Roof Cleaning

Seattle’s wet, overcast climate and abundant trees promote heavy moss, algae, lichen, and debris buildup on residential roofs, leading to staining, moisture retention, and potential damage to shingles or tiles. Professional cleaning safely removes these contaminants, restoring appearance and helping extend roof life.

We serve homes in Seattle, Bellevue, Kirkland, Redmond, Renton, Issaquah, Mercer Island, Tacoma, Everett, and communities within a 50-mile radius.

We specialize exclusively in residential roof cleaning for single-family homes, townhomes, and condominiums, using gentle, eco-friendly methods suited to the Pacific Northwest’s roofing materials and environment.

Service Advantages

Restored Curb Appeal

Removing thick moss, black algae streaks, and dirt brightens your roof dramatically, enhancing your home’s look in rainy, green neighborhoods.

Extended Roof Lifespan

Eliminating moss and lichen prevents root penetration and moisture trapping that can degrade shingles and tiles over time.

Prevention of Damage

Regular cleaning reduces risks of lifted shingles, granule loss, or underlayment rot caused by constant dampness and organic growth.

Improved Home Maintenance

A clean roof supports better ventilation, reduces weight stress, and helps maintain property value in Seattle’s competitive real estate market.

Key Cleaning Areas

Asphalt Shingles

We treat heavy moss growth and dark algae streaks common on composition roofs throughout the region.

Cedar Shakes or Shingles

Wood roofs are gently cleared of moss, lichen, and mildew while preserving natural oils and appearance.

Gutters and Valleys

Debris including pine needles, maple leaves, and fir needles is removed to ensure proper drainage during heavy rains.

Roof Surfaces and Edges

Overall buildup from pollen, dirt, and fallen branches is carefully washed away without damaging materials.

Vents and Flashing Areas

Surrounding sections are cleaned to prevent blockages and maintain seals.

Debris from Evergreen Trees

Needles, cones, and branches common in Seattle-area yards are safely cleared from the roof.

Cleaning Process Steps

Initial On-Site Assessment and Consultation

Our team evaluates your roof type (composition, cedar, tile), moss/algae severity, tree overhang, pitch, and any delicate features. We discuss your concerns, explain the safest method for your specific roof, and answer questions so you’re fully informed before we start.

Comprehensive Site Protection

We protect landscaping, decks, siding, windows, and pathways with tarps and drop cloths. Delicate plants, shrubs, and rain gardens common in Seattle homes are watered thoroughly and shielded to safeguard against any runoff.

Safe Application of Cleaning Solution

An eco-friendly, biodegradable solution approved for the Pacific Northwest is applied at low pressure. It gently kills moss, algae, and lichen at the root/spore level without harsh chemicals that could harm Puget Sound ecosystems or your plants.

Gentle Low-Pressure Soft Washing and Moss Removal

Using specialized soft-wash equipment, we rinse with controlled low pressure while manually removing thicker moss mats by hand to avoid dislodging granules or splitting shakes. This preserves roof integrity while achieving deep cleaning.

Manual Debris and Gutter Clearing

Larger debris like branches, needles, and leaves is hand-removed from the surface, valleys, and gutters. Gutters and downspouts are fully flushed to restore clear flow, preventing overflow during Seattle’s frequent downpours.

Final Rinse, Neutralization, and Property Cleanup

Surrounding areas receive a light rinse to neutralize residue. We perform a detailed final inspection to confirm thorough results, remove all tarps and equipment, bag debris for off-site disposal, and blow walkways/driveways clean—leaving your property pristine.

Frequently Asked Questions

How often should I have my roof cleaned in Seattle?

In our moss-prone climate, every 2–4 years is typical, with heavily shaded or tree-surrounded homes often needing attention every 1–2 years. We’ll evaluate yours and suggest the ideal schedule!

What causes all the moss and black streaks on Seattle roofs?

Constant moisture, shade from evergreens, and cool temperatures create perfect conditions for moss and algae (especially on north-facing slopes). The black streaks are usually algae feeding on shingle fillers. Both are fully treatable with gentle methods!

Is roof cleaning safe for cedar shakes?

Yes, absolutely—we’re experienced with cedar and use extra-gentle techniques and wood-safe solutions to remove moss without stripping natural oils or causing splintering.

Will the cleaning solution affect my plants or the environment?

We use only biodegradable, eco-conscious products safe for Puget Sound watersheds. Plants are thoroughly protected and watered before/after—most homeowners are pleasantly surprised at how carefully we safeguard their gardens.

How long does the cleaning process take?

Most residential roofs are completed in one day—typically 4–8 hours depending on size and moss thickness. We work efficiently and can coordinate with your schedule.

Can you clean my roof in the rainy season?

We watch the forecast closely and prefer dry or lightly drizzly days for safety and best results. Late spring through early fall is ideal, but we work year-round when conditions allow.

Do you include gutter cleaning with roof cleaning?

Yes! Clearing gutters and downspouts is always part of the service to ensure complete drainage—essential with Seattle’s heavy rainfall.

Is roof cleaning available in surrounding cities?

We’d love to help! We serve residential homes throughout the greater Seattle area within 50 miles, including Bellevue, Kirkland, Redmond, Renton, Issaquah, Mercer Island, Tacoma, Everett, and all surrounding communities.

Common Roofing Materials We Clean

We safely clean the roof types most popular in Seattle homes:

• Asphalt composition shingles
• Architectural shingles
• Cedar shakes and shingles
• Concrete tile
• Composite shingles
• Metal accents and sections

Typical Buildup Issues by Area

Ready to remove moss and restore your roof’s beauty? Contact us today for a friendly consultation—we’re here to help keep your Seattle-area home looking great and protected year-round!