Yeah, I hear you on the plant worries. Honestly, I usually just lay out some old tarps over the shrubs and hose everything down before and after. It’s not perfect, but it seems to help—haven’t lost anything yet. Bleach and a brush gets the job done, but I’ve noticed the algae comes back quicker. Those pro washes last longer, but I’m not sure it’s worth the hassle every time. Sometimes I just let a little green slide if it means less stress on the landscaping...
That sounds a lot like what I do, honestly. I’ve tried the bleach and brush route too, but yeah, the algae just seems to laugh and come back faster every year. Do you think the pro washes are really that much better, or is it just marketing? I’m always torn between saving money and not wanting to mess up my plants. Sometimes I wonder if a little green isn’t just part of having a roof in a humid area...
Sometimes I wonder if a little green isn’t just part of having a roof in a humid area...
Honestly, I’ve started to think you’re right. In my experience, especially down here where it’s muggy half the year, some algae just comes with the territory. I’ve managed a few properties where we did the pro wash every other year—yeah, it looked great for a while, but by the next summer the streaks were creeping back. The biggest difference seemed to be how careful they were about runoff and plant protection, not necessarily that their chemicals were magic.
If you do want to minimize regrowth, one thing that’s helped us is installing zinc or copper strips near the ridge. Rainwater carries ions down the roof and slows algae growth. Not a total cure, but it stretches out the time between cleanings. Anyone else tried those? I’m curious if they work as well on older shingles or if there’s a trick to getting them to actually make contact with the rainwater.
- Totally agree, a bit of green just seems inevitable around here.
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—yep, especially on north-facing slopes or under big trees.“some algae just comes with the territory”
- I’ve used zinc strips too. They help, but honestly, older shingles don’t always let the runoff spread evenly. Sometimes you get clean streaks right below the strip and the rest still gets patchy.
- One thing I’ve noticed: if the roof’s already rough or curling, the strips don’t do much. Water just runs off weird.
- At this point, I mostly just budget for a gentle wash every couple years and try not to stress about it... unless it starts looking like a science experiment up there.
Yeah, zinc strips are kind of like putting a bandaid on a leaky boat if your shingles are already curling up. I’ve seen folks get real excited about them, then wonder why they’ve got zebra stripes on their roof. Around here, I just tell people—if you’ve got big trees and shade, a little green is just part of the deal. I’ve tried everything short of hiring goats to graze up there... gentle wash every couple years keeps the neighbors from calling the CDC.