Roof Cleaning FAQ — Anchorage, AK

They're almost always a blue-green algae called Gloeocapsa magma, not permanent staining or soot. It feeds on the limestone filler in asphalt shingles and spreads in the shade and damp. A soft wash clears it and brings back the roof's original color.

Done correctly, yes. The key is low-pressure soft washing rather than high-pressure blasting, which can strip the protective granules off asphalt shingles and force water underneath. Soft washing cleans the roof while protecting the surface.

Pressure washing uses high water pressure to blast off grime, which is too harsh for most roofs. Soft washing uses low pressure plus cleaning solutions to break down algae, moss, and lichen at the source. For roofs, soft washing is the recommended method.

Cost depends on the size, height, and pitch of the roof, the roof type, and how much algae or moss needs clearing. The quickest way to a real number is a free quote — tell us about your roof.

It varies by climate, shade, and roof type, but many homes benefit from a cleaning every few years once streaks or moss start to show. Keeping gutters clear and branches trimmed back helps a roof stay clean longer between visits.

Eventually some regrowth is normal, since the spores are airborne. Soft washing slows it down compared to scrubbing, and optional treatments can help keep a roof cleaner for longer. Reducing shade and moisture on the roof helps too.

Yes — we cover Anchorage, all of the Anchorage Municipality, and nearby Eagle River, Wasilla, and Palmer.