Wondering if anyone’s had luck with just changing up airflow or trimming branches instead of adding more stuff to the roof...
Honestly, I’ve had better luck focusing on airflow and shade than any of the chemical or metal strip fixes. I get what you mean about zinc strips—they’re supposed to help, but mine corroded and flaked off after a couple seasons. Didn’t really notice much difference.
I’m in the Pacific Northwest, so moss and algae are just part of life here. North side is definitely worse, but if there’s enough tree cover, it creeps around to other spots too. Trimming back branches made a bigger impact for me than anything else. More sun and wind seem to dry things out faster, which keeps the green stuff from taking over.
I know some folks worry about losing shade and higher cooling bills, but honestly, a little less moss is worth it for me. Plus, less debris in the gutters. Haven’t tried any fancy roof coatings yet—just regular sweeping and keeping things open. Not perfect, but it’s manageable.
- Trimming branches and boosting airflow definitely help, but I’d be careful about relying on that alone, especially in wetter climates.
- Seen a lot of roofs where algae still creeps back even with good sun and wind—especially if the shingles are older or have rougher surfaces.
- Zinc strips can be hit or miss, but copper’s held up better for some folks I’ve worked with. Not cheap, though.
- If you’re dealing with repeat moss/algae after storms, sometimes it’s worth looking at the attic ventilation too. Poor venting can keep the roof deck damp from underneath.
- Regular sweeping’s good, just watch out for granule loss if you’re using stiff brushes... seen more than a few shingles get worn down that way.
- Gotta agree that airflow helps, but yeah, it’s not a silver bullet—especially if you live somewhere muggy. I’ve seen algae set up shop even with plenty of sun if the shingles are rough or getting up there in age.
- Copper strips seem to work better than zinc, but wow, that stuff’s pricey. I’ve had a couple clients try DIY copper wire runs instead… not perfect, but cheaper if you’re handy and don’t mind the look.
- Ventilation gets overlooked all the time. Had a house last spring where the attic was basically a sauna—roof looked fine from the outside, but algae kept coming back. Once they got some ridge vents in, problem slowed way down.
- About sweeping: totally with you on being gentle. Saw a guy out there with a stiff push broom once… let’s just say his roof aged five years in an afternoon.
- If you’re in a spot where storms are regular, sometimes it’s just a losing battle. I tell folks to keep expectations realistic—maintenance helps, but nothing keeps algae off forever. At least not that I’ve seen yet...
You’re spot on about ventilation getting overlooked. I can’t count how many times I’ve walked into an attic and it’s basically a greenhouse in there—folks are always surprised when I tell them that’s half the battle with algae. And yeah, copper strips do work, but that price tag stings. I’ve seen people try to get creative with copper wire too, and honestly, if you don’t mind a little “DIY chic” up there, it seems to help at least a bit.
The thing about storms and humidity is real—down here in the southeast, you can do everything right and still see those black streaks creeping back after a wet summer. Maintenance definitely buys you time, but like you said, nothing’s permanent. I’ve had some luck with gentle roof cleaning (low pressure only), but even then, I warn folks not to expect miracles.
Appreciate your take on being realistic. Sometimes people get sold on “lifetime solutions” and end up disappointed. At the end of the day, it’s just about keeping things manageable and not stressing over every little patch of green.
I had no idea ventilation mattered so much until I moved in and realized my attic basically felt like a sauna. I’ve been eyeing those copper strips, but yeah, my wallet says nope. Is there any trick to getting the copper wire to stay put up there, or does it just kind of lay across the ridge? Also, does anyone else worry about messing up their shingles with all this DIY stuff, or am I just being paranoid? Every time I see those black streaks come back, I wonder if it’s even worth fighting it...