Roof Algae Treatment

What This Service Involves

Those black stains creeping down Washington roofs are colonies of gloeocapsa algae feeding on the limestone filler in asphalt shingles. Our treatment kills the algae and lifts the discoloration, restoring an even appearance while halting further spread. Because the region's humidity keeps roofs damp for much of the year, treated surfaces benefit from solutions formulated to resist quick recolonization. Homeowners on the wetter west side of the Sound frequently see algae return between full cleanings, making targeted treatment a practical maintenance step.

Benefits

Removes black algae streaks and restores color; Stops algae from consuming shingle filler material; Slows recolonization in humid Northwest conditions; Improves curb appeal without harsh scrubbing; Complements broader roof cleaning efforts

Our Process

1) Inspect the roof and confirm algae as the cause of staining; 2) Apply an algae-killing solution to the streaked areas; 3) Allow the treatment to break down the growth; 4) Rinse gently and verify the surface is clean

What Affects the Cost

Roof area affected by algae; Intensity and age of the staining; Shingle type and porosity; Amount of shade and moisture exposure; Roof pitch and access requirements

Best Time of Year

Treat algae during dry, mild weather so the solution can work fully before rainfall dilutes it.