When we handle roof cleaning for cedar shake roofs in Mercer Island, WA, it comes down to three things: protecting your plants and property, cleaning with the right method, and walking the job with you at the end. For cedar shake roofs, that means soft wash.
Method and pressure
Cleaning solution: A wood-safe roof cleaning solution, sometimes followed by a brightener and preservative.
What to know about cleaning cedar shake roofs
Cedar shakes grow moss and lichen and turn gray as the wood weathers. Cleaning removes growth and lets the roof dry faster, and many owners follow it with a preservative treatment.
Avoid: High pressure, which erodes and splits the wood and shortens the roof's life.
How often: Every 2-4 years.
When to book roof cleaning for cedar shake roofs
- Black or dark streaks running down the roof
- Green moss or lichen spots, often on the north side
- Roof looks older than it is
- Moss lifting the edges of shingles
- A home inspector or insurer has noted roof growth
What causes the dirt and stains
- Roof algae (often Gloeocapsa magma) spread by wind
- Shade from trees and the north-facing side staying damp
- Debris piles in valleys that hold moisture
- Moss and lichen that root into the roof surface
Safe steps for homeowners
- Keep valleys and gutters clear of leaves and pine needles
- Trim branches to let in sun and air
- Consider zinc or copper strips near the ridge to slow regrowth
- Look from the ground with binoculars instead of climbing on the roof
Not sure what you're looking at? The free stain identifier and safe pressure guide explain each stain and surface.
What can go wrong with DIY pressure washing
- Pressure washing strips granules and can void a shingle warranty
- Falls from a slippery, wet roof
- Chemical runoff that burns plants below
- Water forced under shingles and flashing
How we handle roof cleaning for cedar shake roofs
- Check the roof type, pitch and condition from the ground and ladder
- Pre-wet and protect plants and cover sensitive areas
- Apply a soft wash solution suited to the roofing material
- Let it work, then rinse gently or let rain finish the job as recommended
- Rinse gutters, downspouts and plants and check the results
Roof Cleaning for Cedar Shake Roofs cost in Mercer Island, WA
What moves the price:
- Size: square footage of siding, roof or flatwork
- Condition: heavy growth, old stains and peeling finishes take longer
- Access: number of stories, roof pitch, slopes and how close we can park
- Add-ons: sealing, gutter brightening and other services done in the same trip
These are typical U.S. ranges, not a quote. You get an exact price before any work starts. For a quick estimate, try the pressure washing cost calculator.
Other services for cedar shake roofs
Serving Mercer Island, WA and nearby towns
Moss is the number one roof cleaning job in Washington. It holds water against shingles and can lift their edges, so it should be treated with a soft wash and removed gently, never pressure washed off.
Near the coast, salt air leaves a film on siding, windows, screens and railings that dulls finishes and speeds up corrosion on metal. Regular rinsing and washing help protect them.
Besides Mercer Island (ZIP code 98040), we handle roof cleaning for cedar shake roofs in Newport (1.9 mi), Columbia City (2.5 mi), Bellevue (2.9 mi) and Medina (3.5 mi). Call (555) 010-0000 for a free quote in Mercer Island.
Roof Cleaning for Cedar Shake Roofs: frequently asked questions
How much does roof cleaning for cedar shake roofs cost in Mercer Island, WA?
Roof Cleaning for Cedar Shake Roofs typically costs $400-$1,000 for a typical single-story or two-story home, and usually takes 2-4 hours. The exact price depends on the size and condition, and you get it before any work starts. Call (555) 010-0000 for a free quote.
Do you use high pressure for roof cleaning for cedar shake roofs?
For cedar shake roofs: soft wash only. What we avoid: high pressure, which erodes and splits the wood and shortens the roof's life. The cleaning solution does most of the work, followed by a gentle rinse.
Is roof cleaning for cedar shake roofs safe for my plants and pets?
We pre-wet plants and lawns, keep cleaning solutions diluted to what the surface needs, and rinse landscaping again when we finish. Keep pets and children inside until surfaces are rinsed and dry.
How often should I schedule roof cleaning for cedar shake roofs?
Every 2-4 years. Shade, nearby trees, humidity and heavy traffic mean more frequent cleaning; sunny, dry spots can go longer. Our free cleaning frequency tool gives a recommendation for your climate.
What if it rains on the day?
Light rain doesn't stop most washing, but heavy rain, high wind, lightning and freezing temperatures do. If the weather isn't right, we reschedule at no charge. Our work is backed by a satisfaction guarantee.