Quick fix or redo: dealing with damaged aluminum flashing

I hear you on the liquid flashing - tried it on a dormer corner last fall, and it looked solid at first, but after a couple freeze-thaw cycles, I noticed some hairline cracks too. It’s tempting to go for the quick fix, especially when you’re up against weather or time, but I’ve found that cutting out the bad section and sliding in new flashing just holds up better in the long run. Curious if anyone’s had luck with those peel-and-stick flashing membranes? I’ve seen mixed results, but maybe it depends on the roof pitch or how much sun exposure you get.

- Seen a lot of those peel-and-stick membranes on jobs lately. Mixed bag, honestly.
- They’re quick, but I’ve noticed a few things:
- Adhesion can be spotty if the surface isn’t bone dry and clean. Even a little dust or moisture and you’re asking for trouble.
- Sun exposure matters. South-facing slopes, especially with dark shingles, tend to cook those membranes over time. I’ve seen them start to curl or lose grip after a couple summers.
- On low-pitch roofs, water can back up and sneak under the edge if it’s not sealed perfectly. Steeper pitches seem to fare better.
- Had one client use it on a shallow porch roof - looked fine for about two years, then started peeling at the edges. Not catastrophic, but not great either.
- If you’re in a spot with big temperature swings (freeze-thaw cycles), I’d be wary of relying on peel-and-stick as the main defense. It just doesn’t flex as well as metal flashing over time.
- For quick patches or as an extra layer under step flashing, it’s not bad. But I wouldn’t trust it alone on corners or valleys where water really wants to get in.
- Cutting out and replacing the damaged aluminum is more work up front, but you’re less likely to be back up there in a year redoing it.
- If you do go peel-and-stick, make sure you roll it down hard and lap it right - overlap is key.

Guess it comes down to how long you want the fix to last and how much hassle you’re willing to deal with later. Personally, I’d rather do it once and not worry about callbacks... but sometimes weather just doesn’t give you that luxury.

- Had a tenant call me about a “mystery drip” last winter - turned out the old flashing was basically just decorative at that point.
- Tried the peel-and-stick for a quick patch (because, of course, it started raining halfway through). Looked fine for a bit, but by spring it was peeling up like a bad sticker tattoo.
- Ended up pulling it all and just replacing the aluminum. More hassle, but at least I’m not getting those 2am “it’s leaking again” texts.
- I get the appeal of quick fixes, but for me, if I don’t want to see that roof again for a while, I just bite the bullet and do it right.
- Bonus: tenants think I’m a wizard when the leaks actually stop... until the next thing breaks.

Peel-and-stick patches always seem like a good idea in the moment, especially when you’re racing the weather, but I’ve never had one last through a full winter. Once moisture gets under there, it’s game over. Full replacement is usually the only way to get real peace of mind. If you ever want to avoid that hassle long-term, I’d look into more sustainable flashing materials - copper or even recycled aluminum with a proper sealant. Costs more up front, but way less maintenance down the line.

I hear you on the peel-and-stick patches - they’re tempting when you’re in a pinch, but I’ve watched them peel up after just a couple freeze-thaw cycles. One winter, I thought I’d outsmart the leaks with a patch job, but by February, water was sneaking in again. Swapping out the whole section with better flashing and a solid bead of sealant took more time, but honestly, it’s been headache-free since. Upfront cost stings a bit, but not having to babysit it every season is worth it for me.

Swapping out the whole section with better flashing and a solid bead of sealant took more time, but honestly, it’s been headache-free since. Upfront cost stings a bit, but not having to babysit it every season is worth it for me.

I totally get where you’re coming from. I tried the quick patch route last year on my uncle’s garage - looked fine at first, but after a couple storms, water found its way back in. Ended up redoing the whole flashing anyway. It’s a pain upfront, but not having to climb up there every few months is a relief. Sometimes those shortcuts just don’t hold up, especially with our wild winters.

I’ve seen the same thing at a couple of my buildings - patch jobs just don’t cut it long-term, especially with all the freeze/thaw cycles we get. I’m curious, for those who’ve done the full replacement, did you go with aluminum again or try something else? I’ve heard mixed things about switching to steel or even PVC flashing, but haven’t tried them myself. Wondering if it’s worth the extra upfront cost or if aluminum’s still the way to go for most folks.

I’ve heard mixed things about switching to steel or even PVC flashing, but haven’t tried them myself. Wondering if it’s worth the extra upfront cost or if aluminum’s still the way to go for most folks.

I went through this last year after a nasty winter did a number on my old aluminum flashing. I looked into steel since everyone kept saying it holds up better, but honestly, the price difference was pretty noticeable - especially once you factor in labor. Ended up sticking with aluminum again, mostly because it was what I could afford at the time and my roofer said as long as it’s installed right and checked every few years, it should last a good while.

PVC sounded interesting, but I worried about how it’d handle our temperature swings. Maybe it’s fine in milder spots, but here in the Midwest, I just didn’t want to risk it cracking or warping. If money wasn’t so tight, I might’ve gone with steel for peace of mind, but for now, aluminum’s been holding up okay. Just gotta keep an eye on it after those freeze/thaw cycles...

Aluminum’s kind of the “Honda Civic” of flashing - does the job, doesn’t break the bank, but you’ll notice some dings after a rough winter. I’ve seen PVC get brittle here too. Steel’s tough, but yeah, your wallet will feel it. Just keep an eye out for corrosion and loose nails after those wild freeze-thaw cycles... that’s usually where trouble starts.

Aluminum’s kind of the “Honda Civic” of flashing - does the job, doesn’t break the bank, but you’ll notice some dings after a rough winter.

That’s spot on. My garage roof’s got aluminum flashing that looks like it went three rounds with a hailstorm. I just tap the loose bits back down and slap on some sealant. Not pretty, but it keeps the water out... for now. Steel’s tempting, but my wallet says nope.

I just tap the loose bits back down and slap on some sealant. Not pretty, but it keeps the water out...

I get the “just tap the loose bits back down” approach, but I’m starting to wonder if patching is just putting off a bigger headache. My flashing’s got a bunch of tiny bends and cracks after last winter. Anyone tried those peel-and-stick flashing tapes as a middle ground? Not sure if it’s just a band-aid or actually worth it.

I’ve actually wondered the same thing about those tapes. My uncle swears by them for “quick and dirty” fixes, but I’ve seen spots where the tape started peeling after a couple of hot summers. Maybe it’s better than nothing if you’re in a pinch, but I’m not sure I’d trust it long-term, especially with all those little cracks you mentioned.

Last fall, I tried using some on a shed roof that had a bunch of dings from hail. It worked alright through the winter, but now some edges are curling up. I guess it depends on how exposed your flashing is and how much weather it gets. Are your cracks just surface-level or do they go all the way through? I keep hearing that once aluminum starts cracking, it can spread pretty fast if water gets in... Anyone else deal with that?

now some edges are curling up

That’s the classic “tape escape” move - seen it plenty. I once patched a gutter seam with that miracle tape after a hailstorm, felt like MacGyver for a week. By July, it looked like a sunburned snake peeling off. If those cracks are more than just surface scratches, water’s gonna find its way in, and then you’re basically hosting a rust party. I’d say tape’s fine for a quick patch, but if you want to sleep through the next thunderstorm, probably worth redoing the flashing.

By July, it looked like a sunburned snake peeling off.

That’s exactly what happened to my “emergency fix” last summer. I slapped some heavy-duty tape on a flashing joint after a windstorm, felt pretty clever at first. Fast forward a couple months and the tape was curling up like old wallpaper, just begging for rain to sneak in. I kept telling myself it’d hold until fall, but then we got one of those sideways rainstorms and - yep - water started dripping into the laundry room.

Honestly, I get the temptation to keep patching, but I’m starting to think it’s like putting a Band-Aid on a leaky dam. The quick fix buys you time, but not much peace of mind. If you’re in a spot where you can get up there safely, redoing the flashing is probably the way to go. I learned the hard way that “good enough for now” usually means “fix it twice.”

The quick fix buys you time, but not much peace of mind.

Couldn’t agree more. I see this all the time - tape or caulk slapped on flashing, only to peel up or crack after a season or two. It’s tempting, especially if you’re dealing with a steep roof or lousy weather, but water always finds a way in. If you’re comfortable working up there, pulling the old flashing and doing it right is usually worth the hassle. Otherwise, that “emergency fix” just turns into a bigger headache down the road.

That’s the truth - water’s relentless. I remember after a hailstorm, I tried patching a dented section with some heavy-duty tape, thinking it’d hold till spring. By the next big rain, water had wormed its way underneath and dripped right into the attic insulation. The hassle of pulling soggy insulation was way worse than just replacing the flashing in the first place. Sometimes those quick fixes just buy you a mess you didn’t plan for... but I get why folks do it, especially when the weather’s nasty or the roof’s steep.

Sometimes those quick fixes just buy you a mess you didn’t plan for... but I get why folks do it, especially when the weather’s nasty or the roof’s steep.

Man, I’ve seen more “temporary” tape jobs turn into full-blown disasters than I can count. Had a guy last winter who used duct tape on his valley flashing - said he figured it’d hold till spring. By February, he had icicles hanging from his living room ceiling and a mushroom farm in the attic. Not exactly what you want growing up there.

I get it though - nobody wants to be up on a 10/12 pitch in freezing rain, wrestling with slippery metal. But water’s like that one relative who always finds a way in, no matter how many locks you put on the door. If there’s even a pinhole, it’ll find it.

Honestly, sometimes ripping off the bandaid and just replacing the flashing saves you way more time (and money) than patching ever will. Learned that the hard way myself after chasing leaks around my own place for weeks. Quick fixes are tempting, but water doesn’t care about your schedule...

water’s like that one relative who always finds a way in, no matter how many locks you put on the door

That line cracked me up - so true. I’ve tried every “quick fix” in the book and water still manages to RSVP anyway. Sometimes you just gotta bite the bullet and do it right, even if it means braving the elements. At least you’re not alone in learning the hard way... I’ve had my share of attic mushrooms too.

Had a flashing “patch job” last winter - thought I was clever with some caulk and aluminum tape. Two weeks later, water found a new route and I ended up with soggy insulation. Guess there’s no shortcut when it comes to flashing, especially on low-slope roofs.

Not sure I totally agree that there’s “no shortcut” with flashing, at least for every situation.

“Guess there’s no shortcut when it comes to flashing, especially on low-slope roofs.”