Quick fix or redo: dealing with damaged aluminum flashing

I hear you on the recycled aluminum - some of it really does feel like it’s made out of old soda cans. I’ve had a few repairs where I could literally bend the stuff with my fingers, which isn’t exactly reassuring when you’re trying to keep water out. The heavier gauge is definitely worth the extra bucks, especially in places that get hammered by freeze-thaw cycles. I’ve seen the thin stuff buckle and split after just one rough winter.

Copper’s gorgeous, but yeah, unless you’re working on a historic building or someone’s dream home, it’s usually out of budget. For most of my properties, I stick with .027 or .032 aluminum and just avoid the bargain-bin brands. It’s not bulletproof, but it holds up way better than the super thin stuff.

Quick fixes are tempting when you’re in a pinch, but if the flashing’s already crumpling, I’d lean toward replacing that section with something sturdier. Otherwise, you’ll probably be back up there next season doing it all over again... and nobody wants to spend their weekends on a ladder if they don’t have to.

Quick fixes are tempting when you’re in a pinch, but if the flashing’s already crumpling, I’d lean toward replacing that section with something sturdier.

That’s been my experience too - patching flimsy flashing just leads to callbacks. Have you ever tried stainless steel for smaller problem spots? It’s pricier than aluminum but not as wild as copper, and it actually holds its shape. Wondering if anyone’s seen it hold up long-term in tough climates.

Stainless steel’s actually what I used around my chimney after the third time patching aluminum. I’m in the Midwest, so we get freeze/thaw and some wild wind. Three years in, it still looks solid - no warping or leaks. It was a pain to cut, though. Have you noticed any corrosion or is it just me being paranoid?

Three years in, it still looks solid - no warping or leaks. It was a pain to cut, though. Have you noticed any corrosion or is it just me being paranoid?

Stainless holds up way better than aluminum, especially with Midwest weather swings. If you used 304 or 316 grade, you’re probably fine - corrosion’s rare unless there’s salt exposure or dissimilar metals touching. I’d just check seams for any rust stains a couple times a year, especially after winter. If you’re not seeing orange streaks or pitting, you’re good. Cutting it is brutal though... I’ve snapped more than one blade on that stuff.

I get where you’re coming from about stainless being more durable, but honestly, I’ve had aluminum flashing last just as long - sometimes longer - if it’s installed right and you keep up with the caulking. Midwest winters are rough, but unless you’ve got a lot of road salt or your gutters are steel (so you get that galvanic reaction), I wouldn’t write off aluminum so fast.

My last place had aluminum flashing for almost a decade before I noticed any issues, and even then it was mostly where water pooled because of ice dams. Stainless is a beast to cut, no argument there... but for most houses, aluminum’s easier to work with and way cheaper if you have to redo a section.

If you’re not seeing white powdery spots or actual holes, I’d say paranoia might be winning out over reality here. Just keep an eye on it after the thaw each spring. Sometimes “quick fix” really does hold up longer than we expect.

Funny timing - just noticed a couple spots where my aluminum flashing looked rough after the last freeze. I’ve always wondered if I’m overthinking it, since the stuff’s been up for at least 7 years with barely any TLC. Have you ever tried patching with that butyl tape instead of caulk? I’m tempted, since cutting in new flashing is such a pain, but I don’t want to just kick the can down the road... Any luck with patches holding up through wet springs?

- Seven years is a solid run for aluminum flashing, especially with little maintenance.
- Butyl tape can be a decent patch-up - I've used it on a few gutter seams and around a vent, and it survived two soggy springs in the Midwest.
- If the damage isn't too deep or widespread, it's worth a shot. Just make sure the area’s clean and dry before sticking it down.
- Not as pretty as new flashing, but way easier than wrestling with metal up there...
- Worst case, you get another season or two out of it while you plan a bigger fix. Sometimes that’s all you really need.

- Agreed, seven years without much upkeep is honestly better than I expected for aluminum.
- Butyl tape worked for me on a downspout joint - held up through a couple freeze-thaw cycles, which surprised me.
- Prep matters. If there’s any old caulk or grime, it won’t stick and you’re back to square one after the first rain.
- Not the prettiest, but if you’re watching costs, it’s a decent stopgap.
- I’d keep an eye on it after storms... sometimes the tape peels if water gets underneath.
- For bigger holes or if water’s already gotten in, I’d probably just budget for a full section replacement next dry spell.

Seven years out of aluminum flashing without major issues is actually pretty solid, especially if you’re in an area with a lot of freeze-thaw cycles. I’ve seen plenty of installations start to show their age much sooner, especially if the original install skipped on prep or used the wrong sealant. Butyl tape can be a real lifesaver for small leaks or joints - definitely not the prettiest, but it’s surprisingly resilient if you get the surface clean and dry first. I’ve come across repairs where folks just slapped it over old caulk or dirt, and sure enough, it peeled right off after a couple storms.

One thing I’d add: even with good prep, butyl tape is really just a temporary fix. It’ll buy you some time, but once water gets underneath or the tape starts to lose its grip, you’re back to square one. I usually tell people to check those spots after heavy rain or wind, just in case. If you’re seeing bigger holes or any sign that water’s already gotten behind the flashing, replacement is usually the safer bet. Water trapped behind aluminum can lead to rot in the sheathing or framing underneath - seen that more than once on inspections.

If budget’s tight, patching makes sense for now, but I’d keep an eye out for any signs of moisture inside (like staining or musty smells). Sometimes what looks like a small exterior issue turns into a bigger headache down the line if water finds its way in. For what it’s worth, I’ve had clients stretch these kinds of repairs for a season or two before biting the bullet on a full section replacement. Just depends how much risk you’re comfortable with.

All in all, sounds like you’re taking a pretty practical approach - just don’t let those “temporary” fixes become permanent ones by accident.

- Seven years is decent, but I’ve seen flashing fail in three when installers cut corners.
- Butyl tape’s a band-aid - fine for a season, but it always lets go eventually, especially with sun exposure.
- If you’re patching, I’d check for hidden mold or rot every few months. Once water sneaks in, it’s a pain to stop.
- Personally, I’d lean toward a proper redo if you see any swelling or soft spots in the sheathing. Temporary fixes have a way of becoming permanent... and then you’re stuck.
- Not a fan of aluminum for long-term in wet climates - copper or steel lasts way longer, but yeah, costs more upfront.

I get the argument for copper or steel, but man, the price difference is no joke. I had to patch a section last year and just couldn’t justify the cost at the time. Has anyone actually seen aluminum totally fail from rot, or is it usually the wood underneath that goes first?

- Haven’t seen aluminum itself rot - usually it’s the wood under it that gets trashed first, especially if water sneaks in somewhere.
- Aluminum can corrode, but it takes a while unless you’re near the coast or have some weird chemical reaction going on.
- Patched mine last fall after a squirrel “remodel.” The flashing was still fine, but the plywood underneath? Not so much.
- Honestly, for the price, aluminum’s not bad unless you’re planning to never touch your roof again. Copper looks cool but my wallet says nope.

Had a similar situation last year - thought the flashing was the problem, but it turned out to be the OSB underneath that was basically mulch.

“The flashing was still fine, but the plywood underneath? Not so much.”

- Seen a lot of this in humid climates - once the OSB goes, it’s tough to stop the rot.
-

“Aluminum held up better than I expected, honestly.”

Tried a couple of those “miracle” sealants from the hardware store - one was basically glorified paint, the other actually seemed to help for a season or two. Still, once the OSB got mushy, it was game over. I’m in the Gulf Coast, so humidity’s a beast. Anyone ever just replaced the flashing and slapped peel-and-stick under it? Wondering if that’s just wishful thinking or actually buys some time.

Peel-and-stick under new flashing can buy you a little time, but in Gulf Coast humidity, it’s really just a band-aid. Once the OSB’s gone soft, moisture finds its way back in no matter what. I’ve tried patching, but ended up redoing the whole section anyway.

Once the OSB’s gone soft, moisture finds its way back in no matter what. I’ve tried patching, but ended up redoing the whole section anyway.

Yeah, I’ve been down that road. Tried a quick patch with peel-and-stick after a storm last year - bought me maybe a month before the damp spots crept back in. The humidity here just eats away at anything less than a full fix. Ended up pulling off the siding and replacing the OSB too. It’s a pain, but honestly, I sleep better now when it rains. Sometimes those “band-aids” just don’t cut it in this climate...

That’s been my experience too - once the OSB gets compromised, it’s just a matter of time before moisture finds its way back in. I’ve tried patching with various products, but nothing really held up long-term. Full replacement is a hassle, but it’s the only thing that’s given me peace of mind during heavy rains. It’s frustrating, but you’re definitely not alone dealing with this stuff...

I’ve run into the same headache with aluminum flashing, especially on older buildings where patch jobs just don’t seem to last. Have you ever tried using peel-and-stick flashing tape as a temporary fix? I’ve had mixed results - sometimes it buys a season or two, but if the OSB underneath is already soft, it’s kind of a lost cause. Curious if anyone’s found a patch that actually holds up through a wet winter... or is full replacement just always the way to go?

Had a similar situation last fall on a 1950s bungalow - aluminum flashing around the chimney was looking rough, and water started sneaking in after a couple heavy rains. I tried the peel-and-stick stuff as a stopgap, since winter was coming and I didn’t have time (or budget) for a full replacement. It stuck okay at first, but honestly, by March it was curling up at the corners and water had found its way underneath. The OSB was already a bit punky in spots, which probably didn’t help.

What surprised me was how fast things went downhill once moisture got in. I figured I’d bought myself a year, but it was more like four months before I was back up there with a tarp and a lot of regret. Ended up doing a proper tear-out in the spring - new OSB, ice & water shield, and step flashing. Not cheap, but I haven’t had a drip since.

I get why people want to patch, especially when money or weather’s tight. Sometimes you just need to buy time. But if the wood underneath is soft, those quick fixes just don’t seem to hold up. Maybe if you catch it early and everything’s still solid, tape or some high-quality sealant can stretch things out for a season. Once rot sets in though, it’s like playing whack-a-mole with leaks.

Funny thing is, my neighbor swears by this heavy-duty butyl tape he gets from a marine supply shop - says it’s lasted two winters for him. I’m skeptical, but maybe it’s better than the big box stuff? Either way, I’m convinced now that if you see any softness in the sheathing, it’s time to bite the bullet and do it right. Otherwise you’re just inviting more headaches down the road.