Signs Your Roof Needs Professional Cleaning
Roofs around Seattle spend most of the year wet, which is exactly what moss, algae and lichen need to get started. These are the signs we see before a roof starts to suffer.
- Dark streaks or black staining running down the slope
- Green moss or algae spreading across shingles or tiles
- Grey, crusty lichen patches that stay put through the summer
- Granules collecting in gutters or at the base of downspouts
- Lifted or missing shingles after a wet season
- Debris, needles and branches trapped in valleys or behind ridges
- Water staining on ceilings or exterior walls below the roof line
- A roof that looks older than the building it sits on
Commercial Roof Cleaning Services in Seattle
We clean commercial roofs with a soft wash, not a hard blast. The right mix of low pressure and treatment lifts moss and algae without stripping the roof surface or forcing water under the flashing.
Our crews work on offices, retail buildings, warehouses, multi-family properties and industrial sites across the Seattle metro area.
- Low-pressure soft washing for shingle, tile, metal and membrane roofs
- Moss, algae and lichen treatment that addresses the growth at the root
- Debris removal from valleys, drains and around roof penetrations
- Gutter and downspout flushing so runoff leaves the building
- Rust and stain treatment on metal panels and vents
- Recurring maintenance for multi-building and multi-site portfolios
- Photo documentation after each visit for property managers
Roof Types We Clean
Every roof material takes a different mix and a different pressure. We set the method to the roof, not the other way around.
- Asphalt shingle roofs
- Cedar shake and wood shingle roofs
- Tile and slate roofs
- Metal and standing seam roofs
- TPO, EPDM and other single-ply membrane roofs
- Modified bitumen and coated flat roof systems
Why Soft Washing Is the Right Method for Roofs
A pressure washer running at full power can hit 1,500 to 4,000 PSI. On a roof, that’s enough to blow granules off asphalt shingles, crack brittle tiles, force water under flashing and around fasteners, and void a manufacturer’s warranty. The damage usually shows up months later as a leak.
Soft washing runs far lower, in the range of a garden hose on full, and lets a cleaning solution do the work. The mixture dwells on the growth for 15 to 20 minutes, killing the moss and algae at the root, and then rinses away with low pressure water. This is the method roof manufacturers and the cleaning industry recommend for shingle, tile, cedar and coated roofs.
We still use full pressure where it belongs, on the concrete, sidewalks and driveways around the building. Read more about that on our pressure washing services page.
Industries We Serve
Services Provided
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Janitorial Services
We will determine your needs and customize your service, but our janitorial service includes tasks such as sanitizing and cleaning restrooms and lunchrooms, dusting cubicles, mopping floors, vacuuming carpets, cleaning windows, trash removal, re-stocking items, etc.
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Window Cleaning Services
Our experienced team of professionals will assess your building, access points, foot traffic, and surrounding conditions to determine the safest and most effective way to remove pollen, water stains, dirt, and buildup from your windows.
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Pressure Washing
Our commercial, high-power pressure washing will rid your outside surfaces of dirt, grime, mold, and will give the exterior of your buildings a fresh, clean look.
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High Dusting Services
Our team will reach all of those hard-to-get spots and remove the dust, allergens, and dirt that can build up in these locations so you don’t risk trying to reach these areas.
Janitorial Services
Window Cleaning Services
Pressure Washing
High Dusting Services
Other Services We Offer
Beyond this service, our team covers the full range of commercial cleaning your property needs. Explore a service below to see what is included and get a free quote.
Areas We Serve:
Our office is in Seattle, and we serve businesses across the greater Puget Sound area, including:
How Our Roof Cleaning Process Works
Roofs are treated in a set order so the cleaning is even and nothing around the building gets damaged.
- We review the roof, the material and the growth before quoting
- Plants, siding, vents and openings are covered and protected
- The soft wash treatment is applied from the ground, a ladder or a stable platform where possible
- The solution dwells for 15 to 20 minutes to reach the roots of the growth
- The roof is rinsed with low pressure and debris is cleared from valleys and drains
- Gutters and downspouts are flushed and the site is checked before we leave
What Our Commercial Roof Cleaning Removes
Most commercial roofs carry several kinds of buildup at once. Each one is treated, not just rinsed.
- Black algae streaks that make the whole building look neglected
- Moss and lichen working their way under shingle edges
- Tree debris, needles and leaf litter in valleys and behind ridges
- Bird droppings on ridges, vents and flat roof sections
- Mildew and mould staining on shaded slopes
- Rust streaks on metal panels, fasteners and roof vents
- Mineral and water staining around penetrations
How Often Should Commercial Roofs Be Cleaned?
There is no single schedule for every building. Tree cover, shade, roof material and the amount of rain the slope catches all move the timeline.
- Shaded and tree-covered roofs: every 12 to 18 months
- Roofs with visible moss: treat yearly before it spreads
- Metal and single-ply flat roofs: every 12 to 24 months
- Buildings next to trees: a check each spring and autumn
- After a long wet season: look for moss and blocked drains
- Fleet or multi-building portfolios: a set schedule across all sites
Common Roof Problems We Fix
These are the roof issues we handle most often on commercial properties in Seattle.
- Moss lifting shingle edges so wind and water get underneath
- Blocked valleys and drains that cause water to sit on the roof
- Algae staining that makes a well-kept building look run down
- Debris buildup after autumn and winter storms
- Rust and corrosion on metal panels and fasteners
- Leaks that trace back to trapped debris around a penetration
Why Use Seattle Commercial Cleaners?
Seattle Commercial Cleaners is a family-owned and operated company that has served the Seattle metro area since 2012. Our roof cleaning crews are trained, insured and equipped for commercial work, and we follow current safety standards on every job. A portion of every scheduled job supports Seattle Humane, The Ocean Cleanup or Seattle Children’s.
- Local since 2012: more than a decade of commercial cleaning across Seattle, Bellevue, Renton, Kent, Tacoma and the surrounding area.
- Trained and insured technicians who use up-to-date equipment and follow current safety standards.
- Soft wash methods that protect shingles, tiles and roof coatings instead of stripping them.
- English and Spanish speaking staff.
- Members of ISSA, the International Window Cleaning Association, BOMA and other industry organizations.
- Free, fast quotes and a satisfaction guarantee on every job.
You can read more about our team, see the industries we serve, or check the areas we cover. Ready to book? Request a free roof cleaning quote.
Reviews
Ryan and his crew positively assured my concerns about safety and the type of work to be performed. Deck cleaning and entire house washing with excellent results and superb clean-up done all in one day. I Highly, highly recommend it.
The team was very responsive to our time-sensitive project. We will definitely be using them in the future for our other retail units. Professional communication and quality work!
We just had our windows washed. I highly recommend their business. We found them to be prompt and friendly. Their work is excellent. We have many windows, 59 to be exact, and they all look beautiful. Their prices are extremely reasonable.
Benefits of working with us:
- We are highly trained for each cleaning task, including commercial roof cleaning.
- We use safe, industry-standard products and soft wash methods that protect the roof surface.
- We schedule around your operating hours, including after-hours and weekend roof cleaning.
- We are one point of contact for one-time roof cleaning and recurring maintenance.
- We build a long-term relationship with your team and keep our service consistent.
- We have immaculate attention to detail and provide first-rate commercial cleaning.
Green Cleaning Products
Highly Qualified Cleaners
We Get the Job Done Right
Satisfaction Guaranteed
Contact us today for a fast quote from our friendly, experienced, and professional team. Let us take the burden of cleaning so that you can get back to work.
To schedule roof cleaning, call us at (206) 755-2949 or visit our contact page.
Seattle Location
