If you have asphalt shingles, don’t pressure wash your roof. High pressure can knock loose the granules that form the protective surface of the shingles. The Asphalt Roofing Manufacturers Association advises against pressure washing asphalt shingles.
At Osborne Pro Wash, we apply a professional cleaning solution at low pressure to kill the algae and moss. Moss can cling tightly to the shingles even after it dies. Think of pulling a weed out of your garden. The roots can bring dirt up with them. In the same way, forcing moss off the roof before it loosens can pull granules off the shingles. We give the dead growth time to dry out and break down so rain and wind can carry it away.
An asphalt-shingle roof after soft washing.
When you call a company for a roof cleaning quote, ask how they’ll clean your shingles. If they mention pressure washing your shingles, don’t hire them. Call another company that offers soft washing, like Osborne Pro Wash.
Osborne Pro Wash is based in Morrow, Ohio. Get a free quote at OsborneProWash.com.