Good points all around. Stainless screws definitely hold up better, but you're right—they aren't bulletproof. I've had similar issues with aluminum flashing near saltwater. Marine-grade sealant sounds interesting, might have to give that a shot next time I'm up on the roof. Always something new to learn in coastal maintenance...
I've been following this thread and nodding along—salt air is a beast. Stainless screws are definitely better, but I've seen them corrode too, especially if they're not top-grade stainless. Had a client once who insisted on using standard aluminum flashing near the shore because it was cheaper and "good enough"...well, you can probably guess how that turned out. Within two years, it was practically crumbling to dust.
Marine-grade sealant is solid advice, though. I've used it a few times and found it holds up pretty well, especially around chimneys and skylights. But one thing I'd add from experience: make sure you're thorough with prep work. Even marine sealants won't stick properly if there's salt residue or moisture trapped underneath. Learned that the hard way when I had to redo a job because the sealant peeled right off after a season or two.
Speaking of coastal roofing headaches, has anyone experimented with copper flashing or copper-coated materials? Heard mixed things—some swear by it, saying it develops a protective patina that resists corrosion. Others claim it doesn't last as long as advertised near saltwater. I'm curious if anyone here has firsthand experience with copper in coastal environments. Seems like it could either be a great investment or an expensive mistake...
"Speaking of coastal roofing headaches, has anyone experimented with copper flashing or copper-coated materials?"
I've actually looked into copper flashing for my own coastal property. From what I've gathered, the patina does offer decent protection, but it can be pretty inconsistent depending on local conditions—wind exposure, humidity, and even pollution levels can affect how quickly and evenly it forms. I've seen houses nearby where copper held up beautifully for decades, while others turned patchy and corroded surprisingly fast. Seems like a gamble unless you're certain about your specific microclimate...
Copper flashing can be solid, but honestly, stainless steel might be a safer bet near the ocean. I've seen copper go patchy real quick in salty air...looks cool at first, but gets ugly fast if conditions aren't perfect. Stainless holds up better long-term, IMO.
Definitely agree on stainless steel being the better choice near saltwater. I've managed properties right on the coast, and copper flashing tends to develop uneven patina surprisingly fast—sometimes within just a few months. Stainless steel, especially marine-grade (316), has consistently held up better in my experience. It might cost a bit more upfront, but considering maintenance and replacement costs down the line, it's usually worth it.
