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Roof soft washing
Black streaks, moss and lichen removed from shingle roofs with a soft wash, never high pressure.
About the job
The black streaks running down many roofs are an algae called Gloeocapsa magma. It spreads from roof to roof, holds moisture and makes shingles look years older. Moss and lichen grow on shaded slopes and can lift shingle edges over time.
Asphalt shingle makers recommend against pressure washing, because high pressure strips the granules that protect the shingle. We brush off thick moss by hand, apply the cleaning solution at low pressure and let it work. Most streaks are gone the same day. Dead moss and lichen let go over the next few weeks of rain.
What’s included
Black algae streaks, moss and lichen treated
Thick moss brushed off by hand first
Low-pressure application, no blasting
Plants and lawn under the roof edge kept wet
Ground around the downspouts rinsed
Before and after photos of each side of the roof
Common questions
Will washing damage my shingles?
Not the way we do it. High pressure knocks off the granules that protect asphalt shingles, which is why shingle makers warn against it. We apply the cleaner at low pressure, close to a garden hose, and never point a pressure wand at your roof.
How long does a clean roof stay clean?
Usually 3 to 5 years (example). Roofs in full sun stay clean longer. Shaded slopes and roofs under trees get streaks back sooner.
What about the plants below the roof?
We wet the beds and shrubs before we start and keep them wet while we work. The runoff comes down through the downspouts, so we rinse the ground there too. Tell us about anything delicate and we’ll cover it.
Starting price
From $499 (example)
Half a day
Soft wash: low pressure, safe for paint and shingles.
Fully insured, written price before we start (example).
Prices are examples. Set your own with the estimate.