High pressure washing strips granules from composition shingles and voids many manufacturer warranties. We use low-pressure soft washing instead, which lifts moss, algae, and lichen without damaging the roofing surface. It is the recommended approach for the older roofs common across Gregory Heights and Boulevard Park.

Burien sits in a marine climate with heavy winter rain, frequent overcast days, and tree-shaded lots. Those conditions keep roofs damp for months, and shaded north slopes rarely dry out fully. That standing moisture is exactly what moss, algae, and lichen need to take hold and spread across the shingles.

We use a combination approach. Loose moss is gently removed by hand or with soft tools, then we apply a treatment that kills remaining spores at the root. This prevents quick regrowth far better than scraping alone, which is important given how fast moss returns in the South King County climate.

We protect plants, downspouts, and surrounding surfaces before any treatment begins. Runoff is managed carefully and we rinse foliage as needed. Our soft washing solutions break down safely, so your landscaping around the home stays healthy throughout the Burien rainy season and beyond.

Yes. Moss holds moisture against shingles and lifts their edges, which leads to early failure and leaks. Removing it and treating for regrowth helps a Burien roof reach its full lifespan. Regular maintenance is one of the most cost-effective ways to protect your home in this wet region.