In general, we recommend having your roof washed every 1-2 years. If your roof is in the last few years of its lifespan or you have a lot of overhanging tree branches, it should get washed at least once a year.
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In general, we recommend having your roof washed every 1-2 years. If your roof is in the last few years of its lifespan or you have a lot of overhanging tree branches, it should get washed at least once a year.