Lichen treatment
Crusty lichen is treated so it dies and releases from the shingles then wash away over time.
Exterior Services
Roof Cleaning Tenafly, NJ
A roofing contractor in Tenafly can clean shingle, tile and metal roofs with the right solution and gentle rinsing instead of a pressure washer, with tips to keep the streaks from returning. Call (551) 355-3330 to reach a local roofer.
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.
Cleaning a roof the wrong way can do more damage than the algae ever would. High-pressure spray tears granules off shingles and can break tile, so the safer method is a soft wash. 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. Write down which parts of the roof are stained and whether you see green moss, gray lichen or just dark streaks. It also helps to know what is growing beneath the roof edges, since plants are protected during the wash.
If the problem goes deeper than it first looked, a Tenafly roofer may also recommend roof moss removal or gutter cleaning.
Need roof cleaning in Tenafly? Call (551) 355-3330 and describe the problem to a roofer who works in Tenafly.
Call nowThe process
The roof cleaning process
A roof cleaning protects the house and yard before any solution goes on the roof.
Check the surface
Before any spraying, the roof is checked for loose shingles, cracked tiles and worn flashing that the cleaning should not disturb. Damaged shingles are better repaired than washed.
Protect the yard
Plants and lawn near the house are watered down, and delicate shrubs may be covered. Downspouts may be diverted so runoff does not pool in garden beds.
Apply the soft wash
A low-pressure sprayer applies the solution evenly, letting it soak in to kill the growth. Dwell time matters more than pressure.
Finish the wash
The roof is rinsed at low pressure where the method calls for it, and debris is cleared from valleys and gutters. Some stains keep fading over the following weeks as rain finishes the job.
Clean up below
Once the roof is done, landscaping and surfaces are rinsed and the gutters are checked. The roofer notes any shingles or flashing that need repair.
What is included
Common roof cleaning work
Metal roof cleaning
Tile and metal roofs get a cleaning suited to the material so the surface is not harmed.
Algae streak removal
Black algae streaks are removed with a low-pressure soft wash so the roof color comes back.
Zinc strips
Preventive strips are fitted below the ridge cap so rain carries metal ions down the roof.
Valley clearing
Leaves and needles are cleared from valleys and behind vents to stop water from backing up.
Related service
Roof Soft Wash Tenafly, NJ
A soft wash treats the roof with a diluted cleaning mix at about the pressure of a garden hose. The cleaning mix breaks down the growth and its root structure, not just the visible stain. Because it kills the growth rather than scraping it off, the roof stays clean longer than with pressure washing.
Most Tenafly homeowners with streaked shingles are well served by a soft wash. Gardens below the eaves are soaked first and rinsed again at the end. Some streaks fade right away, while heavy lichen may take a few rains to wash off fully.
Related service
Roof Cleaning Service Tenafly, NJ
Professional roof cleaning covers prep, treatment, debris removal and cleanup, done from a ladder or with roof safety gear. Roofs become slick once wet or treated, and falls from roofs are a real hazard. A roofer also brings the advantage of spotting damage, like lifted shingles or worn flashing, while the roof is clean.
In Tenafly, many homeowners pair roof cleaning with gutter cleaning, since the gutters fill with debris washing off 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 Tenafly, most roof cleaning requests start with dark algae streaks on the shaded side of the house. Homes in Tenafly and nearby towns like Cresskill, Englewood, Englewood Cliffs and Demarest range from older roofs with standard shingles to newer roofs with algae-resistant granules, and both can streak over time, so a gentle cleaning every few years keeps the roof looking right without wearing it down.
Need roof cleaning around Tenafly? Call (551) 355-3330 for a Tenafly roofer who serves the towns around it too.
What the local climate does to a roof
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. Most homeowners in Tenafly, NJ have the roof checked in the fall and again after the snow melts.
Why call
Why not wait
Drier ceilings
A roof problem fixed early rarely spreads to the decking, the insulation or the ceilings.
Roofers who know Tenafly
Roofers in Tenafly know the roof types and weather wear common in local homes.
Know what happens next
Ask your questions before you agree to anything.
Common questions about roof cleaning
Why does my roof have dark stains?
Most dark roof stains come from a hardy algae that spreads on the wind. 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 wears down the surface that protects shingles from the sun. Ask for a soft wash instead.
Is cleaning a roof worth it?
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 benefit depends on using a soft wash.
Will roof cleaning harm my plants?
Good roof cleaners pre-wet and rinse landscaping to dilute any runoff. Delicate plants can be covered, and downspouts can be directed away from beds. Mention any prized plants before work starts.
When should I clean my roof again?
The schedule depends on how fast growth returns. Sunny roofs with good airflow stay clean longer. Preventive strips help keep the roof clean longer.
More questions? Call (551) 355-3330
Related services
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, with a check of the seams and hangers along the way.
Learn moreRoof Maintenance
Regular upkeep that keeps small roof problems from becoming leaks, so the roof reaches the end of its expected life.
Learn moreCedar Shake Roof Repair
Replacing split, cupped or missing shakes, clearing moss and fixing valleys and ridge caps, matched to what a close look at the roof actually finds.
Learn more
Looking for something else?
See all roofing servicesTalk to a Tenafly roofer about roof cleaning
Call now for Tenafly roof cleaning and help in the towns around it.