Home › Recent Projects › Roof Cleaning in Lynnwood, WA (Moss Removal, Tune-Up, Gutters)
Squatch Roofing cleaned a moss-covered three-tab shingle roof in Lynnwood, WA 98036 in July 2026. The June 18 inspection found moss growing in nearly every keyway and course line, and foam gutter inserts packed with needles. On July 15 the crew pulled the moss out of the courses, sealed exposed fasteners and box vent flanges on a small tune-up, cleaned the gutters, and spread zinc sulphate across the roof. One visit.
| Location | Lynnwood, WA 98036 |
|---|---|
| Service | Roof and gutter cleaning with a small roof tune-up |
| Roof | Three-tab asphalt shingle roof with hips, a valley, box vents, and pipe vents, under nearby conifers |
| Inspection | June 18, 2026: 15 photos of the slopes, hips, valley, and gutters |
| Findings | Moss in the keyways and course lines on most slopes; needles and moss clumps in the gutters; foam gutter inserts packed with debris |
| Cleaning | Moss pulled from the courses and cleared off the roof; zinc sulphate powder, priced per square of roof |
| Tune-up | Small tier (roofs up to 20 squares): sealant on exposed shingle fasteners and box vent flange fasteners |
| Gutters | Gutter cleaning on the invoice; no after photos of the gutters in the job file |
| Schedule | Inspection June 18; cleaning and tune-up July 15, 2026 (one visit) |
| Project investment range | $1,300 to $2,100 |
What Squatch Found on the Inspection
The 21-point inspection on June 18, 2026 produced 15 photos. On a three-tab roof the moss pattern is easy to read, because the tabs leave a vertical slot (the keyway) every few inches and a horizontal line between courses. This roof had moss growing in both, across most of the slopes the inspector photographed.
- Slopes: moss clumps standing up out of the keyways and course lines, heaviest along the hips and on the lower rows.
- Valley: a line of moss and needles collected where two slopes meet.
- Gutters: moss clumps and needles sitting along the gutter line.
- Gutter inserts: the gutters had foam inserts. The inspector pressed into one, and the photo shows its open cells packed with needles and debris.
What We Recommended
Squatch quoted three line items: a zinc sulphate roof cleaning priced per square, a small roof tune-up, and a gutter cleaning. The inspection photos show moss and debris, not missing or broken shingles, so there was no repair or replacement line. The homeowner approved the quote, and the final invoice matched it plus Washington sales tax.
How the Cleaning Was Done
July 15, 2026: the photo log for the day runs in three stages.
- Moss removal: the crew pulled the moss out of the courses with a long-handled tool and swept it into rows on the roof before clearing it off. The photos show the piles running across the slope.
- Tune-up: with the shingles cleared, exposed fasteners on the shingle field and the fasteners on the box vent flanges were sealed with fresh sealant, and each one was photographed.
- Zinc sulphate: the powder went on last, along the ridge and hips and down each slope.
The Finished Result
The completion photos show the keyways and course lines open again and white zinc sulphate across the ridge, hips, and slopes. That white is the treatment. It is applied dry and left on the roof, where rain dissolves it over the following weeks. The gutter cleaning is on the invoice, but the job file has no after photos of the gutters, so this post does not show their finished condition.
What This Cleaning Cost
Project investment range: $1,300 to $2,100. This range reflects the scope of this completed project and is not a current quote. It is anchored on the final invoice total, which includes Washington sales tax.
Three lines set this price. The zinc sulphate is priced per square of roof, so the roof’s size moves it most. The tune-up is the small tier, for roofs up to 20 squares. The gutter cleaning is its own line. There was no shingle, flashing, or decking work on the invoice.
What Homeowners With Similar Roofs Should Know
On a three-tab roof, look at the keyways. Moss on this roof started in the slots between tabs and the lines between courses. From the ground those lines look darker or fuzzy before the clumps get big.
Gutter inserts fill up too. The foam inserts here were packed with needles at the inspection, and the gutters still went on the cleaning list.
A cleaning is a good time to seal fasteners. Once the moss was off, the exposed nails and vent flange fasteners could be seen and sealed on the same visit.
Related questions
How much did this roof cleaning in Lynnwood cost?
The project investment range was $1,300 to $2,100 for moss removal, a zinc sulphate treatment, a small roof tune-up, and a gutter cleaning on a three-tab shingle roof. The range reflects this project’s scope and is not a current quote.
How was the moss removed?
The crew pulled it out of the keyways and course lines with a long-handled tool, swept it into rows on the roof, and cleared it off. Zinc sulphate went on afterward.
What did the tune-up include?
On this job, the small tune-up photos show fresh sealant over exposed fasteners in the shingle field and on the box vent flanges, with each sealed spot photographed.
Why is the roof white after the cleaning?
The white is dry zinc sulphate powder. It is left on the roof, and rain dissolves it and carries it down the slopes over the following weeks.
How long did the job take?
One visit on July 15, 2026, about four weeks after the June 18 inspection.
Have a roof with similar symptoms?
If moss is filling the lines on your shingles, Squatch Roofing can run a free 21-point inspection, show you the photos, and tell you whether a roof and gutter cleaning is enough. Squatch serves Lynnwood, the Eastside, and the greater Seattle area. Related projects: the Seattle three-tab cleaning and tune-up and the Lynnwood hip cap repair with zinc sulphate. Schedule an inspection or call (425) 292-8327.
This project documentation was prepared by Squatch Roofing from the job records and photos from our crew, October 2026. Technical review by Ben Metsker, Manager, Squatch Roofing.
