Generic roof maintenance advice assumes a generic climate. Seattle has a highly specific annual weather rhythm, and aligning maintenance to it means each task happens when it delivers the most benefit rather than on an arbitrary schedule.
Everything you fix now is something that will not be wet for the next eight months. Everything you miss now, you live with until spring.
Clear valleys and roof surfaces of accumulated summer debris. Needles caught behind shingle courses are the organic seedbed moss establishes in.
Clear gutters and test the flow with a hose. Watch for standing water indicating slope problems, and confirm downspouts run freely.
Scan the roof from the ground with binoculars. Missing or lifted shingles, cricket behind the chimney, kickouts at wall junctions, drip edge along the eaves, black roof cement marking old repairs.
Check vent boot collars for cracking — the ten-to-fifteen-year part on a thirty-year roof.
Go into the attic on a bright day with the lights off. Daylight, staining, rusted nail tips, damp insulation, exhaust ducts terminating inside, blocked soffit vents.
Book any repairs now. Roofers get progressively busier as the rain arrives, and the work is better done dry.
Second gutter clearing once deciduous trees have finished dropping. Maple, birch, and other broadleaf debris comes down over a few weeks and will block a gutter completely.
Apply moss treatment if needed. This is one of the two productive windows — moss is metabolically active in cool wet conditions and will actually take up a treatment now, unlike dormant summer moss.
Check outdoor drainage paths before sustained rain: downspout extensions in place, discharge running away from the foundation, no blocked area drains.
This is not a maintenance period. It is a watching period, and the roof should already be ready.
After each significant windstorm, scan from the ground and photograph anything you find, dated. Remember that the most common local wind damage — broken sealant bonds — is invisible from the ground, so if a storm was severe and neighbours are finding debris in their yards, a professional look is worth it even when your roof appears untouched.
Check the attic during and after heavy sustained rain. Active leaks are far easier to trace while they are wet.
Watch for interior condensation signs — windows streaming, damp patches at ceiling corners, musty smells. This is when attic moisture problems express themselves.
During any freeze event, which we do get occasionally, watch for icicles forming at the eaves. Icicles are not decorative here; they indicate heat escaping into the attic and melting snow that then refreezes at the cold eave. That is a ventilation and air sealing problem announcing itself.
Full exterior scan for what winter changed: displaced shingles, missing ridge caps, limb damage, gutters pulled loose at the fascia.
Second moss treatment window. Growth is at its most visible after a wet winter and still metabolically active. Treat now and let it die and weather off through the dry months.
Gutter clearing after the spring conifer flush.
Attic re-check for any new staining that appeared over winter, comparing against your autumn photographs.
Our only reliable dry window, and therefore when actual work should happen.
Schedule repairs and replacement now. Tear-offs are safer and better executed in dry weather, and the risk of an assembly sitting open in rain drops to near zero.
Trim overhanging limbs. The single highest-impact preventive action available — it increases light and airflow, shortens drying time after rain, and cuts off the debris supply that feeds moss. Note that Seattle regulates work on certain trees, so check requirements before major pruning, particularly on larger or protected specimens.
Install zinc or copper strips if moss is a recurring problem.
Take your annual photographs — roof from each elevation, attic, exterior walls. Fifteen minutes, and it is the documentation that answers a pre-existing damage argument if a storm claim ever follows.
Inspect in early autumn, clear debris twice, treat moss in the shoulder seasons, monitor through storms, and do actual work in summer. Six touchpoints a year, most of them taking under an hour, aligned to the weather that actually happens here.
This post is part of our in-depth coverage of roof inspection in Seattle.
We walk the roof, check the attic, and give you a written fixed quote. Serving Seattle and the greater Puget Sound region, open daily 7AM–8PM.
