Valley clearing
Built-up debris is swept off the roof to stop water from backing up.
Exterior Services
Roof Cleaning Hawthorne, NJ
A roofing contractor in Hawthorne 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 (862) 434-1182 to reach a local roofer.
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. 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.
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. With a soft wash, the cleaning solution does the work, not water pressure.
It helps to note what you see before the visit. 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 Hawthorne roofer may also recommend roof moss removal or gutter cleaning.
Dealing with this in Hawthorne, NJ right now? Call (862) 434-1182 and describe the problem to a roofer who works in Hawthorne.
Call nowThe process
How roof cleaning works
Here is how a roofer typically cleans a roof.
Check the surface
The roofer checks the roof material, the type of growth and the condition of the shingles, flashing and vents before cleaning. Damaged shingles are better repaired than washed.
Cover the plants
Plants and lawn near the house are watered down, and delicate shrubs may be covered. Gutter runoff can be directed away from planted areas.
Spray the solution
A cleaning solution matched to the roof material is applied at low pressure, from the bottom of the slope up. 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.
Final check
The area below the eaves gets a final rinse to dilute any runoff. Any damage found during cleaning is pointed out.
What is included
What roof cleaning covers
Metal roof cleaning
Metal roofs are washed to remove grime and staining without walking on fragile tile.
Streak cleaning
Black algae streaks are removed with a low-pressure soft wash so the roof color comes back.
Lichen removal
Crusty lichen is treated so it dies and releases from the shingles then wash away over time.
Zinc strips
Metal strips are added to slow algae and moss regrowth so rain carries metal ions down the roof.
Related service
Roof Soft Wash Hawthorne, NJ
A soft wash treats the roof with a diluted cleaning mix at about the pressure of a garden hose. A common soft wash uses a diluted chlorine solution with a soap-like surfactant so it stays on the roof long enough to work. Because it kills the growth rather than scraping it off, the roof stays clean longer than with pressure washing.
In Hawthorne, a soft wash is the safe choice for asphalt shingle roofs with algae streaks. 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 Hawthorne, NJ
A roof cleaning service handles the full job, from protecting the yard to treating the roof and clearing gutters. Roofs become slick once wet or treated, and falls from roofs are a real hazard. A cleaning by a roofer doubles as a close look at the roof surface.
Many Hawthorne roof cleanings end with clearing the gutters and downspouts. 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 Hawthorne come from homes with shaded roofs, older shingles and newer roofs that have started to streak alike. From Hawthorne out to neighboring towns such as Glen Rock, Haledon, Fair Lawn and Midland Park, 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.
Searching for roof cleaning near me from Hawthorne or Glen Rock, Haledon, Fair Lawn and Midland Park? Call (862) 434-1182 to talk to a roofer who works in your part of town.
What the local climate does to a roof
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. Strong coastal storms push rain into every weak spot at the flashing and valleys. Most homeowners in Hawthorne, NJ have the roof checked in the fall and again after the snow melts.
Why call
Why not wait
Less damage
Small roof problems caught early usually stay small repairs.
Local knowledge
Roofers in Hawthorne 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.
Roof Cleaning FAQ
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.
What causes black streaks on my roof?
Most dark roof stains come from a hardy algae that spreads on the wind. It thrives in shade and moisture and spreads down the slope with rainwater. Shade, trees and humidity all make it worse.
Is pressure washing safe for my roof?
A pressure washer does more harm than good on shingles. It wears down the surface that protects shingles from the sun. Ask for a soft wash instead.
Is cleaning a roof worth it?
Algae is mostly cosmetic, but lichen and moss can shorten roof life. A clean roof also lets a roofer spot damage that grime was hiding. Cleaning the wrong way, with high pressure, shortens roof life instead.
How often should a roof be cleaned?
Many roofs go several years between cleanings. Roofs under trees or on shaded slopes may need it more often. Cutting back trees helps too.
More questions? Call (862) 434-1182
Often needed together
Roof Moss Removal
Gentle moss removal and treatment that kills the roots and slows regrowth, 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, so the next storm drains the way it should.
Learn moreRoof Maintenance
Seasonal roof maintenance for shingles, flashing, vents, gutters and attic airflow, before debris, wear and weather add up.
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 servicesTalk to a Hawthorne roofer about roof cleaning
Call (862) 434-1182 to talk to a roofer serving Hawthorne, NJ.