Extend Your Roof's Life
Roof Cleaning
When you choose Velocity Cleaning Systems for your roof cleaning needs, you are selecting a team of dedicated experts committed to delivering exceptional results. We safely remove moss, algae, and debris to extend your roof's lifespan.
Your Roof vs. The Pacific Northwest
The Puget Sound region is one of the most demanding climates for roofing materials in the country. With 72+ inches of annual rainfall, persistent shade from towering Douglas firs, and mild temperatures that never get cold enough to kill organic growth, moss, algae, and lichen have a 12-month growing season on your roof.
Left unchecked, moss works its way under shingles, trapping moisture against the deck. This leads to rot, granule loss, and premature failure. A roof that should last 25–30 years in a drier climate may only last 15–20 in the PNW without regular maintenance. The cost of a full roof replacement in Washington state averages $10,000–$25,000 — making routine cleaning one of the highest-ROI investments you can make for your home.
Velocity Cleaning Systems uses a low-pressure soft-wash technique with biodegradable treatments that kill moss and algae at the root without damaging your shingles. We service composition, cedar shake, tile, and metal roofing across Snoqualmie, Issaquah, Sammamish, Bellevue, Kirkland, and beyond.
- Moss and algae removal
- Extends roof lifespan
- Prevents costly repairs
- Safe low-pressure techniques
- All roof types serviced
What's Growing on Your Roof?
Not all roof growth is the same, and each requires a different approach. Here's what we commonly find on PNW roofs and the damage each one causes.
Moss
Lifts shingles, traps moisture, causes rot. Thrives on north-facing and shaded roof surfaces. Can double in mass every 6 months in PNW conditions.
Algae (Gloeocapsa)
Creates dark black-green streaks that absorb heat and degrade shingle granules. Spreads airborne from roof to roof across neighborhoods.
Lichen
A moss-algae hybrid that bonds to shingle surfaces. When removed improperly it tears away granules, accelerating aging by years.
Our Soft-Wash Roof Cleaning Process
Roof Inspection
We walk your roof and inspect for damage, vulnerable areas, and the type of growth present before any cleaning begins.
Landscape Protection
All plants, siding, and sensitive areas below the roofline are pre-soaked and covered to prevent any contact with cleaning solutions.
Soft-Wash Application
Our biodegradable solution is applied at low pressure, penetrating moss and algae at the root level. No high-pressure blasting that strips granules.
Dwell & Rinse
The solution dwells to fully neutralize organic growth, then is gently rinsed. Heavy moss is hand-removed where needed.
Prevention Treatment
A zinc-based preventive treatment is applied to inhibit regrowth, extending your results for 12–18 months in typical PNW conditions.
The Cost of Waiting
$15K+
Avg. roof replacement cost
40%
Longer lifespan with cleaning
6 mo
For moss to double in size
1–3 yrs
Recommended cleaning cycle