sounds familiar, would it help to know exactly where it stands before the fall rains arrive? We do free roof inspections across Portland and the west metro, attic included, with the written report in your hands within 24 hours.
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