Roof Cleaning in Chatham, NJ
Low-pressure soft wash that lifts black streaks, moss & algae without touching your shingles.
Roof Cleaning in Chatham, NJ — Soft Wash That Won't Void Your Shingle Warranty
Drive the older streets off Fairmount Avenue in Chatham Borough and you'll see the same thing on a lot of roofs: dark streaks running down the north and east slopes. That's Gloeocapsa magma — the algae that feeds on the limestone filler in asphalt shingles. It shows up worst here because so many of these lots sit under mature oak and maple canopy, so the shaded faces of the roof stay damp long after a summer storm passes.
We don't pressure wash roofs. On the brick colonials and cedar-shake homes common through the borough and out toward Chatham Township, high pressure blasts the protective granules off asphalt and drives water under shakes. We soft wash — a low-pressure application that kills the algae, moss, and lichen at the root and rinses it away without touching the shingle surface.
North Jersey's humid summers and freeze-thaw winters make this a maintenance item, not a one-time fix. Moss especially likes the dormer valleys and low-slope sections on Chatham's older homes, where leaf litter and moisture collect. Left alone, that growth holds water against the roof deck and shortens its life.
- Local crew that knows Chatham homes
- Soft-wash & low-pressure methods that protect your surfaces
- Licensed, insured & background-checked
- Upfront pricing — same-week scheduling
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What neighbors say
5.0 · 854+ Google reviews“Absolutely outstanding job by the Galo Brothers today power washing our house! Honestly the best power washing job we have ever had done. The house looks brand new again, every detail was handled with care, and the difference is unbelievable. They were professional, thorough, hardworking, and took real pride in their work. It’s rare these days to find a company that exceeds expectations, but they absolutely did. Highly, highly recommend the Galo Brothers to anyone looking for top notch service and incredible results!”
Bruce Bosland
“Gallo Bros powerwashing team headed up by Joe, did a great job on our exposed, lakefront home. They went above and beyond to remove dirt and mildew from our house siding, soffits and multiple bluestone patios and walkways, as well as our dock and wood furniture. They also took great care to avoid or work around multiple bird nests which had recently hatched babies pre fledge. I will definitely call them in the future!”
Cathy Marshall
“We hired Gallo Bros Power Washing to power wash, re-sand and seal our 20 year old paver patio and front walk. They also performed a few repairs and reset a few areas that needed attention. We had never had this done professionally before. From the beginning estimating phase to the final coat of sealer, we were very happy with the services provided, the price and the final result, which they also warrantee for 1 year. I highly recommend Gallo Bros. Power Washing and will use them for other services in the future.”
Andrew O
Roof Cleaning in Chatham — FAQ
Will soft washing damage my asphalt shingles or void the warranty?
No. Manufacturers like GAF and the roofing trade association (ARMA) specifically warn against pressure washing and recommend low-pressure cleaning with the right solution — which is exactly what soft washing is. On the asphalt roofs common across Chatham, we apply the treatment, let it dwell, and rinse gently. Nothing scours the granules off.
Why does my roof streak on one side and not the other?
The dark streaks almost always start on north- and east-facing slopes because they get the least sun and stay damp longest — a real problem on Chatham's tree-shaded lots. The algae needs moisture to grow. The sunnier south face dries out faster, so it usually stays cleaner. We treat the whole roof so it doesn't come right back on the shaded side.
How long before the algae and moss come back after cleaning?
Depends on how much canopy is over the house. On heavily shaded lots in the older sections of the borough, you may see growth returning in a few years; on more open lots it can go longer. Keeping gutters clear of oak and maple leaf load helps, since standing debris keeps the roof edge wet. We can walk you through realistic timing for your specific roof when we quote it.
How much does roof cleaning cost in NJ?
It ranges widely — from a few hundred dollars for a small ranch to several thousand for a large, steep or complex roof. Size, pitch, material, access and how much algae has built up all factor in. You get a firm price up front, free.
Will roof cleaning damage my shingles?
No. We soft wash with low pressure and a cleaning solution — the method asphalt-shingle makers recommend. High-pressure washing is what damages roofs; we never do that on a roof.
What are the black streaks on my roof?
That's a hardy algae called Gloeocapsa magma. It feeds on the limestone in your shingles and spreads in New Jersey's humidity. Soft washing kills it at the root, not just the surface.
How long does a roof cleaning last?
Usually 2–4 years. Because soft washing kills the algae instead of just rinsing it, the clean lasts far longer than a quick power-rinse.
North Jersey · 854+ five-star reviews
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- A real person comes out and prices the work in front of you
- Exact price before anything starts, in writing
- Free, and there's no obligation to book the job
Rather talk it through?
(973) 500-8155info@gallobrospw.com