Roof Cleaning Service in Oregon

Composition shingle runs $300 to $600 and cedar shake $500 to $900, which are average Oregon market rates. Cedar costs more because the work is slower and gentler and uses more product. We quote per roof after assessing pitch, access, moss depth and shingle condition, then lock the figure in writing. Booking a roof clean with gutter clearing lowers the combined total, since shed moss ends up in the gutters anyway.

You can, and it will damage the roof. High pressure strips the mineral granules bonded to asphalt shingles, and those granules are the layer protecting the asphalt from ultraviolet light. Remove them and the shingle ages years in months. Most manufacturer warranties are void after a pressure wash. Roof cleaning has to be a soft wash under 500 PSI where the treatment does the work.

Soft washing is roof cleaning at under 500 PSI, which is gentler than a garden hose held close, where a biodegradable treatment kills moss and algae at the root and the water only carries it away. The moss browns off over the following weeks and sheds with rain and wind. It is the method asphalt shingle manufacturers specify, and the only one that does not shorten the life of the roof.

Not when done by soft wash. Low pressure lifts moss and algae without disturbing the granule layer, which keeps the manufacturer warranty intact. High pressure does cause damage and does void most warranties. Ask any roof cleaning company which PSI they use before booking, because that single answer separates the safe crews from the expensive ones.

Because the wet season runs October to May, which gives moss a nine-month growing window rather than the three or four most of the country sees. North-facing planes, roofs under tree cover and homes near rivers get the worst of it. Moss roots into the granule layer, holds water against the shingle like a sponge and lifts the shingle edge, which is how water gets underneath.

Every two to three years for most Oregon roofs, and annually for roofs under heavy tree cover or with established north-facing growth. A roof treated before the moss thickens costs considerably less than one left until the growth has rooted, because thick moss needs more dwell time, more product and a return visit.

April through October, when the treatment has time to work before rain washes it off. Spring clears the growth built up over winter, and early autumn treats the roof before the wet season starts again. Mid-winter treatment washes off before it can act, so it is the least effective time and rarely worth booking.

They help on the area directly below them and do nothing elsewhere. Zinc works by shedding trace metal into rainwater run-off, which suppresses regrowth on the planes that water crosses. They are a maintenance aid rather than a substitute for cleaning, and they do not remove growth that is already established.

Yes. Apartment blocks, HOA properties, offices and commercial buildings are quoted against a written scope with building count and roof area, then scheduled around occupancy. Photo documentation is provided per building for boards and owners, which matters when a maintenance budget has to be justified.

Yes. GreenTree Services carries $2 million in general liability insurance, and the certificate is available before the crew arrives. Roof work is where that matters most, because a fall from a wet Oregon roof is exactly the claim an uninsured company cannot cover.