What our climate does to a roof
Western Oregon is gentler on roofs than people assume in some ways and harder in others. We're easy on shingles when it comes to hail and extreme heat, the two big shingle killers elsewhere. We're hard on them with eight months of moisture, moss that never takes a year off, and winter windstorms that test every seal strip.
Net result: an Oregon roof rarely dies of sunburn. It dies of moisture-related causes (moss, debris, trapped water) or wind working at its edges, and both of those are far more manageable than weather you can't do anything about.
What shortens a roof's life
The early-retirement list, in rough order of damage done:
- Moss left to establish. It holds moisture and lifts shingle edges season after season. (The full story.)
- Debris and clogged drainage, keeping the roof wet between storms. (Gutters count too.)
- Poor attic ventilation, cooking the shingles from below in summer and feeding condensation in winter.
- Rushed installation: bad flashing, misplaced nails, skipped details. Invisible on day one, decisive by year fifteen.
- Pressure washing. One aggressive cleaning can take years off. (Why we never do it.)
What genuinely extends it
The flip side is encouraging: the same short list, done right, pushes a roof toward the top of its range. Regular cleaning and moss treatment, clear valleys and gutters, healthy ventilation, and small repairs handled while they're small. Our maintenance program exists because this list is boring and predictable, which is the best kind of list.
Installation quality you only get to choose once, at replacement time. It's worth choosing well. (The 10 questions that sort contractors.)
Reading your own roof's age
Signs a roof is entering its final years: granules collecting in gutters and at downspout exits, shingles losing their color in patches (the surface coming off), curling or cupping edges, and repairs arriving more often than birthdays.
If you don't know your roof's installation date, an assessment can estimate its remaining life from condition. That number is the foundation of every good replacement decision, and ours are free. When you have it, the Replacement Guide walks you through the rest.