Roof Cleaning in Lake Oswego — Done the Way a $1M Roof Deserves

Roof Cleaning in Lake Oswego

A Lake Oswego roof has Lake Oswego problems.

Lake Oswego is a Clackamas County city of roughly 40,000 people built around a private, 405-acre lake, and its housing stock reflects it: First Addition bungalows a block off the water, Uplands and Palisades homes stacked on forested slopes above Oswego Lake, Mountain Park's 1970s cedar-and-glass architecture, and newer construction in Waluga and Bryant carrying seven-figure price tags. Nearly every one of those roofs sits under the same canopy — the city's tree cover runs close to 44%, one of the highest rates in Oregon, heavy on Douglas fir, western red cedar, and bigleaf maple. That canopy is why Lake Oswego passed one of the state's strictest tree codes, and it's also why almost every roof in town grows moss on a predictable clock.

The lake itself raises the stakes on what goes into that moss treatment. Oswego Lake is a closed, privately-owned body of water with an active watershed council tracking runoff, and a lot of downhill lots drain straight toward it or toward Lakewood Bay. Bleach and zinc strips — the shortcut most low-bid crews reach for — don't stay on the roof; they run off through gutters and downspouts and eventually reach the same watershed the city has spent years trying to protect. JNR runs an eco-friendly, US-made treatment that kills moss at the root without either one, which matters as much for a First Addition rental as it does for an Uplands home backing onto the lake.