Roof Washing (Soft Wash) in Bellevue, WA

Roofs in Bellevue pick up moss and algae fast — the region's wet, mild Pacific Northwest climate and the long fall-to-spring rain season keep shaded roof sections damp for long stretches, which is exactly what moss needs to take hold between the shingles.

A soft-wash method uses low pressure — well below what a standard pressure washer produces — combined with a roof-safe cleaning solution to kill growth at the root, rather than blasting it off the surface. High-pressure washing on a roof can lift and crack shingles, drive water under flashing, and void a shingle manufacturer's warranty, which is why soft washing is the standard method for asphalt shingle roofs.

The cleaning solution is applied, given time to work into the growth, and then rinsed at low pressure. Because it kills growth at the root rather than just knocking visible buildup off the surface, a soft wash also slows how fast staining comes back compared to a plain water rinse.

Besides moss, soft washing addresses general dirt buildup. Gutters and downspouts are often cleaned as part of the same visit since the runoff from a roof wash tends to carry debris into them.

A soft-washed roof looks better immediately and holds up better over the following year than a roof left untreated. Call for an on-site look and a firm quote — roof size, pitch, and the extent of the growth all factor into pricing.