Professional Roof and Gutter Cleaning
in the Pacific Northwest
Brush moss removal, zinc sulphate ridge treatment, and full gutter clean-out by Squatch Roofing, keeping homes across Greater Seattle and the Eastside clean and properly draining.
The Pacific Northwest climate is one of the most demanding for roofs in the country. Consistent rainfall, mild temperatures, and heavy tree coverage create the exact conditions moss needs to establish and spread. Left alone, moss and debris buildup shortens shingle life, blocks gutters, and sets up the kind of water damage that turns into a much bigger problem than a cleaning would have been.
Squatch Roofing handles roof and gutter cleaning with a brush-based moss removal process and a zinc sulphate ridge treatment that keeps working long after we leave. The service removes approximately 80% of existing moss growth and sets up a chemical barrier that inhibits regrowth with every rainfall. We recommend a follow-up treatment around six months later to reinforce the protection. Every cleaning includes a full gutter clear-out and a roof inspection.
Signs It’s Time for a Roof Cleaning
Most homeowners wait until the roof looks visibly bad. By then, the moss has usually been established for a season or more. These are the signs to catch it earlier:
- Visible Moss or Lichen Growth: Moss patches on shingles hold moisture against the surface and work their way under shingle edges over time, causing lifting, cracking, and water intrusion. In the Pacific Northwest, moss can establish quickly on north-facing or shaded sections and spread across the roof within a season or two.
- Debris Buildup from Trees: Leaves, needles, and organic material that sit on the roof trap moisture and create the damp conditions that moss needs to grow. Clearing this buildup regularly interrupts that cycle before it starts.
- Granule Accumulation in Gutters: Heavy granule loss in the gutters can indicate organic growth on the roof surface is accelerating shingle wear. A cleaning and zinc treatment helps slow further deterioration on shingles that are otherwise structurally sound.
- Blocked or Slow-Draining Gutters: Debris from the roof surface accumulates in gutters and eventually blocks drainage entirely. Water that cannot exit through the downspout backs up against the fascia and the roofline, causing damage that goes well beyond the gutter itself.
- The Roof Has Not Been Serviced in Several Years: Most roofs in Greater Seattle and the Eastside benefit from cleaning every one to three years depending on tree coverage and sun exposure. Waiting until growth is heavy makes the job harder and the damage already done harder to reverse.
Why We Never Pressure Wash Roofs
Pressure washing is one of the most damaging services a homeowner can hire for an asphalt shingle roof. High-pressure water blasts granules off the shingle surface, voids manufacturer warranties, and can force water under shingle edges and into the underlayment. Contractors who offer roof pressure washing are trading your roof’s remaining lifespan for a quick clean. We do not offer it, and we strongly advise against it. Blow-off and zinc treatment achieves the same result without the damage.
Our Roof and Gutter Cleaning Process
Every cleaning follows a consistent three-part process:
- 1Roof Inspection: Before we touch anything, we walk the roof and assess its overall condition. We note areas of heavy moss concentration, any shingle damage, gutter condition, and drainage performance. This inspection is included with every cleaning service.
- 2Moss Removal by Hand Brush: We brush the moss off the entire roof surface by hand. This method removes approximately 80% of existing moss growth without disturbing shingle granules. Brushing is deliberate and controlled, working from ridge to eave so loosened material falls clear of the roof rather than packing into gutters or valleys.
- 3Zinc Sulphate Powder Applied to the Ridge: After brushing, we apply zinc sulphate powder along the ridge of the roof. Every time it rains, water carries zinc ions down the full slope of the roof, inhibiting moss and algae regrowth across the entire surface over time. The ridge is the correct application point because it lets natural rainfall distribute the treatment evenly without manual reapplication to the full roof.
- 4Full Gutter Clean-Out: We clear all gutters and downspouts of debris, packed sediment, and any material cleared from the roof. We verify that every downspout is draining freely before we leave.
- 5Condition Report and Retreatment Schedule: Once the job is complete, we give you a straightforward summary of what we found. We also recommend scheduling a retreatment in approximately six months. The initial cleaning removes the bulk of established moss. The follow-up application reinforces the zinc barrier and addresses any regrowth before it takes hold again.
The whole service is handled by the same licensed roofing crew that handles our repairs and installations, which means the inspection portion carries real weight.
Why Homeowners Choose Squatch for Roof Cleaning
- Roofers, Not Just Cleaners: Squatch Roofing sends trained roofing crews to every cleaning job. While we are up there clearing the roof, we are also looking at shingle condition, flashing, granule loss, and anything else that might need attention. You get a cleaning and an inspection in one visit.
- No Pressure Washing: Pressure washing is one of the most damaging things you can do to an asphalt shingle roof. The high-pressure water blasts granules off the shingle surface, voids manufacturer warranties, and can drive water under shingle edges into the underlayment. We do not offer pressure washing and we recommend against it. Blow-off and zinc treatment gets the job done without shortening the life of your roof.
- Zinc Ridge Treatment Keeps Working: Applying zinc sulphate to the ridge is the correct long-term approach. Rainfall carries the zinc down the full slope of the roof with every storm, inhibiting moss and algae across the entire surface over time. We recommend a follow-up application around six months after the initial cleaning to reinforce the barrier and address any regrowth before it reestablishes.
- Gutter Cleaning Always Included: Cleaning a roof without clearing the gutters is half a job. Debris loosened from the roof surface ends up in the gutters, and gutters that cannot drain create their own set of problems. We always include a full gutter clear-out.
- Licensed and Insured: Squatch Roofing is fully licensed and bonded in Washington State. Every crew member working on your property is covered. You are not taking on liability risk with an unlicensed operation.
Clean Now, Replace Later
Regular roof cleaning in the Pacific Northwest is not a cosmetic service. It is practical maintenance that directly extends the life of your shingles and keeps your drainage system functioning properly year-round. A clean roof also gives you an accurate read on the shingles underneath so you know what you are actually working with. Squatch Roofing handles the whole job in one visit and leaves you with a clear picture of your roof’s condition. Schedule your service and we will take care of it.
Frequently Asked Questions
Squatch Roofing has a knowledgeable and experienced team that can help answer a variety of questions you may have.
Why is pressure washing bad for roofs?
High-pressure water removes the granules that protect asphalt shingles from UV exposure and weathering. Once granules are stripped, the underlying asphalt mat degrades much faster and the manufacturer warranty is voided. Pressure washing also pushes water under shingle edges, which can compromise the underlayment. The roof may look cleaner immediately afterward, but the damage accelerates failure significantly. Blow-off and zinc treatment achieves a clean roof without any of those tradeoffs.
How does the zinc sulphate ridge treatment work?
After brushing the moss off the roof, we apply zinc sulphate powder along the ridge. Every time it rains, water picks up zinc ions at the ridge and carries them down the full slope of the roof. This ongoing exposure inhibits moss and algae from reestablishing across the entire surface. Applying it at the ridge is more effective than spreading it across the whole roof because rainfall does the distribution work automatically. We recommend a follow-up application around six months after the initial service to reinforce the barrier before regrowth takes hold.
How often should I have my roof cleaned?
For most homes in Greater Seattle and the Eastside, every one to three years is reasonable. Homes with heavy tree coverage or significant north-facing roof sections tend to accumulate moss faster and may need more frequent service. Our inspection during the cleaning visit will give you a realistic interval recommendation based on what we see on your specific roof.
Is gutter cleaning always included?
Yes. We do not offer roof cleaning without gutter cleaning. Debris cleared from the roof surface has to go somewhere, and clearing the roof while leaving the gutters packed is pointless. Every service includes a full gutter and downspout clean-out and a check that drainage is flowing properly before we leave.
