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No, asphalt shingles should not be power washed. A power washer or pressure washer is too strong to use on asphalt shingles and will loosen the adhesive holding them to your roof, causing them to fall off. It’s best to hire a local roof cleaner to clean those shingles safely and without damaging them. 

For most people, summer is the best season to clean roof shingles. You want a day with dry weather and comfortable temperatures. In hot climates, late spring may work better for washing shingles. Avoid cleaning roof shingles at any time where ice could form from applying water in low temperatures.

You could void your roof warranty using a power washer if you have a newer roof. With an older roof, you could knock loose older shingles. On the other hand, some people safely use a pressure washer to remove moss from a metal roof. Although you may want to use a pressure washer, the truth is that you probably don’t need it to knock moss loose. A garden hose and brush will do the job just fine and in a safer manner than a pressure washer.

Inspections should be conducted annually, and minor repairs should be made as needed.