Roofing Under the Convergence Zone
Snohomish County roofs work harder than most in western Washington, and the reason is written in the sky. When Pacific winds split around the Olympic Mountains and slam back together over the county, the Puget Sound convergence zone wrings out extra rain in a band that regularly soaks Everett, Mill Creek, Lynnwood, and the Highway 9 corridor while Seattle stays merely damp. Add windstorms funneling in off Possession Sound every fall, and a shingle here lives a harder life than the same shingle two counties south.
The housing stock compounds it. The county built out fast in the 1960s through the 80s, so a huge share of homes are ramblers and split-levels under low-pitch roofs — geometry that sheds water slowly, collects fir needles in every valley, and grows moss wherever evergreens throw shade. We spend a lot of days on exactly these roofs, from Marysville cul-de-sacs to the older blocks of Everett, and the failure patterns are consistent enough that we can usually tell the age of a roof from the street.
