Copper runoff’s definitely not a “nothing” issue—my neighbor’s kale patch got totally roasted under his eaves after he put up copper strips. He thought it’d be fine since the plants were a few feet out, but nope, those leaves got weird spots after every big rain. I’m with you on zinc being a bit gentler, though I ended up going a different route and put in a living roof over my porch. No algae, no runoff headaches, and honestly, it looks pretty cool. Not everyone has the setup for that, but it’s been a game changer for me.
Copper strips are handy for algae, but yeah, I’ve seen some real plant carnage from the runoff too. I inspected a place last spring where the homeowner’s flower beds right under the drip edge were just toast—looked like chemical burns after every rain. Zinc seems to do less damage, but it’s not totally risk-free either if you’ve got sensitive plants close by. I like the living roof idea, though. Not something I see often in my area, but it definitely solves a few problems at once.
Copper strips are handy for algae, but yeah, I’ve seen some real plant carnage from the runoff too.
You’re spot on about the collateral damage from copper. I’ve run into similar situations—especially where folks have invested a lot in landscaping right under the eaves. It’s a trade-off that doesn’t always get mentioned. Zinc’s a bit gentler, but like you said, it’s not foolproof. The living roof concept is interesting, though. Not common around here either, but I’ve seen a couple projects where it worked surprisingly well for both algae and runoff issues. Definitely worth considering if someone’s up for the extra maintenance.
The living roof concept is interesting, though. Not common around here either, but I’ve seen a couple projects where it worked surprisingly well for both algae and runoff issues.
Funny you mention living roofs—I helped patch up one after a hailstorm last year. The owner swore by it for keeping the shingles underneath in better shape, but the upkeep was no joke. Between weeding and making sure drainage didn’t back up, it was almost a full-time hobby. Has anyone tried those newer composite shingles that claim to resist algae without any metal strips? Curious if they actually hold up or if it’s just marketing.
I’ve seen those composite shingles advertised but haven’t tried them yet—my neighbor did last fall. He says they look clean so far, but it’s only been through one wet season. I’m skeptical they’ll stay algae-free long-term without some kind of copper or zinc. Anyone actually had them up for a few years? I’m in a pretty humid area and algae’s relentless here, so I’m curious if it’s worth the switch or just another gimmick.