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 holds moisture against the shingles, lifts them, and rots the deck underneath. Our damp, tree-covered north slopes on Orcas and San Juan grow it fast.
We treat moss with the right products and gentle low-pressure methods — never a high-pressure washer, which strips granules and voids shingle warranties. To keep it from coming back, we install zinc or copper strips near the ridge; every rain releases ions that inhibit new moss and algae growth.
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.