Was installed last year. Not confirmed if it is the proper strip, I see quite a few of these here, and always on the filthiest roof. I liken them to gutter gaurds.....I was asked about them this week also. Isaac, do you know how long that strip has been up? And is it confirmed that it is the proper strip?
Ya I got it. It just sucks seeing these all the time, you know?What I think is going on in your pic Isaac is.... If you look about two feet under it doesnt really have moss. That is where the water/zinc goes down and is sucked up by the moss. Above the zic even though its touching the strp the water goes down after it hits the strip. Not sure if you get my drift?
Suggest you try some Borax or Copper Sulfate vs the Wet and Forget. This is what some use here in Tampa Florida to treat roofs with. That stuff don't work too well on the Tampa Strain of Algae, but we seldom see Moss down here in Tampa.The thin roll out kind do not work in Portland Oregon . They might work if we installed them at the ridge then 4 feet down then four more feet down ect until the roof was an ugly mess of zinc strips and nail holes.
Wet and forget can be sprayed on using your chemical injector on your pressure washer. You will be able to treat moss annually to prevent moss growth without getting on the roof. I offer this for a little extra with annual gutter cleaning.