Metal roof cleaning
Tile and metal roofs get a cleaning suited to the material with solutions safe for metal finishes.
Exterior Services
Roof Cleaning Dover, NJ
A roofer in Dover 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 (862) 430-1002 to talk with a local roofer about cleaning your roof.
Those black streaks running down a shingle roof are almost always algae, not dirt or mold from inside the house. As it spreads, it darkens the roof in long streaks, usually starting on the north side or under trees. Algae on its own is mainly cosmetic, though it often travels with lichen and moss, which hold water and work under the shingle edges.
The method decides whether cleaning helps the roof or shortens its life. A pressure washer strips granules, lifts shingle tabs and drives water under the roofing, which is why low-pressure methods are the standard. 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.
It helps to note what you see before the visit. 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.
Many roof cleaning calls in Dover also turn up a need for roof moss removal or gutter cleaning.
Need roof cleaning in Dover? Call (862) 430-1002 to talk to a local roofer.
Call nowThe process
The roof cleaning process
Here is how a roofer typically cleans a roof.
Start with a look
The roofer checks the roof material, the type of growth and the condition of the shingles, flashing and vents before cleaning. A roof in poor shape may need repairs before cleaning.
Protect the yard
The crew wets down plants and grass and moves outdoor furniture away from the walls. Siding and windows are rinsed to keep the solution from drying on them.
Spray the solution
A low-pressure sprayer applies the solution evenly, letting it soak in to kill the growth. The strength is adjusted to the roof and the type of growth.
Finish the wash
After the solution works, loose debris is swept from valleys and the gutters are cleared. Heavy lichen can take several rains to wash away fully.
Clean up below
The area below the eaves gets a final rinse to dilute any runoff. The roofer notes any shingles or flashing that need repair.
What is included
Common roof cleaning work
Streak cleaning
Algae staining is cleaned off without scrubbing across every stained slope.
Lichen treatment
Lichen patches are sprayed and left to loosen instead of being scraped off.
Debris removal
Built-up debris is swept off the roof so water drains freely.
Regrowth prevention
Preventive strips are fitted below the ridge cap to keep the roof clean longer.
Related service
Roof Soft Wash Dover, NJ
A roof soft wash cleans the roof with a solution and low-pressure spray instead of a high-pressure stream. The solution, often a diluted sodium hypochlorite mix with a surfactant to help it cling, kills algae, lichen and moss spores where they grow. The gentler approach protects granules, laps and sealant strips.
In Dover, 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. Expect algae to clear first and crusty lichen to fade over the following weeks.
Related service
Roof Cleaning Service Dover, 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.
Many Dover roof cleanings end with clearing the gutters and downspouts. Zinc or copper strips installed near the ridge help slow regrowth, as rain washes metal ions down the roof. Cutting back overhanging limbs lets the roof dry faster.
Local help
Roof Cleaning Near Me
Around Dover, most roof cleaning requests start with dark algae streaks on the shaded side of the house. Homes in Dover and nearby towns like Wharton, Rockaway, Mount Arlington and Morris Plains 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.
For roof cleaning in Dover, NJ or nearby towns like Wharton, Rockaway, Mount Arlington and Morris Plains, call (862) 430-1002 to reach a roofer who covers your street.
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, building ice dams that push water up under the shingles. Strong coastal storms push rain into every weak spot at the flashing and valleys. Most homeowners in Dover, NJ have the roof checked in the fall and again after the snow melts.
Why call
Why not wait
Smaller repairs
A roof problem fixed early rarely spreads to the decking, the insulation or the ceilings.
Local knowledge
Local roofers see the same roofs and storm damage across Dover and nearby towns.
Straight answers
Ask your questions before you agree to anything.
Common questions about roof cleaning
Is pressure washing safe for my roof?
High-pressure washing damages most roofs. It wears down the surface that protects shingles from the sun. Soft washing is the safe alternative.
What causes black streaks on my roof?
Black streaks on a roof are usually algae, often a type called Gloeocapsa magma. The algae forms a dark outer coating that shows up as long streaks. Algae-resistant shingles slow it down, but even those can streak over time.
How often should a roof be cleaned?
Most roofs need cleaning only every few years, depending on shade and moisture. Sunny roofs with good airflow stay clean longer. Zinc or copper strips and trimmed branches can stretch the time between cleanings.
Is cleaning a roof worth it?
Removing lichen and moss helps the roof last, since both hold moisture and work under the shingle edges. 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 (862) 430-1002
Other services that may help
Roof Moss Removal
Removing moss from shingle, shake and tile roofs without tearing up the roofing, so water drains the way the roof was built for.
Learn moreGutter Cleaning
Gutter cleaning that clears leaves, needles and sludge by hand, then flushes the gutters and downspouts, so the next storm drains the way it should.
Learn moreRoof Maintenance
Routine roof care: clearing valleys, replacing worn pipe boots, sealing exposed nails and resetting lifted shingles, with each task done the right way for the material.
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 Dover roofer about roof cleaning
Call now for Dover roof cleaning and help in the towns around it.