In addition to Ivemectin, I take a Quercetin/Zinc supplement.
ZINC!!
If you ever see a galvanized (zinc!) fixture (vent etc) on an asphalt shingle roof. The area below the fixture looks cleaner. Zinc wards off mold and similar.
________
Zinc strips are metal sheets that are installed onto your roof just below the ridgeline. Zinc is poisonous to algae, moss, lichen, fungus, and mold, making it ideal for keeping those pesky plants off your roof.
Why We Don’t Recommend Using Zinc Strips to Remove Moss
www.ibexroof.com/why-we-dont-recommend-using-zinc-strips-to-remove-moss/