Safe, manufacturer-approved moss treatment for Pacific Northwest roofs. Soft-wash methods, zinc strip prevention, and no pressure-washing damage.
Get Free EstimateIf you live in Kirkland, Bothell, Kenmore, or anywhere in King County, you've seen the green creep on neighborhood roofs. Our climate makes moss almost inevitable — but the damage it does isn't.
Moss roots into the seams between asphalt shingles and traps moisture against the surface. Over time, that moisture rots decking, lifts shingle edges, and accelerates granule loss. The result: premature roof failure 5–15 years earlier than you'd expect.
Free roof assessment to identify moss type, severity, and any underlying damage.
Manufacturer-approved chemical treatment that kills moss, algae, and lichen at the root — no pressure washing.
Optional zinc or copper strips at the ridge that release ions during rain to prevent regrowth for years.
Kirkland's wet Pacific Northwest climate — heavy rain, mild temperatures, and tree shade — creates ideal conditions for moss, algae, and lichen growth on roofs.
Yes. Moss holds moisture against shingles, lifts and breaks edges, and accelerates granule loss. Left untreated, it can shorten roof life by 5–15 years.
Most residential roof moss treatments in Kirkland range from $400–$1,200 depending on roof size, pitch, severity, and whether zinc strips are installed.
Yes — high-pressure washing strips granules and voids most shingle warranties. We use a soft-wash chemical treatment that kills moss without damaging the roof.
A proper moss treatment with zinc strip installation typically prevents regrowth for 4–8 years in the PNW climate.
Late spring through early fall, when the roof can dry. Treatment in dry weather is most effective.
Free, no-obligation estimate. Local Kirkland roofers since 2018.