Cedar Roof Cleaning

What This Service Involves

Moss and algae are relentless on shaded cedar roofs throughout the Puget Sound, and left alone they trap moisture that accelerates rot and lifts individual shakes. Our cleaning approach relies on gentle, low-pressure techniques and cedar-safe treatments rather than power washing, which can strip the wood and drive water into the courses. We clear needles, leaves, and debris from keyways and valleys so the roof can drain and dry the way it was designed to. Removing the organic growth also opens the surface for any follow-up preservative treatment to penetrate properly. Regular cleaning keeps a cedar roof breathing, draining, and looking its best through our long, wet seasons.

Benefits

Removes moss and algae that trap damaging moisture against the wood; low-pressure methods clean without stripping cedar or forcing water inside; clearing keyways and valleys restores proper drainage; reduces the rot and lifting that shortens a wood roof's life; prepares the surface for preservative treatment to bond and penetrate

Our Process

1) Inspect the roof and identify moss coverage, debris buildup, and any loose shakes; 2) Clear needles, leaves, and debris from courses, keyways, and valleys by hand or blower; 3) Apply cedar-safe cleaning solution and gently remove growth with low-pressure rinsing; 4) Verify drainage paths are clear and recommend a treatment or maintenance schedule.

What Affects the Cost

Roof size, pitch, and safe accessibility for cleaning crews; severity and depth of moss, algae, and organic buildup; whether a preservative or moss-inhibiting treatment is added afterward; overhanging trees that increase debris and future regrowth; protection required for gutters, siding, and landscaping below

Best Time of Year

Schedule cleaning in late spring or early summer to clear winter moss growth and prepare the roof for the dry season.