What is soft wash roof cleaning?
Soft wash roof cleaning is a low-pressure method (typically under 500 PSI — about the same as a garden hose) that combines biodegradable cleaning solutions with gentle rinsing to safely remove algae, moss, lichen, mildew, and black streaks from your roof.
The cleaning solution does the work — not pressure. It penetrates organic growth and kills it at the root, which is why results last years longer than a surface-level pressure wash.
Soft wash vs. pressure washing
The Asphalt Roofing Manufacturers Association (ARMA) explicitly warns against high-pressure washing asphalt shingles — it strips the protective granules and voids most manufacturer warranties. Here's how the two methods compare:
| Soft Wash | Pressure Wash | |
|---|---|---|
| Water pressure | Under 500 PSI | 1,500 – 3,000+ PSI |
| Safe for shingles | Yes — ARMA approved | No — strips granules |
| Kills algae at root | Yes | Surface only |
| Results last | 4 – 6 years | 6 – 12 months |
| Voids roof warranty? | No | Often, yes |
Why algae, moss, and lichen damage your roof
Those black streaks aren't just cosmetic. They're a living algae (Gloeocapsa magma) that feeds on the limestone filler in asphalt shingles. Moss and lichen go a step further — their root-like structures pry shingles apart and hold moisture against the roof deck.
- Shortened roof life. Algae and moss can cut a 30-year roof down to 15–20 years.
- Higher energy bills. Dark streaks absorb heat and raise attic temperatures in summer.
- Voided warranty. Many shingle manufacturers require regular cleaning to keep warranty coverage valid.
- Curb appeal & resale. A streaked or mossy roof is one of the first things NYC home appraisers flag.
Our soft wash process
- 1. Pre-inspection
We inspect the roof, check for loose shingles, and protect landscaping, siding, and windows.
- 2. Apply biodegradable solution
A safe sodium-hypochlorite-based cleanser is applied evenly across the roof to break down algae, moss, and lichen.
- 3. Dwell time
The solution is allowed to penetrate and kill organic growth at the root — typically 15 – 30 minutes.
- 4. Low-pressure rinse
A gentle rinse washes away the dead growth and residue without disturbing shingle granules.
- 5. Gutter & downspout flush
We finish by clearing gutters and downspouts so no runoff residue is left behind.
Roof types we soft wash
The most common NYC roof type — soft washing is the manufacturer-recommended cleaning method.
Delicate materials that require zero pressure. Our low-PSI method is safe for both.
Removes oxidation staining and organic growth without stripping paint or coatings.
Common on NYC brownstones and row houses. Gentle cleaning that preserves the membrane.
Cost and how often to soft wash
Most NYC homes need a soft wash every 4 – 6 years. Homes shaded by trees, near water, or with north-facing slopes may need service more often.
- Small single-family (under 1,500 sq ft roof): typically $400 – $650
- Medium home (1,500 – 2,500 sq ft roof): typically $650 – $900
- Large / multi-family / steep pitch: typically $900 – $1,500+
- Bundle discount: save when you combine soft wash with gutter cleaning or gutter guard installation
Every job is quoted on-site — no surprise fees.
Frequently asked questions
Will soft washing damage my landscaping?
No. We pre-wet and rinse surrounding plants and tarp sensitive areas before applying any solution. Our cleansers biodegrade quickly.
How long until I see results?
Most black streaks lift immediately during the wash. Moss and lichen typically die off within 1 – 3 weeks and wash away with the next few rains.
Can I soft wash my roof myself?
We don't recommend it. Roof work in NYC involves fall hazards, chemical handling, and protecting neighboring properties. Professional soft washing is safer and typically less expensive than a hospital bill.
Do you offer soft wash roof cleaning near me?
Yes — we serve every NYC borough: Manhattan, Brooklyn, Queens, the Bronx, and Staten Island. Free on-site estimates.
Ready for a cleaner, longer-lasting roof?
Book a free on-site soft wash estimate. Bundle with gutter cleaning to save.
- Licensed & insured
- ARMA-approved method
- All 5 NYC boroughs