Roof Cleaning in Mercer Island, WA

Roofs on Mercer Island, both houses and commercial buildings, are cleaned by crews from our Redmond office using low pressure and eco-friendly products. A free estimate takes place on site.

Call (425) 353-6368 for a free on-site estimate.

Moss on roofs, according to two Extension sources

An Oregon State University Extension article on roof moss begins “In the moist Pacific Northwest” and continues, “moss on roofs is inevitable”. It adds that moss “doesn’t directly damage roof materials” on its own, yet moss “also attaches to asphalt and metal roofs” and, there, “can lift shingles” and let water “penetrate and damage underlying layers.” The Washington State University demossing manual says “Most moss problems occur under or very near the roof eaves.” It also says moss, lichens and algae “are highly successful in cool, damp climates.” These are regional statements from the universities, not findings about any roof on the island.

Schools and the library

The Mercer Island School District lists six schools. Mercer Island High School is at 9100 SE 42nd St., Islander Middle School at 7447 84th Ave SE, and Island Park Elementary at 5437 Island Crest Way. Lakeridge Elementary is at 8215 Southeast 78th St., Northwood Elementary at 4030 86th Ave SE, and West Mercer Elementary at 4141 81st Ave SE. The King County Library System’s Mercer Island branch is at 4400 88th Ave SE.

How a roof job goes

Roof questions from the island