Professional roof cleaning for asphalt shingles, cedar shake, slate, tile, and metal roofs across Haverhill, MA and Southern NH. ARMA-approved soft wash removes black streaks, moss, and algae safely.
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The black streaks running down your roof aren't dirt — they're Gloeocapsa magma, a cyanobacterium that feeds on the limestone filler in asphalt shingles. Once it takes hold, it spreads across the entire roof face within a few seasons. In Haverhill and the Merrimack Valley, the combination of humidity, shade from mature trees, and coastal moisture creates ideal conditions for this organism to thrive. The damage goes beyond appearance. Gloeocapsa magma and moss retain moisture against the shingle surface, accelerating granule loss and weakening the shingle's UV protection. Untreated roofs lose an estimated 5-10 years of useful life compared to roofs that are cleaned regularly. Moss is even more destructive — it lifts shingle edges and allows water to penetrate underneath, leading to leaks and wood rot in the decking. A professional roof cleaning service is the most cost-effective way to protect what is typically a $10,000-$25,000 investment. At Action Pressure Washing, we use the ARMA-approved soft wash method to kill algae and moss at the root without damaging your shingles. Our roof cleaning contractors have cleaned hundreds of roofs across Haverhill, Methuen, Salem, Plaistow, and surrounding towns.
How we get the job done right
We assess your roof from the ground and ladder points to identify the roofing material, the extent of algae and moss growth, and any areas requiring special attention — all without walking on your shingles.
We thoroughly pre-wet all landscaping, cover sensitive plants, and rinse gutters. Your gardens, shrubs, and lawn are protected before any cleaning solution is applied.
Our ARMA-approved cleaning solution — a carefully measured sodium hypochlorite and surfactant blend — is applied at low pressure from the ground or ladder. It kills Gloeocapsa magma algae and moss at the cellular level.
The solution dwells on the roof for 15-20 minutes, penetrating the root systems of algae, moss, and lichen. This dwell period is what makes soft washing more effective than surface-level rinsing.
We rinse the roof with controlled low pressure — well under the threshold that could damage shingles, lift granules, or void warranties. Heavy moss may take 1-2 rain cycles to fully release.
We inspect the roof from multiple angles to confirm full coverage, then give all surrounding landscaping a final freshwater rinse as an extra precaution.
Not every roof is the same, and tile roof cleaning services that blast everything with high pressure cause expensive damage. Asphalt and architectural shingles are the most common roofing in the Merrimack Valley — they're designed to shed water, not withstand 3,000 PSI blasts. High pressure strips the protective granule layer, voids manufacturer warranties, and can crack aged shingles. Our soft wash uses zero high-pressure contact with the roof surface. Cedar shake roofs require a milder solution concentration to avoid bleaching the wood. Slate is extremely durable but brittle — we never walk on slate and use gentle application from ladder positions. Clay and concrete tile roofs are common on Mediterranean-style homes and can crack under foot traffic or direct pressure. Metal roofs are the easiest to clean but still benefit from our soft wash approach to avoid scratching the painted finish. Whatever your roof material, Action Pressure Washing is the roof cleaning company homeowners trust for safe, warranty-compliant results. We also pair roof cleaning with house washing and gutter cleaning for a complete exterior transformation.
Why choose us for roof cleaning
Those dark streaks are Gloeocapsa magma — a cyanobacterium that feeds on limestone filler in shingles. Our soft wash kills it at the root and restores your roof's original color.
Untreated algae and moss shorten shingle lifespan by 5-10 years. Professional roof cleaning removes the organisms causing premature granule loss and decay.
The Asphalt Roofing Manufacturers Association recommends soft washing as the only safe cleaning method for asphalt shingles. We follow their guidelines exactly.
We clean from the ground and ladder positions using professional-grade equipment. No foot traffic on your shingles means no risk of cracking or displacing tiles.
We clean asphalt shingles, architectural shingles, cedar shake, slate, tile, and metal roofs — adjusting our solution concentration and technique for each material.
Action Pressure Washing is fully insured with general liability coverage, based in Haverhill, MA, and has cleaned roofs across the Merrimack Valley and Southern NH for years.
We provide free, no-obligation estimates for every roof cleaning job. Here are typical price ranges for the Haverhill and Merrimack Valley area: - **Ranch / small roof** (under 1,500 sq ft): $450 - $650 - **2-story standard**: $650 - $950 - **Large or complex roof**: $950 - $1,800 **Common add-ons:** - Gutter brightening: +$150 - $300 - Soffit and fascia cleaning: +$200 - $400 Factors that affect your final price include total roof area, pitch and accessibility, number of stories, severity of algae and moss growth, and roof material. Cedar shake and tile roofs require additional care and are priced accordingly. Roofs with heavy moss buildup may require a follow-up treatment. Want an exact number? Call (978) 471-4148 or fill out our online form for a free estimate. We typically respond within a few hours. Roof cleaning is our highest-value service — for a fraction of replacement cost, you can add years of life to your existing roof.
Action Pressure Washing is based in Haverhill, MA and provides professional roof cleaning services throughout the Merrimack Valley and Southern New Hampshire. Our crews clean roofs in Methuen, MA, Andover, MA, North Andover, MA, and Dracut, MA on the Massachusetts side. Across the border we serve Salem, NH, Plaistow, NH, Windham, NH, Pelham, NH, Derry, NH, Atkinson, NH, Hampstead, NH, Newton, NH, Kingston, NH, and Sandown, NH.
Whether you need a standalone roof cleaning or a full exterior package including house washing, driveway cleaning, and deck cleaning, we handle it all with the same attention to detail. Homeowners searching for a roof cleaning company or roof cleaning services near the Boston North Shore will find that our service area reaches from the New Hampshire border south through the greater Boston corridor. We are a fully insured, locally owned roof cleaning company — not a franchise, not a subcontractor.
Every roof we clean gets a custom approach based on material, pitch, growth severity, and accessibility. We don't cut corners, we don't walk on your shingles, and we don't use pressure that damages your roof. Our roof cleaning service has earned repeat customers in every town we serve because we deliver results that last years, not weeks.
Call (978) 471-4148 or request your free estimate online. We typically respond within a few hours.
The Asphalt Roofing Manufacturers Association (ARMA) is the industry body that sets standards for asphalt shingle care. Their official recommendation is clear: soft washing with a sodium hypochlorite and water solution is the only approved method for cleaning asphalt shingles. Pressure washing — even at "moderate" PSI — strips the granule layer that protects shingles from UV radiation and weather damage. Once those granules are gone, shingles age rapidly and warranties are voided.
Our soft wash process follows ARMA guidelines exactly. We apply a measured sodium hypochlorite and surfactant blend at pressures comparable to a garden hose. The surfactant helps the solution cling to the roof surface and penetrate the root systems of Gloeocapsa magma algae, moss, and lichen. After dwelling for 15-20 minutes, the solution is gently rinsed. The result is a chemical clean — not a mechanical one — that kills growth at the cellular level without touching the granule layer. Heavy moss may take one or two rain cycles to fully release from the surface after treatment, but the organism is dead and will not regrow. For homeowners in Massachusetts and New Hampshire looking for a professional roof cleaning service that protects their investment, ARMA-approved soft washing is the only responsible choice.
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Family-owned, fully insured, and committed to your satisfaction.
Real reviews from real customers
Clearly knew and saw what had to be done and found the best way to do it. Excellent communication and no hassle. Incredibly fortunate to have found this service.
