San Juan Islands roofing
Moss Treatment & Roof Cleaning in the San Juan Islands
Kill the moss, protect the roof — the PNW way, without a pressure washer.
Moss is the number-one roof killer on shaded island roofs. It traps water against the shingles, lifts them, and rots the deck below. Our damp, tree-shaded north slopes on Orcas and San Juan grow it fast.
We treat moss with the right products and gentle low-pressure methods. We never use a high-pressure washer — it strips granules and voids shingle warranties. To keep moss from coming back, we add zinc or copper strips near the ridge. Every rain releases ions that stop new moss and algae.
The island difference
Under Orcas’ firs, moss is a when-not-if problem. A yearly treatment costs a fraction of the deck rot it prevents.
What’s included
- Low-pressure, granule-safe cleaning (no pressure-washing shingles)
- Targeted moss & algae treatment
- Zinc / copper ridge strips to prevent regrowth
- Gutter clearing & debris removal
- Annual maintenance plans for shaded roofs
Typical island range
$400–$1,600
Gentle treatment + cleaning for an average roof. Heavy moss, steep pitch, and multi-story access raise the range.
General estimate for a typical island home — not a quote. Inspections & written estimates are free.
Where we do it
Moss Treatment & Roof Cleaning across San Juan, Orcas, Lopez & Shaw Islands — plus the outer islands of San Juan County.
