Roof Cleaning in Issaquah
In the foothills of Squak Mountain, Tiger Mountain, and Cougar Mountain, a lot of Issaquah roofs are shaded by forest for most of the day. Add the extra rain the valley gets, and moss can cover a roof in just a few seasons.
Thick moss is holding a wet blanket on your roof
On a shaded foothill roof, moss grows in thick cushions that soak up rain and stay saturated for weeks. That constant moisture softens the shingle edges and pushes them up, opening paths for water to get underneath.
Gentle roof cleaning, never pressure washing
Starting at $200 We inspect the full roof, clear moss and debris gently, then apply a roof-safe treatment that kills moss and algae at the root. Anything that comes down into the gutters or onto the ground goes into your yard-waste bin before we leave, and anything extra leaves with us.
Shingles that lie flat and shed rain again
With the moss killed at the root and rinsed away over the following rains, the shingles stop being propped up by wet cushions, and the roof can finally drain and dry between storms.
A roof replaced years early costs far more than treatment
Skip treatment a season or two and granule loss keeps compounding, quietly shaving years off a roof that still had a decade left. Staying on a regular treatment cycle costs a fraction of what a new roof does.
Save on your first service — New customers get 10% off.
Save when you bundle — Request multiple services at once. Fewer trips reduce our carbon footprint and lower your bill.
Save when you subscribe — Repeat every 1, 3, 6, or 12 months.
What's included
- Roof inspection. We walk the roof first to check for existing damage and note anything fragile before treatment starts.
- Gentle cleaning. Moss and debris are cleared gently, without a pressure washer or anything that scrapes the shingles.
- Moss treatment. A roof-safe moss treatment kills moss, algae, and lichen at the root, and keeps working with the next rains.
- Ground-level check. We clear gutters and walkways of anything that washed down and put it in your yard-waste bin (anything that doesn't fit is bagged and taken away), then do a final walk-around to check the shaded, high-buildup slopes.
Worth knowing
Older or already-brittle shingles can be more fragile underfoot, and moss that's been established for years may have already lifted or damaged shingles beneath it. We'll let you know if we spot anything like that before we start, rather than treat over a problem that needs a roofer instead.
Frequently Asked Questions
Can you do anything about the trees hanging over our roof?
Tree trimming is outside what we do, but we'll point out branches that keep parts of the roof shaded or drop the most debris, so you can decide whether to have an arborist trim them.
Our roof is pretty steep. Can you still treat it?
Usually, yes. Our crews are equipped for roof work, and we'll look at the pitch when we quote. Text us a photo of the roof from the street.
Will this damage my shingles the way pressure washing would?
No — we never pressure wash roofs. High-pressure water strips the protective granules off asphalt shingles and can void your roofing warranty. We clean gently, without pressure washing or scraping, and a roof-safe moss treatment does the rest, so moss and algae come off without damaging the roofing material underneath.
How often does a roof need moss or algae treatment?
Most Eastside roofs benefit from treatment every 1-2 years. Shaded, north-facing slopes under trees tend to need it more often than sun-exposed sections, since moss spreads fastest wherever moisture lingers.
Other services in Issaquah
- Gutter Cleaning
- Move-Out Cleaning
- Driveway Pressure Washing
- Patio & Deck Washing
- Siding & House Washing
- Fence Washing
- Window Cleaning
Roof Cleaning in other Eastside cities
Roof Cleaning across the Eastside · All services · Our service area