Sometimes I wonder if moss is just nature’s way of telling us to replace our roofs sooner...
That line made me laugh—feels like my roof’s been sending that message for years. I’ve got a 1950s rambler with a low-pitch roof, and the shade from the neighbor’s giant cedar doesn’t help. Tried zinc strips too, but like you said, they’re not magic on flatter roofs. The moss just shrugs and keeps growing.
I did the bleach thing once, but it left streaks down the siding and toasted a patch of ferns. Never again. These days I use a pump sprayer with diluted potassium salts (found it at the hardware store as “moss killer”), which seems gentler on everything except the moss itself. It takes a couple weeks to see results, but at least my plants survive.
One thing I learned: don’t bother scrubbing unless you want to speed up shingle wear. I just let the rain wash off dead moss after treatment. Still, like you said, it’s never really gone—just biding its time until next spring.
That’s pretty much my experience too—moss just laughs at zinc strips on a low slope. I’ve got a 60s ranch with a similar setup: big trees, lots of shade, and a roof that never really dries out in winter. Tried the bleach route once and regretted it. The runoff left weird marks on the gutters and nuked a whole patch of hostas. Lesson learned.
I switched to potassium salts last year after reading about it here, and it’s definitely less harsh. Takes patience, but at least I’m not killing everything else in the yard. I agree about scrubbing—did that once and ended up with a handful of granules and a guilty conscience. Now I just let the rain do its thing.
One thing I’ve noticed: keeping the gutters super clean seems to help a bit with moss along the edges. Not a cure, but maybe slows it down? Still, like you said, it always comes back. Northwest roofs just have to put up with a little green, I guess.
I’m with you on the gutters—keeping them clear seems to help, especially along the drip edge where moss loves to hang out. I’ve got a similar setup (old roof, lots of shade), and I noticed that trimming back overhanging branches made a small difference too. Not a fix, but it lets a bit more sun and wind hit the roof. I tried zinc strips once and honestly, didn’t notice much change either. Potassium salts are less scary for the plants, but yeah, it’s a slow process. Guess we’re just managing the green, not eliminating it.
I hear you on the moss—seems like it’s just part of life if you’ve got shade and an older roof. But I’ll admit, I’m not totally sold on the potassium salts. Maybe it’s just my luck, but after a couple rounds, I felt like the moss was just laughing at me and inviting its friends over. I actually had better luck with a stiff brush and a little elbow grease (plus a sturdy ladder and a prayer). Not glamorous, but it was cheap and didn’t mess with my garden beds.
I know everyone swears by zinc strips, but for me, they were more like expensive roof jewelry than an actual solution. Maybe it depends on the rain patterns or how steep your roof is? Mine’s pretty low-pitch, so maybe the water doesn’t run off fast enough to spread the zinc.
Trimming branches definitely helped with airflow, though. I just wish there was a magic fix that didn’t involve climbing up there every spring... or shelling out for a new roof.
I know everyone swears by zinc strips, but for me, they were more like expensive roof jewelry than an actual solution.
Honestly, I’ve seen the same thing with zinc on low-pitch roofs. The runoff just isn’t enough to distribute it well, especially if you’re not getting steady rain. If you’re not keen on chemicals, sticking with manual removal and keeping debris off is about as good as it gets. Trimming branches makes a bigger difference than people think—less shade, less moss. There’s no real magic bullet, unfortunately. Just a lot of routine and a bit of sweat.