Roofing near the ocean - did you know salt air eats metal?

“if they still end up rusting, what’s the point?”

That’s exactly what I keep coming back to. I priced out “coastal” metal too and just couldn’t justify it - especially when I see those same rusty streaks on houses down the block. Shingles are a pain after storms, but at least the upfront cost is manageable. I’ve started budgeting for a shingle refresh every 8-10 years instead of hoping for a miracle material. Not ideal, but it feels less stressful than sinking a ton into metal and still worrying about rust. Sometimes it’s just about picking your battles, right?

I get where you’re coming from - every time I see a “coastal” metal roof with orange streaks, I wonder if it’s worth the premium. I’ve inspected a bunch of roofs near the water, and honestly, even the fancy coatings only buy you so much time. Shingles aren’t perfect either, but at least you know what you’re dealing with when a storm rolls through. If someone figures out a truly rust-proof metal, I’ll be first in line... until then, it’s just about picking your poison.

Yeah, those orange streaks are a dead giveaway, aren’t they? I’ve managed a few properties right on the coast and honestly, even the so-called “marine grade” metals need regular rinsing to keep the salt from eating them up. What’s worked best for us is a combo - galvalume panels with a heavy-duty paint, plus a yearly hose-down (not always easy to schedule, but it helps). Shingles do get battered by wind, though, and the granules just don’t last. It’s always a trade-off.

even the so-called “marine grade” metals need regular rinsing to keep the salt from eating them up

That’s been my experience too. Even stainless fasteners will start to pit after a few seasons if you’re right on the water. I’ve had better luck with aluminum gutters, but they still stain. The yearly rinse helps, but it’s tough to keep up with during busy months. For shingles, I’ve noticed the wind-driven rain tends to sneak under the edges more often than inland - flashing details really matter out here.

I’ve actually seen some marine-grade stainless hold up pretty well, but it depends a lot on the alloy and how exposed it is. Type 316 fasteners seem to last a lot longer than 304, especially right near the coast. With gutters, I’ve noticed powder-coated steel can sometimes outlast bare aluminum, but it’s hit or miss. Wind-driven rain is brutal - totally agree on flashing being critical, but I wonder if some of the underlayment options out there could help with that too...

- Gotta say, I’ve seen powder-coated steel fail pretty quick in salty air, especially if there’s even a tiny scratch. Once the coating’s breached, rust creeps in fast.
- Aluminum gutters can pit and look rough, but they don’t usually rust through like steel does. Sometimes ugly, but still functional.
- Underlayment’s helpful, but if the metal fasteners go, water finds a way. I’ve seen synthetic underlayments hold up, but they’re not a cure-all.
- Flashing’s still the MVP in my book... but I’d double-check those fastener specs, especially if you’re right on the coast.

That’s interesting about powder-coated steel - makes me wonder if anyone’s tried those “marine grade” coatings and actually seen them hold up? I’ve only ever seen the standard stuff, and yeah, one scratch and you’re basically inviting rust to the party. With aluminum, I get what you mean about the pitting. My neighbor’s gutters look like they’ve been sandblasted after a few years, but they’re still hanging in there.

About the fasteners - has anyone had luck with stainless or coated screws actually lasting, or do they just end up corroding slower? I’ve seen some roofs where the panels are fine but every single screw head is rusted out after a couple seasons. Makes me wonder if it’s worth the extra cost for the “coastal” hardware packs, or if it’s just marketing.

And with underlayment, I’m curious - does anyone actually see a difference between the synthetic stuff and old-school felt in salty climates? I’ve heard mixed things, but haven’t seen a side-by-side comparison after a few storms.

I’ve been wondering the same about those “marine grade” coatings. The guy who installed my gutters swore by them, but honestly, I already see a couple of rust spots after just two years. Maybe it helps, but I’m starting to think nothing is totally foolproof when you’re this close to the ocean. The salt just finds a way in.

On the fasteners, I paid extra for stainless screws (the ones that were supposed to be “lifetime” rated), but a bunch of the heads are already getting that orange halo. The panels themselves look fine, which is kind of annoying since now I notice every single rusty dot when I pull in the driveway. Not sure if it’s worth paying for the “coastal packs,” or if it’s just a fancier label.

As for underlayment, my roofer pushed synthetic, saying it’s less likely to rot or wrinkle from humidity. But my neighbor went with felt and hasn’t had any issues yet. Maybe it’s more about how good the install is than the material itself? Hard to say - wish there was a real side-by-side after a few storms.

I hear you on the stainless screws - mine started showing those orange halos after a couple years too, even though they were supposed to be the “good” ones. I’m starting to wonder if it’s the grade of stainless or maybe just the way they’re exposed? I went with synthetic underlayment as well, but honestly, I can’t tell if it’s made a difference. My neighbor’s old felt roof is still holding up, so maybe install really is the key. Has anyone actually seen a “coastal pack” that held up better long-term?

- Gotta say, I’m not convinced the “coastal pack” stuff is worth the extra cash. Tried it once - looked fancy, but still got rust spots after a couple seasons.
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“My neighbor’s old felt roof is still holding up, so maybe install really is the key.”

“My neighbor’s old felt roof is still holding up, so maybe install really is the key.”

I keep seeing this too - some of the oldest roofs around here (I’m on the coast in Maine) are just basic materials, but they were put on with real care. I do think install matters way more than people realize. That said, I switched to a green roof system last year (sedum mats over a membrane), and so far zero rust or leaks, plus it keeps the upstairs cooler. Not cheap, but honestly less hassle with salt air.

That’s interesting about the green roof - never actually seen one in person up here, but I’ve read they’re supposed to be really good for insulation. I’m curious, did you have to reinforce your roof structure for the extra weight? I’ve heard that’s a thing with sedum mats, especially if you get a lot of snow on top of it in winter.

About the install vs. materials debate, I keep going back and forth. My uncle’s place has the original rolled roofing from the 70s and it’s still watertight, but he’s super picky about flashing and always re-seals around the chimney every couple years. Meanwhile, my neighbor put on a fancy standing seam metal roof five years ago and already has rust spots near the ridge. Makes me wonder if it’s just the salt air or if something got missed during install - maybe a scratch in the coating or fasteners that weren’t stainless?

Anyone else notice certain metals hold up better than others? I’ve seen some aluminum roofs look almost new after a decade, but galvanized steel seems to pit pretty fast here. Is copper worth the price for coastal spots, or is it overkill? I’d love to hear what people are actually using that lasts - sometimes it feels like every house on my street has tried something different.

Also, does anyone do regular rinsing of their roof to get rid of salt buildup? Or is that just not practical with pitched roofs? I keep hearing mixed things about whether it actually helps or just wastes water.

- Definitely agree about install making a huge difference. I’ve seen metal roofs go bad quick if the fasteners aren’t right or if there’s a scratch in the finish - salt air finds any weak spot.
- Aluminum seems to hold up best around here (I’m on the coast too). Galvanized steel just doesn’t last, especially near the water. Copper looks amazing but yeah, the price is wild. Maybe worth it for a forever home?
- I’ve tried rinsing my own roof a couple times after storms, but honestly, with a steep pitch it’s not easy or super safe. Not sure it made much difference either.
- Maintenance like checking flashing and re-sealing seems to matter more than anything else. The folks who stay on top of that stuff always have fewer problems, no matter what material they use.

I get what you’re saying about maintenance being the big thing, but I’m not totally convinced it’s always enough, especially this close to the ocean. My neighbor’s place is only a few years older than mine, and he’s super diligent about checking flashing and sealing stuff up, but his galvanized roof still started rusting out after like 8 years. Meanwhile, another house down the street with aluminum panels looks almost new, and I doubt they’re up there every season. Maybe some materials just can’t keep up with the salt, no matter how on top of things you are?

Title: Salt Air and Metal Roofs - Material Choice Really Matters

I’ve seen this play out a bunch of times on jobs near the coast. Maintenance is huge, but honestly, some materials just don’t stand a chance against salt air, no matter how careful you are. Galvanized steel is a good example - it’s fine inland, but right by the ocean, it’s almost like the salt finds every weak spot. I remember working on a duplex about 300 yards from the beach. Both units had galvanized roofs installed around the same time, and both owners were pretty meticulous about upkeep. By year seven or eight, rust was showing up in weird spots - edges, fasteners, even some flat sections where water pooled after storms.

Meanwhile, there was an older house across the street with aluminum panels that looked almost untouched. The owner told me he barely did anything besides clearing off leaves now and then. It’s not just luck - aluminum doesn’t react with salt the same way steel does. Even stainless steel can have issues if it’s not the right grade (304 vs 316 makes a difference), but aluminum holds up better in salty environments.

I get why people go for galvanized - it’s cheaper up front and easy to find - but if you’re within a mile or two of the ocean, it’s kind of fighting a losing battle. Paint systems help a bit, but once there’s any scratch or exposed edge, corrosion sets in fast. I’ve also seen some folks try zinc coatings or special sealants, but those only buy you time.

It’s not just about metal either - fasteners matter too. I’ve seen roofs where the panels were fine but all the screws rusted out and started leaking. Stainless or coated fasteners are worth every penny near saltwater.

Bottom line, maintenance helps slow things down, but material choice is huge when you’re dealing with salt air. Sometimes spending more up front saves you from replacing everything way sooner than you’d expect... Learned that one the hard way after having to redo a roof I thought would last twice as long.

That’s spot on about the fasteners - my neighbor’s roof looked fine from the street, but up close, the screws were rusted to bits after just a few years. I totally get the temptation to save money with galvanized, especially when you’re already stretched thin with coastal property costs. Still, after seeing how quickly the cheaper stuff can fail, I’m starting to think the extra upfront cost for aluminum or better-grade stainless is worth it in the long run. Maintenance only goes so far when the salt’s relentless... tough lesson for sure.

I hear you on the sticker shock for stainless or aluminum fasteners, but after a couple rounds of roof repairs, I’m not convinced the “cheap now, pay later” plan is worth it. My place is about four blocks from the water, and I went with galvanized the first time. Looked fine for maybe three years, then I started noticing brown streaks down the siding - yep, rust from the screws. Tried to stay on top of it with touch-ups, but honestly, the salt air just doesn’t quit.

Second go-round, I bit the bullet and paid for marine-grade stainless. Not cheap, but I haven’t seen a single fastener rust in five years. If you’re already up on a ladder every year scraping and sealing, it’s just not worth the hassle. One thing I’d add: make sure whoever’s installing knows to use the right washers too. I learned the hard way that a stainless screw with a bargain-bin washer still means leaks.

If you’re close to the ocean, shortcuts just seem to come back and bite you. Still, I get wanting to save a buck - just depends how much you like climbing roofs, I guess...

I get the argument for stainless, but I’ve had decent luck with hot-dipped galvanized if I keep up with yearly maintenance. My place is about a mile from the coast, so maybe that extra distance helps. The upfront savings were significant, and I don’t mind touching up every couple years. Not saying it’s perfect, but for folks who don’t mind a little upkeep, it might be a reasonable tradeoff. Stainless is great, just not always in the budget.

I hear you on the budget side - stainless was just too much for me, too. I’m about three blocks from the water and my galvanized stuff started rusting after maybe four years, even with touch-ups. What kind of paint or sealant are you using for maintenance? I’ve tried a couple brands but nothing seems to last more than a season or two.

What kind of paint or sealant are you using for maintenance? I’ve tried a couple brands but nothing seems to last more than a season or two.

Honestly, I’m starting to think most of those “marine grade” paints are just marketing. I used Rust-Oleum’s oil-based stuff last year and it looked solid for about eight months, then the rust crept back in around the seams. Are you sanding down to bare metal every time, or just spot prepping? Wonder if powder coating would hold up better, but that’s not exactly cheap either.