Ditto on the zinc
I am having a new roof put on starting tomorrow. Old roof had mega moss, looked like a forest floor.
Roofer said zinc strips would help, rain water hits the zinc, washes down the roof and kills the moss.
Also said my moss was due to moisture (stream right behind house, <10 yards) and trees that overhang or close to overhanging, not letting the sun hit roof and dry out. Same problem in back yard on ground: always damp and moss covered.
I am going to have some trees removed.
I would be careful with any pressure washing. Regular house pressure would probably be best.
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