Streak cleaning
Dark streaks on shingles are treated and rinsed so the roof color comes back.
Exterior Services
Roof Cleaning South Orange, NJ
A roofing contractor in South Orange 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. Dial (973) 858-1859 to talk with a local roofer about cleaning your roof.
The black or dark green stains on most roofs are a hardy algae that spreads on the wind and grows on the shaded, damp parts of the roof. 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. A pressure washer strips granules, lifts shingle tabs and drives water under the roofing, which is why low-pressure methods are the standard. With a soft wash, the cleaning solution does the work, not water pressure.
A few details help plan the cleaning. Look at whether the growth is flat staining, crusty lichen spots or thick moss, and whether it is worse under trees. It also helps to know what is growing beneath the roof edges, since plants are protected during the wash.
Many roof cleaning calls in South Orange also turn up a need for roof moss removal or gutter cleaning.
Dealing with this in South Orange, NJ right now? Call (973) 858-1859 and describe the problem to a roofer who works in South Orange.
Call nowThe process
How roof cleaning works
Good roof cleaning is gentle on the roof and careful with everything below it.
Inspect the roof
Before any spraying, the roof is checked for loose shingles, cracked tiles and worn flashing that the cleaning should not disturb. A roof in poor shape may need repairs before cleaning.
Cover the plants
Landscaping below the eaves is soaked with fresh water so it does not absorb the cleaning solution. Gutter runoff can be directed away from planted areas.
Treat the roof
A low-pressure sprayer applies the solution evenly, letting it soak in to kill the growth. Dwell time matters more than pressure.
Rinse gently
The roof is rinsed at low pressure where the method calls for it, and debris is cleared from valleys and gutters. Lichen often releases over time after it dies.
Final check
Plants, siding and walkways are rinsed again with clean water, and the roof is checked one last time. Any damage found during cleaning is pointed out.
What is included
Common roof cleaning work
Tile roof cleaning
Concrete and clay tile roofs are cleaned with care to avoid cracking with solutions safe for metal finishes.
Debris removal
Debris dams are removed from around skylights so water drains freely.
Lichen removal
Crusty lichen is treated so it dies and releases from the shingles without damaging the surface.
Zinc strips
Zinc or copper strips can be installed near the ridge to keep the roof clean longer.
Related service
Roof Soft Wash South Orange, NJ
Soft washing is the low-pressure method used on most roofs, relying on a cleaning solution rather than force. 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.
Most South Orange homeowners with streaked shingles are well served by a soft wash. The key is protecting what sits below the roof, since the solution can harm plants if it is not diluted or rinsed. Expect algae to clear first and crusty lichen to fade over the following weeks.
Related service
Roof Cleaning Service South Orange, 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. While cleaning, a roofer can flag loose shingles, cracked tiles and failing pipe boots.
In South Orange, many homeowners pair roof cleaning with gutter cleaning, since the gutters fill with debris washing off the roof. After cleaning, metal strips near the peak can keep algae and moss from coming back as quickly. Cutting back overhanging limbs lets the roof dry faster.
Local help
Roof Cleaning Near Me
Roof cleaning calls in South Orange come from homes with shaded roofs, older shingles and newer roofs that have started to streak alike. Across South Orange and nearby communities including Vauxhall, East Orange, Union and Short Hills, roofs near tall trees and in shady lots are the ones that need cleaning most often, so a gentle cleaning every few years keeps the roof looking right without wearing it down.
Need roof cleaning around South Orange? Call (973) 858-1859 for a South Orange roofer who serves the towns around it too.
How the weather here affects roofs around South Orange
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, building ice dams that push 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 South Orange 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.
Familiar with local homes
Roofers in South Orange know the roof types and weather wear common in local homes.
Clear next steps
Ask the roofer about the cause, the options and the estimate before work starts.
Common questions about roof cleaning
Is pressure washing safe for my roof?
Pressure washing is not recommended for asphalt shingle roofs. The force blasts off granules and can drive water under the shingles or crack tile. A low-pressure soft wash cleans the roof without that damage.
Will roof cleaning harm my plants?
Landscaping is watered down before, during and after the wash. Covering sensitive plants and diverting gutter runoff adds protection. Let the roofer know about delicate gardens so they can plan.
How often should a roof be cleaned?
The schedule depends on how fast growth returns. Sunny roofs with good airflow stay clean longer. Cutting back trees helps too.
What causes black streaks on my roof?
Black streaks on a roof are usually algae, often a type called Gloeocapsa magma. 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 cleaning a roof worth it?
Removing lichen and moss helps the roof last, since both hold moisture and work under the shingle edges. It doubles as a chance to check the roof surface. The method makes all the difference.
More questions? Call (973) 858-1859
Other services that may help
Roof Moss Removal
Removing moss from shingle, shake and tile roofs without tearing up the roofing, with zinc or copper strips to keep it from coming back.
Learn moreGutter Cleaning
Hand-cleaned gutters and flushed downspouts, with debris bagged and hauled away, with a check of the seams and hangers along the way.
Learn moreRoof Maintenance
Seasonal roof maintenance for shingles, flashing, vents, gutters and attic airflow, 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, so a sound cedar roof keeps shedding water.
Learn more
Looking for something else?
See all roofing servicesTalk to a South Orange roofer about roof cleaning
Call (973) 858-1859 to talk to a roofer serving South Orange, NJ.