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Kenmore Roof Black Streak Removal

Focused removal of the black gloeocapsa streaks that run down composition roofs throughout the region.

Kenmore Roof Black Streak Removal

The dark vertical streaks marring so many Northwest roofs are gloeocapsa magma, a hardy algae that clings to shingle surfaces. It spreads fastest on the shaded, moisture-retaining slopes common in our tree-lined neighborhoods. We apply a soft wash solution formulated to break the algae’s bond with the shingles and rinse it away without granule damage. The streaks disappear and the roof regains the clean, consistent look it had when it was new.

Local Service Information

Kenmore

A city at the north end of Lake Washington where the Sammamish River enters the lake.

County: King County
ZIP Codes Served: 98028
Neighborhoods: Downtown Kenmore, Inglewood, Uplake, Moorlands
Nearby Communities: Bothell, Lake Forest Park, Kirkland, Woodinville
Common Property Types: Predominantly single-family homes with townhomes and some condominiums and multifamily housing; commercial property includes retail, office, and small mixed-use buildings.
Local Tree & Landscape Notes: Common regional trees include Douglas fir, western red cedar, western hemlock, bigleaf maple, and red alder, alongside many ornamental species. Wet soils and dense canopy are common considerations for access and scheduling.
Permit Considerations: Permit requirements vary depending on tree size, species, protected areas, shoreline regulations, critical areas, and local municipal code. Always verify current requirements with the local jurisdiction before beginning work.
Climate: Marine west coast climate typical of the Puget Sound region: mild, wet winters and warm, relatively dry summers, with most rainfall from fall through spring. Occasional wind, snow, and ice events and seasonal soil saturation influence tree health and the timing of tree work.

Kenmore sits at the north end of Lake Washington in King County, from Downtown Kenmore and Uplake to the Inglewood and Moorlands neighborhoods near Log Boom Park. Lakeside humidity and abundant tree cover keep siding, roofs, and patios damp and prone to moss, algae, and mildew, the buildup our exterior-cleaning crews are brought in to wash off and keep in check.

Owners here often combine house washing, gutter clearing, and patio cleaning ahead of the wet season, and with Bothell, Lake Forest Park, Kirkland, and Woodinville nearby, we cover exterior cleaning throughout the north-lake communities.

Site Conditions: In this lakeside lowland, damp shaded air keeps green algae on siding, moss on north roof slopes, and slick film in the joints of paver patios and walkways. Leaf litter, pollen, and lake humidity settle into gutters and textured concrete, feeding the growth a soft wash addresses.
Seasonal Considerations: Summer’s drier stretch is ideal for house washing, patio cleaning, and roof treatment, while the long wet season deepens moss and algae on roofs and shaded hardscapes. We time gutter clearing before autumn leaf fall and keep soft-wash appointments to dry, settled days.
Common Project Types: Common jobs include house soft washing, driveway and patio pressure cleaning, deck and fence brightening, and roof and gutter clearing, with moss and algae removal frequent on the shaded lots near Log Boom Park and the lake.
Property Styles: Properties range from single-family homes to townhomes and condos, with vinyl and painted siding, composition roofs, and concrete or paver drives and patios that each call for a gentler, surface-specific cleaning approach.
Local Materials & Plants: Crews clean vinyl and painted siding, composition roofing, concrete flatwork, and paver patios, all prone to green algae, roof streaking, moss, lichen, mildew, and the pollen film that coats these shaded lakeside lots each spring.
Planning Your Project: Planning follows dry-weather windows, protects landscaping with pre-wetting and covers, and keeps runoff away from the Lake Washington shoreline. General permit and notice requirements are confirmed before cleaning starts.

If lakeside shade and humidity leave your Kenmore home mossy and streaked, reach out to design a house wash and patio-cleaning plan for your property.

Benefits

Erases distracting black streaks that lower curb appeal; Preserves shingle integrity by avoiding harsh pressure; Extends the visual life of the roof between replacements; Reduces the algae reservoir that spreads to neighboring surfaces

Process

1) Confirm the staining is gloeocapsa algae and map affected areas; 2) Wet down and shield surrounding plants and fixtures; 3) Apply the streak-dissolving treatment to stained slopes; 4) Rinse lightly and verify complete streak removal

Ready to get started?

Get a streak removal estimate and bring back the clean look of your rooftop.
Call: 425-390-8500