That monthly blower routine is honestly underrated—sometimes the simplest approach just works, especially with all the humidity down here. I’ve seen those black streaks too, and zinc or copper never seemed to make much difference for me either. As for the algae-resistant shingles, I’ve looked into Atlas and a couple others. The granules are supposed to have copper embedded, but in high-humidity zones, it’s still a bit of a gamble. Haven’t seen any dramatic improvement on my neighbor’s roof after three years, but at least the streaking seems slower. If you’re already keeping up with maintenance, you’re probably ahead of most folks around here.
If you’re already keeping up with maintenance, you’re probably ahead of most folks around here.
Couldn’t agree more. I’ve watched three houses on my block get those “algae-resistant” shingles put on in the last five years, and honestly, the results are all over the place. My neighbor across the street swore up and down that the copper granules would solve everything, but he’s still got faint streaks—just not as dark as before. Maybe it’s slowing things down, but it sure isn’t stopping it.
I tried the zinc strip thing a few years back, thinking it was going to be a magic fix. Installed it right at the ridge, just like the instructions said. First rain, I felt like a genius... until about six months later when the streaks crept back in. Maybe it helps a little, but with this swampy Louisiana air, I think algae just laughs at us.
That monthly blower routine you mentioned is huge. I didn’t think much of it until I skipped a couple months and noticed how fast debris built up. Once that stuff sits, it’s like an open invitation for algae and moss. It’s not glamorous work, but it’s kept my 15-year-old shingles looking better than most on my street.
Funny thing is, my cousin up in Tennessee barely even thinks about roof algae. He asked why I was so obsessed with roof streaks—guess he hasn’t had to deal with humidity thick enough to swim through. Goes to show how much climate plays into this stuff.
Anyway, if you’re keeping up with regular cleaning and not expecting miracles from the “algae-resistant” label, you’re doing about as well as anyone can down here. Sometimes it’s just about staying one step ahead of the green stuff... or at least not letting it win completely.
That’s pretty much been my experience too. I put down the so-called algae-resistant shingles about six years ago, and while they did help a bit at first, those streaks started showing up again after a couple of seasons. What’s made the biggest difference for me is staying on top of debris—every few weeks I’ll get up there with a leaf blower and clear things off. Not glamorous, but it keeps the roof looking halfway decent. The zinc strips didn’t do much for me either... maybe we’re just fighting a losing battle with this humidity, but at least regular cleaning slows it down.
I get what you’re saying about regular cleaning helping, but I’ve actually had better luck with zinc strips than you did. I’m in a pretty humid area too, but after I installed a wider strip (about 6 inches instead of the usual 2-3), it made a noticeable difference—especially on the north side. Maybe it’s a placement thing? I do agree, though, nothing seems to be totally maintenance-free when it comes to algae around here. Those “algae-resistant” shingles definitely don’t live up to the hype long-term.
I’ve noticed the same thing with the “algae-resistant” shingles—they look good for a couple years, but after that, the streaks start creeping back in, especially on the shaded sides. I’m with you on the zinc strips, though. The width really does matter. I’ve seen folks try to save a few bucks with those narrow ones and then wonder why they’re not seeing results. Six inches is definitely more effective, especially if you’ve got a low slope or lots of overhanging trees.
Placement’s huge too. If the strip isn’t close enough to the ridge or if it’s blocked by debris, you lose a lot of that runoff effect that’s supposed to kill off the algae. I’ve even seen some people double up—zinc at the top and copper lower down—but honestly, nothing’s truly set-and-forget in a humid climate. Regular maintenance is just part of the deal.
One thing I’d add: make sure gutters are clear so water actually washes over the strips. Otherwise, you’re not getting the full benefit. Just my two cents from what I’ve seen on job sites around here...