I have a an at leat 25 year-old ashphalt shingle roof on the house I recently purchased. There was moss growth, not real bad, in between and on the bottoms of the shingles on a few of the roof slopes. I applied roof moss killer product (Lillys Roof Moss-Out) or something like that. It was the liquid concentrate that you mix with water then spray onto the moss with a pump sprayer. I waited several weeks, per the directions, for the moss to start dying, then went up and meticulously and carefully scraped the remaining semi-dead moss off of the shingles with a putty knife.
Now I want to do something to help prevent re-occurence of moss growth, so am considering installing those roof zinc strips along the roof ridges which you can get in 50-100’ rolls from the hardware store. Was researching them a little, wondering how effective they might really be, and of course came up with conflicting info, some saying its the way to go, some saying no that because they are flat and smooth and thin and can cup and thus the rainwater that leeches off them will not be evenly distributed so you’ll still end up with moss, so they’re not a good solution. Also, from what I read in the installation instructions they usually want you to nail the strips onto the roof through the shingles with ring-shank neophrene-washered roofing nails. But I don’t know if I would be comfortable with nailing through the roof, even with the neophrene washers, for fear that creating nail holes through the roof regardless is just asking for water leakage.
Any comments on the effectiveness of these zinc strips, and/or tips on the best installation technique? thanks