- Twice a year is solid advice, but I’ve seen it depend on your roof’s pitch and local weather.
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“Zinc strips are hit or miss—chemically, they’re less effective than copper, especially over time.”
Agree here—copper’s pricier but holds up better, especially after a couple seasons of heavy rain.
- If you’re in a spot with lots of tree cover or damp winters, you might even need to check things more often.
- Tried skipping a season once...regretted it when I had to deal with moss thick enough to slow down runoff.
- Ventilation helps, but only if you don’t already have leaks or insulation issues.
- For anyone thinking about pressure washing—be careful. It can do more harm than good if your shingles are older or brittle.
You’re spot on about the pressure washing—seen way too many folks try to blast moss off and end up shredding their shingles. It’s tempting, but unless you’ve got newer materials, it’s risky. I’m with you on copper strips too; they’re not cheap, but they actually last. Around here (Pacific NW), skipping a season is just asking for trouble with all the rain and tree debris. Twice a year’s a good baseline, but honestly, if you’ve got a low pitch or heavy shade, sometimes you just have to check more often. Maintenance always feels like a pain until you’re dealing with leaks... then it’s a whole different headache.
Couldn’t agree more about the pressure washing—seen too many folks ruin perfectly good roofs thinking they’re just cleaning off moss. Copper strips are pricey up front, but they’re worth every penny in the long run. In the PNW, skipping a season is just asking for leaks, especially with all the shade and rain. Twice a year’s smart, but I’ve seen some roofs that need even more attention if they’re under big trees. Maintenance is a pain, but repairs are a nightmare.
Pressure washing’s like using a sledgehammer to crack a walnut—sure, the moss is gone, but so are half your shingles’ granules. I’ve seen folks go from “just a little cleaning” to “hello, insurance claim” in one afternoon. Around here (western WA), twice a year is usually enough unless your house is basically in a forest. Copper strips are magic, but yeah, they’ll dent the wallet upfront. Still beats patching leaks during a January downpour... trust me, that’s no fun.
Pressure washing can do more harm than good, especially on older shingles. I’ve inspected roofs where the granule loss was obvious after just one aggressive cleaning. Moss is a pain in the northwest, but gentle removal and copper strips are a safer long-term bet. The upfront cost stings, but it’s nothing compared to water damage repairs mid-winter. Twice a year checks seem about right unless you’re under heavy tree cover—then you might need to bump it up.
