What Is Roof Cleaning and Moss Removal?
Roof cleaning and moss removal clears biological growth — moss, Gloeocapsa magma algae, and lichen — from a roof with a low-pressure chemical wash that kills the growth at the root. It relies on chemical action rather than pressure washing, which strips the protective granules.
What Roof Cleaning and Moss Removal Do We Provide?

Newark Quality Roofing removes 3 biological growths from roofs across Essex County: moss, Gloeocapsa magma algae, and lichen — for residential and commercial properties. Roof cleaning applies a chemical wash at low pressure to kill the growth at the root and rinses the dead material away without stripping the protective granules.
A Newark Quality Roofing roof cleaning uses a low-pressure chemical method, because ARMA states that pressure-washing an asphalt shingle roof causes granule loss and premature failure of the roof system. ARMA specifies a 50:50 mix of laundry-strength liquid chlorine bleach and water, a 15–20-minute dwell, and a low-pressure rinse, so a Newark Quality Roofing wash relies on chemical action rather than mechanical force across Essex County.
- Moss removal — Moss removal clears the thick green growth from shingle edges, valleys, and shaded north-facing slopes, because ARMA states that moss lifts and curls the leading edges of shingles and raises the risk of shingle blow-off during wind events.
- Algae streak removal — Algae streak removal clears the dark streaking caused by Gloeocapsa magma, the most prevalent roof-discoloration algae, which feeds on the limestone filler in asphalt shingles, per ARMA and Atlas Roofing.
- Lichen removal — Lichen removal clears the crusty grey-green patches that adhere to shaded shingle surfaces, applying the ARMA 50:50 chlorine-bleach-and-water solution at a 15–20-minute dwell to penetrate the growth to the root.
- Soft-wash low-pressure roof cleaning — Soft-wash low-pressure roof cleaning applies the cleaning solution and a low-pressure rinse rather than a pressure washer, because ARMA states that pressure-washing an asphalt shingle roof causes granule loss and premature failure of the roof system.
- Algae and moss prevention treatment — Algae and moss prevention treatment slows regrowth after a cleaning, because proper maintenance extends asphalt-shingle service life by roughly 25–30%, per ARMA, with the prevention-treatment cost range named in the cost section, per This Old House.
- Commercial low-slope roof cleaning — Commercial low-slope roof cleaning matches the chemistry and rinse to EPDM, TPO, and modified-bitumen membranes, managing drainage during the rinse so cleaning solution does not pond on the low-slope membrane.
How Do You Know If You Need Roof Cleaning and Moss Removal?




- Thick green moss along shingle edges, in valleys, and on north-facing slopes lifts and curls the shingle leading edges and raises the risk of wind blow-off, per ARMA, because shaded north-facing slopes hold moisture and degrade faster, per CSSB and NRCA guidance.
- Dark black or green streaking across the roof surface indicates Gloeocapsa magma, the most prevalent roof-discoloration algae, which feeds on the limestone filler in asphalt shingles, per ARMA and Atlas Roofing.
- Crusty grey-green lichen patches adhered to the shingle surface establish in shaded, moisture-holding areas and require the ARMA 50:50 chlorine-bleach-and-water solution at a 15–20-minute dwell to reach the root.
- Granule loss with sandy grit in gutters under the streaked areas indicates accelerated wear, because granule loss exceeding roughly 30% of the surface is the common rule-of-thumb for beyond repair, per GAF and InterNACHI.
- Leaf litter and organic debris in valleys and at roof-to-wall transitions create the moisture-holding, nutrient-rich conditions where moss colonies establish, per ARMA algae-and-moss guidance.
- Severe moss build-up across the field causes lateral water movement that reaches the roof deck and leads to moisture damage or leaks, per ARMA.
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How Do Our Roofing Contractors Perform Roof Cleaning and Moss Removal?

Newark Quality Roofing contractors clean a roof with a low-pressure chemical wash, not a pressure washer, because ARMA states that pressure-washing an asphalt shingle roof causes granule loss and premature failure of the roof system. A Newark Quality Roofing wash applies the ARMA 50:50 mix of laundry-strength liquid chlorine bleach and water, holds the solution on the surface for the 15–20-minute dwell ARMA specifies, and finishes with a low-pressure rinse, so the cleaning relies on chemical action that kills moss, Gloeocapsa magma algae, and lichen at the root. Heavy moss is removed by hand before the wash, because moss lifts and curls the shingle leading edges, per ARMA.
Newark Quality Roofing recommends preventive measures after a cleaning, because proper maintenance extends asphalt-shingle service life by roughly 25–30%, per ARMA. Zinc and copper metal molecules inhibit algae growth, per ARMA and Atlas Roofing, so manufacturers build copper granules into algae-resistant shingles. ARMA states that adding zinc or copper strips to an existing roof is not recommended, because the strips require exposed nails that cause leaks over time or break the sealant bond, so Newark Quality Roofing reserves strip installation for a roof replacement and prevents regrowth on an existing roof with a maintenance wash.
What Residential Roof Cleaning and Moss Removal Do We Provide?
Newark Quality Roofing cleans residential roofs across Essex County, removing moss, Gloeocapsa magma algae, and lichen from asphalt shingles, slate, tile, and metal with a low-pressure ARMA-specification wash. A roof-covering cleaning of a detached one- and two-family home counts as ordinary maintenance under N.J.A.C. 5:23-2.7 and requires no construction permit, no inspection, and no notice to the construction official, per the NJ Uniform Construction Code.
A Newark Quality Roofing cleaning protects shingle granules, because ARMA states that pressure-washing an asphalt shingle roof causes granule loss, and granule loss exceeding roughly 30% of the surface is the common rule-of-thumb for beyond repair, per GAF and InterNACHI. North-facing and shaded Essex County slopes hold moisture and grow moss faster, per CSSB and NRCA guidance, so a Newark Quality Roofing cleaning targets the shaded slopes first.

What Commercial Roof Cleaning and Moss Removal Do We Provide?
Newark Quality Roofing cleans commercial low-slope roofs across Essex County, matching the cleaning chemistry and rinse to EPDM rubber, TPO, and modified-bitumen membranes and managing drainage so cleaning solution does not pond on the membrane. EPDM lasts 15–25 years, TPO 7–20 years, and modified bitumen 20 years, per the InterNACHI life-expectancy chart, and biological growth that holds moisture against the membrane accelerates the deterioration.
Ponding water remaining on a low-slope roof more than 48 hours counts as a defect, and a flat roof needs at least ¼ inch per foot of slope to drain, per the NRCA and ARMA, so a Newark Quality Roofing crew clears the drains during the rinse. A Newark Quality Roofing commercial cleaning pairs with an inspection that follows the NRCA cadence of twice per year, spring and fall, plus an inspection after any major weather event.

What Are the Steps in Our Roof Cleaning and Moss Removal Process?

- Pre-Cleaning Assessment
A Newark Quality Roofing technician identifies the growth as moss, Gloeocapsa magma algae, or lichen, rates the roof-covering condition, and sets the cleaning chemistry, because granule loss exceeding roughly 30% of the surface marks a roof beyond cleaning, per GAF and InterNACHI.
- Property and Landscape Protection
A Newark Quality Roofing crew pre-wets and covers plantings beneath the roof edge before applying the ARMA chlorine-bleach-and-water solution, because the solution is laundry-strength bleach at a 50:50 mix, per ARMA.
- Manual Moss Removal
A Newark Quality Roofing crew removes heavy moss by hand before the wash, because moss lifts and curls the leading edges of shingles and raises the risk of shingle blow-off during wind events, per ARMA.
- Low-Pressure Chemical Wash
A Newark Quality Roofing crew applies the ARMA 50:50 laundry-strength chlorine-bleach-and-water solution and holds the solution on the surface for the 15–20-minute dwell ARMA specifies, working from ridge to eave for full coverage.
- Low-Pressure Rinse
A Newark Quality Roofing crew rinses with low-pressure water that carries away the dead growth, because ARMA states that pressure-washing an asphalt shingle roof causes granule loss and premature failure of the roof system.
- Prevention and Recommendations
A Newark Quality Roofing lead recommends a maintenance schedule and, at a roof replacement, copper or zinc strips, because proper maintenance extends asphalt-shingle service life by roughly 25–30%, per ARMA, and ARMA does not recommend adding strips to an existing roof.
How Much Does Roof Cleaning and Moss Removal Cost?
Roof Cleaning and Moss Removal cost in Essex County, NJ runs $300–$1,050 for most cleanings, with the cost factors below setting where a given job lands in that range.
Typical Price Range
$300–$1,050 for most cleanings
Cost Factors:
- Roof cleaning costs $300–$1,050, an average of $675 for a 1,500-square-foot home, per This Old House cost data.
- Soft-wash cleaning costs $0.20–$0.70 per square foot, and moss removal is included in most basic cleanings at the same per-square-foot rate, per This Old House.
- A moss-prevention treatment after a cleaning costs $150–$250, per This Old House.
- Zinc applied as strips or powder costs $0.05–$0.15 per square foot at a roof replacement, because ARMA does not recommend adding strips to an existing roof.
- North-facing and shaded slopes with heavy moss requiring hand removal sit at the higher end of the range, because shaded slopes hold moisture and grow moss faster, per CSSB and NRCA guidance.
A free written estimate confirms the exact figure for a specific roof before any work begins.

Why Choose Our Roofing Company for Roof Cleaning and Moss Removal?
Newark Quality Roofing holds New Jersey Home Improvement Contractor registration, the credential the NJ Division of Consumer Affairs requires of every NJ roofing contractor.
Newark Quality Roofing cleans with the ARMA-specified 50:50 chlorine-bleach-and-water solution and a low-pressure rinse, because ARMA states that pressure-washing an asphalt shingle roof causes granule loss and premature failure.
Newark Quality Roofing provides free roof inspections that identify moss, Gloeocapsa magma algae, or lichen and rate the roof-covering condition before a cleaning quote.
Newark Quality Roofing cleans residential and commercial roofs across Essex County, covering Newark, East Orange, Bloomfield, Montclair, Belleville, and Irvington, Monday–Friday 7:00 AM–6:00 PM and Saturday 8:00 AM–2:00 PM.
What Questions Do Customers Ask About Roof Cleaning and Moss Removal?
Does pressure washing damage roof shingles in Newark or Essex County?
What removes the dark streaks on a roof in Essex County, NJ?
Does moss cause roof leaks?
Do zinc or copper strips prevent roof moss and algae?
How much does roof cleaning and moss removal cost in Essex County, NJ?
How often does a roof need cleaning in New Jersey?
What Knowledge Base Articles Explain This Service?
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