Moss Treatment
Low pressure kill and clear plus preventative to stop regrowth.
Nothing shortens a Seattle roof's life like moss. It roots between the shingles, lifts them, traps moisture against the deck and holds it there through every rainy month, which is most of them. Left alone, it turns a 25-year roof into a 15-year roof.
Here's the part people get wrong: you must never pressure wash a composite shingle roof. High pressure blasts off the protective granules and voids most warranties. We soft wash instead, a gentle, low pressure treatment that kills the moss and algae at the root, then we brush away the debris by hand and apply a preventative treatment so it stays clear far longer. Your shingles are protected, and your roof lasts the years you paid for.
Low pressure kill and clear plus preventative to stop regrowth.
Do the walls the same day the roof gets done.
Learn moreRoof debris ends up in the gutters, clear both together.
Learn moreTwo add-ons that make a roof cleaning go further.
After removal we apply a gentle treatment that stops regrowth at the spore level — essential in the Pacific Northwest. Annual applications keep your roof moss-free year after year.
Grime and algae cleared from skylights so natural light pours through again, with a seal check while we're up there. Easy to bundle with any roof or gutter service.
Yes, high pressure strips the protective granules off composite shingles and can void your warranty. That's exactly why we soft wash: low pressure and a moss killing treatment that cleans without harming the roof.
In our wet climate we recommend a professional roof cleaning and moss treatment every 2-3 years. Homes under heavy tree cover may need it sooner.
Yes. After we kill and clear the moss we apply a preventative treatment, and we can set up periodic maintenance so it never gets a foothold again.
The price depends on your roof size, pitch, and how much moss has built up. We quote it free after a quick look or a couple photos. Call (425) 250-9807 for a fast, free quote.
Free quotes, fast answers, and a real person on the other end.