Lichen treatment
Lichen spots are killed at the root without damaging the surface.
Exterior Services
Roof Cleaning Randolph, NJ
A roofer in Randolph 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. Call (973) 858-1826 to reach a local roofer.
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.
Cleaning a roof the wrong way can do more damage than the algae ever would. 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. Soft washing uses a cleaning mix and gentle rinsing to kill algae and lichen, and lets the roof dry naturally.
Some quick observations make the first conversation easier. Look at whether the growth is flat staining, crusty lichen spots or thick moss, and whether it is worse under trees. Mention the roof material, its age and whether gardens or delicate plants sit right below the eaves.
If the problem goes deeper than it first looked, a Randolph roofer may also recommend roof moss removal or gutter cleaning.
Looking for Randolph roof cleaning? Call (973) 858-1826 to reach a nearby roofing contractor.
Call nowThe process
How roof cleaning works
A roof cleaning protects the house and yard before any solution goes on the roof.
Start with a look
An inspection shows what is growing on the roof and whether any repairs should come first. Damaged shingles are better repaired than washed.
Cover the plants
Landscaping below the eaves is soaked with fresh water so it does not absorb the cleaning solution. Downspouts may be diverted so runoff does not pool in garden beds.
Apply the soft wash
A cleaning solution matched to the roof material is applied at low pressure, from the bottom of the slope up. The strength is adjusted to the roof and the type of growth.
Rinse gently
After the solution works, loose debris is swept from valleys and the gutters are cleared. Some stains keep fading over the following weeks as rain finishes the job.
Rinse the plants
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
What roof cleaning covers
Valley clearing
Debris dams are removed from around skylights to stop water from backing up.
Tile roof cleaning
Metal roofs are washed to remove grime and staining without walking on fragile tile.
Regrowth prevention
Preventive strips are fitted below the ridge cap so rain carries metal ions down the roof.
Algae streak removal
Black algae streaks are removed with a low-pressure soft wash across every stained slope.
Related service
Roof Soft Wash Randolph, 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. Because it kills the growth rather than scraping it off, the roof stays clean longer than with pressure washing.
For Randolph roofs, soft washing is the method most roofers recommend over pressure washing. The key is protecting what sits below the roof, since the solution can harm plants if it is not diluted or rinsed. Some streaks fade right away, while heavy lichen may take a few rains to wash off fully.
Related service
Roof Cleaning Service Randolph, NJ
A roof cleaning service handles the full job, from protecting the yard to treating the roof and clearing gutters. 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.
Many Randolph 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 Randolph, most roof cleaning requests start with dark algae streaks on the shaded side of the house. From Randolph out to neighboring towns such as Dover, Wharton, Succasunna and Rockaway, older roofs often need lichen and moss treatment while newer ones usually just need streaks removed, so a gentle cleaning every few years keeps the roof looking right without wearing it down.
For roof cleaning in Randolph, NJ or nearby towns like Dover, Wharton, Succasunna and Rockaway, call (973) 858-1826 to reach a roofer who covers your street.
How the weather here affects roofs around Randolph
Cold winters bring snow, ice and a long stretch of freezing nights. 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 Randolph is busiest after a hard winter and before the next one.
Why call
Why not wait
Smaller repairs
Small roof problems caught early usually stay small repairs.
Roofers who know Randolph
Roofers in Randolph 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. 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.
How often should a roof be cleaned?
The schedule depends on how fast growth returns. Shaded roofs and roofs near trees grow algae and lichen faster. Cutting back trees helps too.
How are plants protected during roof cleaning?
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.
Is cleaning a roof worth it?
Cleaning helps most when lichen or moss is present, since they damage shingles over time. It doubles as a chance to check the roof surface. The benefit depends on using a soft wash.
What causes black streaks on my roof?
Black streaks on a roof are usually algae, often a type called Gloeocapsa magma. It thrives in shade and moisture and spreads down the slope with rainwater. Shade, trees and humidity all make it worse.
More questions? Call (973) 858-1826
Related services
Roof Moss Removal
Gentle moss removal and treatment that kills the roots and slows regrowth, 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
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
Repairs for split shakes, rot at the butts, moss buildup and leaking valleys on wood roofs, matched to what a close look at the roof actually finds.
Learn more
Looking for something else?
See all roofing servicesNeed roof cleaning in Randolph, NJ?
Call (973) 858-1826 for a local roofer in Randolph and nearby towns.