Zinc strips
Zinc or copper strips can be installed near the ridge after the roof is cleaned.
Exterior Services
Roof Cleaning Garfield, NJ
A roofer in Garfield can clean black algae streaks, lichen and grime off a roof using a low-pressure soft wash that does not strip shingle granules, and check the roof for damage hidden under the grime. Dial (551) 348-2856 to talk with a local roofer about cleaning your roof.
Dark streaks on a roof are usually a type of airborne algae, often called Gloeocapsa magma, that feeds on the limestone filler in many asphalt shingles. The algae builds a dark protective coating that absorbs sunlight, which is why the streaks look black and grow down the slope where water runs. Algae on its own is mainly cosmetic, though it often travels with lichen and moss, which hold water and work under the shingle edges.
How the roof is cleaned matters more than how clean it looks afterward. Pressure washing blasts the protective granules off asphalt shingles, can force water under the laps and can crack tile or slate, so roofers avoid it on most roofs. A soft wash applies a cleaning solution at low pressure, gives it time to work and rinses gently, which kills the growth at the root without scouring the surface.
Some quick observations make the first conversation easier. Note whether the stains are black streaks, green patches, gray or crusty spots of lichen, or clumps of moss, and which slopes they cover. Say whether the roof is asphalt, tile, metal or wood, and what is planted along the house.
Roof Cleaning is often paired with roof moss removal and gutter cleaning, depending on the cause.
Dealing with this in Garfield, NJ right now? Call (551) 348-2856 to talk to a local roofer.
Call nowThe process
What happens during a roof cleaning
Good roof cleaning is gentle on the roof and careful with everything below it.
Check the surface
The roofer checks the roof material, the type of growth and the condition of the shingles, flashing and vents before cleaning. Problems hidden under the grime often show up here.
Prepare the site
The crew wets down plants and grass and moves outdoor furniture away from the walls. Downspouts may be diverted so runoff does not pool in garden beds.
Treat the roof
A low-pressure sprayer applies the solution evenly, letting it soak in to kill the growth. Shingles, tile and metal each get a solution suited to them.
Rinse gently
Debris on the roof and in the gutters is removed, and the roof is rinsed lightly. Some stains keep fading over the following weeks as rain finishes the job.
Clean up below
Plants, siding and walkways are rinsed again with clean water, and the roof is checked one last time. The roofer notes any shingles or flashing that need repair.
What is included
What roof cleaning covers
Valley clearing
Built-up debris is swept off the roof before it holds moisture.
Lichen removal
Lichen spots are killed at the root then wash away over time.
Tile roof cleaning
Concrete and clay tile roofs are cleaned with care to avoid cracking with solutions safe for metal finishes.
Algae streak removal
Black algae streaks are removed with a low-pressure soft wash so the roof color comes back.
Related service
Roof Soft Wash Garfield, NJ
A roof soft wash cleans the roof with a solution and low-pressure spray instead of a high-pressure stream. The cleaning mix breaks down the growth and its root structure, not just the visible stain. Killing the growth at the root slows how fast it returns.
In Garfield, a soft wash is the safe choice for asphalt shingle roofs with algae streaks. Plants and grass are watered ahead of time and rinsed again afterward so the runoff is diluted. Results show quickly on algae, while lichen releases more slowly.
Related service
Roof Cleaning Service Garfield, NJ
Hiring a roof cleaning service means the work is done with proper safety gear and the right solution for your roof. A wet, treated roof is extremely slippery, which is why roof cleaning is not a good do-it-yourself job. A roofer also brings the advantage of spotting damage, like lifted shingles or worn flashing, while the roof is clean.
For Garfield homes, it often makes sense to clean the gutters right after the roof. Zinc or copper strips installed near the ridge help slow regrowth, as rain washes metal ions down the roof. More sun and air on the roof means less growth.
Local help
Roof Cleaning Near Me
Around Garfield, most roof cleaning requests start with dark algae streaks on the shaded side of the house. Across Garfield and nearby communities including Lodi, Elmwood Park, Wallington and Passaic, roofs near tall trees and in shady lots are the ones that need cleaning most often, and catching growth early makes the cleaning easier on the roof.
Searching for roof cleaning near me from Garfield or Lodi, Elmwood Park, Wallington and Passaic? Call (551) 348-2856 to talk to a roofer who works in your part of town.
Roofs in this climate
Winters here are long and cold, with snow on the roof for weeks at a time and plenty of nights below freezing. Heat escaping from the attic melts snow on the upper roof, and the water refreezes at the colder eaves, which is how ice dams form and back water up under the shingles. Coastal storms and heavy spring rain drive water sideways into flashing, valleys and old chimneys. That is why roof repair in Garfield is busiest after a hard winter and before the next one.
Why call
Why fix it now
Drier ceilings
Small roof problems caught early usually stay small repairs.
Roofers who know Garfield
Local roofers see the same roofs and storm damage across Garfield and nearby towns.
Clear next steps
Ask the roofer about the cause, the options and the estimate before work starts.
Common questions about roof cleaning
How often should a roof be cleaned?
Many roofs go several years between cleanings. Sunny roofs with good airflow stay clean longer. Cutting back trees helps too.
Why does my roof have dark stains?
Those dark stains are almost always airborne algae, not dirt. It grows on damp, shaded parts of the roof and feeds on the limestone filler in many asphalt shingles. Algae-resistant shingles slow it down, but even those can streak over time.
Is pressure washing safe for my roof?
High-pressure washing damages most roofs. It strips the protective granules, can lift shingle tabs and forces water under the laps, which shortens the roof life. A low-pressure soft wash cleans the roof without that damage.
Does roof cleaning make my roof last longer?
Cleaning helps most when lichen or moss is present, since they damage shingles over time. Cleaning also makes it easier to see loose shingles and worn flashing. The method makes all the difference.
How are plants protected during roof cleaning?
Good roof cleaners pre-wet and rinse landscaping to dilute any runoff. Some crews also tarp shrubs right below the eaves. Let the roofer know about delicate gardens so they can plan.
More questions? Call (551) 348-2856
Often needed together
Roof Moss Removal
Removing moss from shingle, shake and tile roofs without tearing up the roofing, and repairs to any shingles the moss damaged.
Learn moreGutter Cleaning
Gutter cleaning that clears leaves, needles and sludge by hand, then flushes the gutters and downspouts, before overflow rots the fascia.
Learn moreRoof Maintenance
Seasonal roof maintenance for shingles, flashing, vents, gutters and attic airflow, with each task done the right way for the material.
Learn moreCedar Shake Roof Repair
Cedar roof repairs from single cracked shakes up to worn ridge caps and open valleys, matched to what a close look at the roof actually finds.
Learn more
Looking for something else?
See all roofing servicesNeed roof cleaning in Garfield, NJ?
Call (551) 348-2856 to talk to a roofer serving Garfield, NJ.