Finally tackled that metal edging thing on my roof

I get the paranoia, especially with older metal roofs. I’ve managed a few properties with roofs pushing 30 years, and I’ve seen those hybrids used in all sorts of ways - sometimes they hold up, sometimes not so much. The biggest issue I’ve run into is that on older metal, especially if there’s any rust or the paint’s chalked up, the hybrid sealants don’t always bond like they’re supposed to. You might get a good seal for a year or two, but after a couple freeze-thaw cycles, I’ve seen them start to peel at the edges or just turn into this sticky mess that collects dirt and looks awful.

One thing I’ve noticed: if you’re dealing with a roof that’s already got some movement (panels flexing, fasteners loosening), the hybrids seem to struggle more. They’re flexible, but not miracle workers. I’ve had better luck with butyl tape under the flashing, then a bead of hybrid on top - sort of a belt-and-suspenders approach. It’s not pretty, but it’s kept water out longer than just the sealant alone.

Winter’s the real test. Last year, after a brutal cold snap, I checked a spot where we’d used hybrid on an old ridge cap. The sealant was still there, but it had shrunk back from the metal, leaving a tiny gap. Not enough for a flood, but enough to let in wind-driven rain. Had to scrape it out and redo it in the spring. Annoying, but better than a full replacement.

If you’re set on using hybrids, prep is everything. Wire brush, clean with alcohol, make sure it’s bone dry. Even then, I’d plan on checking it every year, especially after a rough winter. I wouldn’t trust it to be “set it and forget it” on anything older than 10-15 years. Newer roofs, maybe, but the old stuff just doesn’t play nice with modern goop.

Curious if anyone’s found a hybrid that actually lasts more than a couple seasons on old metal. I haven’t, but maybe I’m just unlucky...

That’s been my experience too - hybrids just don’t seem to last on old metal, no matter how careful you are with prep. I’ve had better luck layering butyl tape and then a thin bead of sealant, like you mentioned. One thing I’d add: if there’s any hint of rust, I’ll hit it with a rust converter first. Not perfect, but it seems to help the bond a bit. Still, annual touch-ups are pretty much unavoidable on anything over 15 years old in my climate (lots of freeze-thaw). It’s a pain, but beats chasing leaks all winter.

That layering method with butyl tape really does seem to be the most forgiving on older metal, especially when you’re dealing with years of patchwork repairs. I’m with you on the rust converter - skipping that step has bitten me a couple times, especially in spots where water pools up after a thaw. One thing I’ve started doing is lightly sanding the area even after using the converter, just to make sure there’s no loose scale left. Not sure if it’s overkill, but I figure every bit helps.

Annual touch-ups are definitely the norm here too (Midwest winters, so I know the freeze-thaw pain). Sometimes I wonder if it’s worth trying those newer self-leveling sealants, but I’ve had mixed results - the flexibility sounds good in theory, but they seem to peel faster on really old roofs.

Out of curiosity, has anyone tried priming the metal after rust conversion and before the butyl? I keep seeing conflicting advice on whether that helps or just creates another layer for things to fail. Always feels like a balancing act between over-prepping and just getting the job done before the next storm rolls in...

I’ve wondered about the primer step too, especially since every extra product adds to the cost and time. Has anyone noticed if priming actually makes a difference in how long the butyl holds up? I’m always torn between following all the steps and just sticking with what’s worked before. Also, does skipping primer ever cause issues with adhesion, or is it mostly just a peace-of-mind thing? My budget’s tight, so I hate buying stuff that doesn’t really help in the long run.

Has anyone noticed if priming actually makes a difference in how long the butyl holds up?

I’ve done both - primed and unprimed - on different sections over the years. Honestly, on clean metal, I didn’t see a huge difference in adhesion at first, but after a couple seasons, the primed spots looked better. That said, if you’re working with new, clean metal and you’re careful with prep, skipping primer hasn’t bitten me yet. But if there’s any dust or oxidation, primer really does help. I get the budget thing... sometimes it feels like these “extra” steps are just peace of mind, but they can save you hassle down the road.

if you’re working with new, clean metal and you’re careful with prep, skipping primer hasn’t bitten me yet. But if there’s any dust or oxidation, primer really does help.

I’ve seen the same thing on a lot of jobs - primer isn’t always “required,” but it’s one of those steps that can make a difference in the long run. I get why people skip it, especially if the metal looks spotless and you’re trying to save a few bucks. But honestly, even when metal looks clean, there’s often some invisible residue or micro-oxidation that you just can’t see. That’s where primer earns its keep.

I’ve inspected roofs where butyl started peeling up after a couple years - almost always on unprimed spots, especially on north-facing edges where moisture lingers. The primed sections just seem to hold their seal better over time. It’s not dramatic at first, but fast forward through a couple freeze-thaw cycles and you’ll notice.

If you’re already up there doing the work, I’d argue it’s worth the extra step. Not saying it’s a magic bullet, but it does stack the odds in your favor for longevity.

Had a similar debate with myself last fall when I was patching up the shed roof. I figured the metal looked clean enough, but ended up priming half and skipping the other half just to see. Sure enough, after one wet winter, the primed side still looks tight, but there’s already a tiny lift on the unprimed edge. Not a huge deal yet, but I’m kicking myself for not just doing it all at once... sometimes those “extra” steps are worth it.

That’s a classic one - always tempting to skip steps when you’re in the thick of it, especially if things look clean. I’ve done the same with flashing on my garage, thinking “it’ll hold.” A year later, rust started creeping in right where I cut corners. Live and learn, I guess. At least you’ve got proof for next time, and honestly, a tiny lift after a wet winter isn’t the end of the world.

Cutting corners on flashing is one of those things that always comes back to bite, even if it looks fine at first. I’ve seen so many roofs where a little shortcut led to way bigger headaches down the line - water finds every weak spot, especially after a couple freeze-thaw cycles. Honestly, I get the urge to skip steps when you’re tired or the weather’s turning, but every time I’ve inspected a “quick fix,” it’s cost more in repairs later. Even a small lift can let in enough moisture to start rot or rust, and then you’re chasing leaks for years. It’s not the end of the world, but it’s never just cosmetic either.

- Been there with the temptation to just get it done, especially when the weather’s turning.
- Did a quick patch job on my shed roof last fall - regretted it as soon as spring rains hit.
- Metal edging’s one of those things that looks minor but makes a huge difference.
- If you skip caulking or don’t overlap right, water sneaks in and you won’t notice until there’s staining or worse.
- I always double-check the corners now... learned that lesson after chasing a mystery leak for months.
- Not saying every shortcut is a disaster, but with flashing, it’s just not worth it.

Metal edging really does seem like one of those “small detail, big headache if you skip it” kind of things. I just finished my first attempt at it this spring - took way longer than I thought, but I kept hearing stories about leaks and water damage from neighbors who rushed through or skipped steps. The corners were the trickiest part for me, too. I probably spent half my time just fussing over those, making sure everything overlapped right and the caulk was solid.

I get the temptation to cut corners, especially when you’re racing the weather. But after seeing what a little water can do to plywood and insulation, I’m glad I took my time. Not sure if I went a bit overboard with sealant, but better safe than sorry, right? It’s kind of wild how something as simple as flashing or edging can make or break your roof’s lifespan.

Anyway, thanks for sharing your experience - it’s reassuring to know I’m not the only one who’s learned these lessons the hard way.

Corners are always the spot that trip people up, honestly. Even after years of doing this, I still double-check my overlaps and sealant at every joint - one missed spot and you’re dealing with rot or mold down the line. You’re right about the temptation to rush, especially if there’s rain in the forecast. I’ve seen folks slap on edging in a hurry and end up with water sneaking in behind their fascia boards... not fun to fix.

Going heavy on the sealant isn’t the worst thing, though sometimes too much can actually trap moisture if it’s not applied right. I usually tell people to focus more on clean, consistent beads and making sure everything’s pressed tight. The real trick is getting those metal pieces to sit flush at the corners - sometimes I’ll even pre-bend them a bit just to get a tighter fit.

It’s wild how something that looks so minor can be the difference between a dry attic and a soggy mess. You did yourself a favor by taking your time, even if it felt like overkill.

Corners are the bane of my existence, honestly. I thought I was being paranoid spending half a Saturday fussing over the back corner of my garage roof, but after reading this, I’m glad I did. The first time I tried to do it “by the book,” I ended up with a tiny gap that let water sneak in during a storm. Didn’t even notice until the paint started bubbling on the inside wall a few months later. That was a fun surprise.

I get what you’re saying about sealant - there’s this urge to just glob it on and hope for the best, but that can backfire. Too much and you’re basically making a little dam for water to sit behind, which is exactly what you don’t want. What worked for me was running a thin bead, then smoothing it with my finger so it really gets into every nook. It’s messy, but at least you know it’s sealed.

Pre-bending the metal is something I wish I’d done from the start. My first go-around, I just tried to muscle it into place and ended up denting one piece so bad I had to replace it. Now I lay everything out on sawhorses and give the corners a gentle bend before climbing up there. Makes a world of difference getting things flush.

It’s wild how much time you can spend on something that looks so minor from the ground. My neighbor laughed at me for “overthinking” it, but he’s already got algae streaks under his eaves... not trying to be smug, but sometimes slow and steady really does win out.

If anyone else is dealing with older wood fascia like mine (mine’s original from the 70s), don’t skip priming those ends before putting metal over them. Learned that lesson after finding soft spots last year - primer and patience go further than any amount of caulk in my experience.

Anyway, glad to see other folks taking their time with this stuff. It’s not glamorous work but man, does it pay off when you hear rain pounding and know you’re not going to wake up to a puddle in your attic.

That bubbling paint thing happened to me too, except I didn’t catch it until the drywall started crumbling. I totally agree about priming old fascia - skipped it once and paid for it with rot. It’s wild how those “little” corners end up being the biggest headaches.

Man, it’s always the spots you think are “no big deal” that come back to bite you. I skipped priming a fascia board once and ended up replacing the whole section after two winters. At least now I pay more attention to those details... even if it takes longer.

That’s rough, but honestly, I get it. Sometimes I wonder if the little shortcuts are ever worth it… but then again, who hasn’t just wanted to get it done and move on? Did you notice the fascia board starting to go right away, or did it sneak up on you? I always worry I’ll miss something small and pay for it later. Still, learning the hard way seems to make those lessons stick. At least you caught it before it got worse.

That’s honestly my biggest fear too - thinking I’ve caught everything, then months later realizing I missed a spot and it’s turned into a headache. Had something similar with my back porch last year… figured a quick patch would hold, but nope, water found its way in and warped a couple boards before I even noticed. You’re right though, those “learn the hard way” moments stick with you. At least you caught it before it became a major repair job. Sometimes just getting in there and fixing it yourself is the best way to really see what’s going on.

Honestly, I get the appeal of fixing things yourself - nothing like getting your hands dirty and figuring it out right there. But sometimes that approach can backfire, especially with roofs or anything that deals with water. I’ve actually learned (the hard way, too) that a quick DIY patch can mask a bigger issue underneath. Had a small drip in my attic last year, thought I nailed it with some sealant, but turns out the flashing was rusted through in spots I couldn’t see from the outside. Ended up costing me more because I waited.

I know not everyone’s keen on calling in a pro, but sometimes it’s worth at least getting an inspection - especially for stuff you can’t see without tearing things up. It’s easy to miss something minor that turns into a real mess down the road. Guess it depends on how much risk you’re willing to take and how old the place is. For me, I’ll still do small stuff myself but if water’s involved, I’m way more cautious now.

That’s a pretty common scenario, honestly. Water intrusion is tricky - by the time you see a drip, the problem’s often been brewing for a while. Flashing, especially on older roofs, can look fine from the ground but be rusted or pulled away just enough to let water in. I’ve seen folks patch with sealant or tar, but if the underlying metal’s compromised, it’s just a band-aid. Sometimes you need to pull back shingles or panels to really see what’s going on underneath. It’s not always obvious, and missing something small can mean a much bigger repair later. I get wanting to handle things yourself, but with roofs, hidden damage is a real risk.

Can’t argue with that - water finds the tiniest gaps, and it never shows up where you’d expect. Have you ever actually pulled back the metal edging to check for rot or mold underneath? I did that last year and was surprised by how much the decking had softened around the edge, even though everything looked fine from below. Makes you wonder how many folks just slap on some sealant and think it’s fixed. At what point do you just bite the bullet and replace the whole section instead of patching?