Careful if you pressure wash! The power can damage your shingles.
"The most effective method of cleaning algae and moss from a roof is with a 50:50 mix of laundry strength liquid chlorine bleach and water. Apply with a sprayer and allow the solution to dwell on the roof surface for 15 to 20 minutes, and then rinse thoroughly with low pressure water."
"use a long-handled soft-bristle scrub brush to remove the moss from the roof, scrubbing from the top down to avoid lifting shingles. As you continue, rub gently—don't scrape, scour, or pound on theroof—and work in one small section at a time to avoid ripping, cracking, or breaking the shingles."
Bob Vila
Installing zinc, copper strips or wires will keep it from growing back. Here's a page on various products:
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Spray with a moss killer, but beware of over spray........
Careful if you pressure wash! The power can damage your shingles.
"The most effective method of cleaning algae and moss from a roof is with a 50:50 mix of laundry strength liquid chlorine bleach and water. Apply with a sprayer and allow the solution to dwell on the roof surface for 15 to 20 minutes, and then rinse thoroughly with low pressure water."
https://www.asphaltroofing.org
"use a long-handled soft-bristle scrub brush to remove the moss from the roof, scrubbing from the top down to avoid lifting shingles. As you continue, rub gently—don't scrape, scour, or pound on theroof—and work in one small section at a time to avoid ripping, cracking, or breaking the shingles."
Bob Vila
Installing zinc, copper strips or wires will keep it from growing back. Here's a page on various products:
https://www.google.com/search?rlz=1C1AOHY_enUS708US708&q=copper+wire+for+roof+moss&sa=X&ved=0ahUKEwjppazileTWAhXrslQKHZwSDM4Q1QIIlQIoAg
What kind of roof, shingled, metal, ????? Metal roof, power wash it, Shingles, not sure.
We used a product called Wet it and Forget it. You spray it on and leave it on. It worked great on our roof.
https://www.bobvila.com/articles/how-to-remove-moss-from-roof/