Those black streaks are algae eating the limestone filler in your shingles. We kill it with an ARMA-approved soft wash — no pressure on the roof, no lost granules, no voided warranty.
Serving
Glenmont, NY
Roof Washing in Glenmont
Black streaking on a Glenmont roof is Gloeocapsa magma, a hardy algae that feeds on the limestone filler in asphalt shingles. It starts on the shaded slope and spreads across the whole roof over a few seasons.
River fog rolling up over Henry Hudson Park and the bluffs keeps Glenmont rooflines damp into the morning, which is why algae streaks and moss show up here faster than a few miles inland.
Pressure washing a roof strips granules and shortens its life. We use the low-pressure soft wash the shingle manufacturers actually recommend: apply, dwell, rinse gently. Streaks are gone the same day and stay gone for years.
Local Conditions
Humid summers, wet falls, and long shaded stretches give algae everything it needs. Add tree cover and slow-drying north slopes and most roofs here start showing streaks somewhere between year six and year ten.
The plane with the least sun stays damp longest and streaks first, every time.
Tree cover across Glenmont drops debris into valleys and blocks the sun that would dry the shingles.
Debris collects where water concentrates, giving algae and moss organic matter to root into.
Anything holding water against shingles gets pried apart repeatedly between November and April.
Why It Matters
The low-pressure soft wash asphalt shingle manufacturers specify — your warranty stays intact.
Algae staining lifts as the solution works. You see the difference before we pack up.
Both are treated at the root and release naturally over the following weeks — never scraped.
No pressure ever touches the shingle, so the protective granules stay where they belong.
Landscaping and siding pre-soaked and rinsed; downspout runoff managed throughout.
Measured from satellite imagery or on-site and priced flat for your Glenmont roof.
See Us In Action
This is what we do every day across the Capital Region. Real homes, real crews, real results. No stock photos, no gimmicks — just a clean job done right.
Our Process
We identify algae, moss, or lichen — each needs different dwell time and solution strength.
A flat price in writing, usually same day. On-site quotes any time you'd rather we walk it.
Landscaping, lawn, and hardscape soaked with fresh water and covered where needed.
ARMA-approved solution applied at rinse pressure and given the time it needs to kill through.
Low-pressure rinse of roof, siding, and windows. No pressure washing on the shingles.
Runoff debris flushed out of gutters and downspouts, then a walkthrough with you.
Real Results
What Customers Say
“I just want to thank Capital Pro for doing such a phenomenal job power washing my house. It's like I have a new house! I would recommend them to anyone. And the workers are there to please you. Cause they care!”
Kathy Valason
Google Review · a month ago
“The guys did a great job and the house looks beautiful. My sister drove by and said the same thing — it looks beautiful. They were so nice to talk to and deal with. I have recommended them to my family and friends.”
Leslie Kaufman
Google Review · 3 weeks ago
“In a state of bereavement we reached out and got an earlier date. When we returned from funeral proceedings the house was impeccable. Even areas we had no time to prep for were done. Nice work for sure. Call them — you won't be disappointed!”
Islah Umar
Google Review · 3 weeks ago
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Neighborhoods We Serve
Glenmont FAQ
Nearby Towns We Also Serve
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The full soft-wash roof cleaning method explained.
Same organism on the siding — bundle both in one visit.
Clear the debris the roof sheds during the wash.
Homeowner Guides
What roof cleaning actually costs in Albany and the Capital Region, the four things that set the price, and how to tell a real quote from a lowball.
Why Are There Black Streaks on My Roof? (Albany NY Roof Cleaning Guide)Those black streaks on an Albany-area roof are algae, not dirt. What causes them and how soft washing removes them safely.
Soft Wash vs. Pressure Wash: Which Does Your Capital Region Home Need?Soft washing and pressure washing aren't interchangeable. Learn the real differences, which surfaces need which method, and how to avoid costly damage.
