“Those zinc strips were a letdown for me too, honestly. I thought I’d see some miracle change, but nope, still had that green fuzz creeping back every winter.”
I’ve got to admit, I had a different experience with zinc strips—at least on my south-facing slope. Maybe it’s the angle or how much sun that side gets, but the algae didn’t come back as fast there. The north side though... same story as you, green fuzz city by February. I’m starting to wonder if it’s partly about airflow and shade more than just the product itself.
Cutting back branches definitely helped me too, but I’m always a little cautious with bleach. Even diluted, I worry about runoff into my veggie beds. I’ve been experimenting with a baking soda solution—cheaper and supposedly less harsh on plants. Not a cure-all, but it slows things down for a while.
On the Atlas vs GAF thing, I’m curious if installation plays a bigger role than we think. My neighbor’s GAFs started curling after just five years, but he said his roofer rushed the job. Hard to separate luck from workmanship sometimes.
That’s interesting about the zinc strips working better on your sunny side. I’ve noticed the same thing—my west-facing roof barely gets any algae, but the shady back is a mess every year. I tried the baking soda trick too, and while it’s not magic, it’s definitely less stressful than worrying about bleach near the garden. As for the shingle brands, I’m convinced install matters way more than folks realize. My neighbor’s Atlas shingles are holding up great, but he was picky about hiring someone who took their time. Sometimes it really does come down to who’s up there doing the work.
Yeah, install quality is huge. I’ve seen the same shingles last twice as long just because someone actually took their time and didn’t cut corners. My place has a north-facing section that’s always in the shade, and it’s a magnet for algae. Tried the baking soda too—definitely less nerve-wracking than spraying chemicals near the veggie beds. Zinc strips helped a bit, but only where rain actually runs over them. I guess there’s no perfect fix, just a bunch of little things that help.
- Had the same issue on my north side—shade just makes it worse, right?
- Tried copper wire instead of zinc strips. Not a miracle, but seemed to slow the algae down a bit more.
- Wonder if anyone’s tried those algae-resistant shingles? Pricey, but maybe worth it long-term.
- I’m with you on the baking soda. Less stress than chemicals, but I feel like it needs reapplying after every big rain.
Tried copper wire instead of zinc strips. Not a miracle, but seemed to slow the algae down a bit more.
I’ve seen a lot of folks try copper and zinc, and honestly, results are all over the map. On some roofs, especially with a decent pitch and good airflow, copper wire does help... but if you’ve got heavy shade on the north side, like you mentioned, it’s kind of an uphill battle. Shade plus humidity is just prime real estate for algae.
About those algae-resistant shingles—yeah, they’re pricier upfront, but I’ve installed them on a few jobs where the homeowners were fed up with streaks every couple years. The ones with actual copper granules embedded seem to hold up best, but you’re still looking at a premium. Worth it? Depends how much the look bugs you and how long you plan to stay put.
Baking soda’s an interesting one. I get why folks like it—cheap, not harsh—but rain does wash it away fast. Ever tried mixing in a bit of dish soap? I’ve heard it helps it stick longer, though I haven’t tested that myself.
What’s everyone’s take on pressure washing as a last resort? I know it can void warranties if you’re not careful, but sometimes it feels like the only way to get rid of those black streaks for good...