I hear you on the caulk and tape—those are just band-aids, especially in places with real winters. I’ve seen so many folks try to get by with a quick patch, only to end up with bigger headaches once the snow melts and water finds its way in. Honestly, if you’re already seeing stains inside, that’s usually a sign the water’s been sneaking in for a while.
When I’m dealing with damaged aluminum flashing, I always check how far the rot or corrosion has spread. Sometimes it’s just a small section, but more often than not, the water’s traveled further than you’d think. I’ll pull back the siding and look for soft spots or mold, then cut out any bad wood before putting in new step flashing and an ice/water barrier. It’s a pain, but skipping steps just means you’ll be back up there next year.
Curious—has anyone tried using copper flashing instead of aluminum? I know it’s pricier, but I’ve heard it holds up better in harsh climates. Wondering if it’s worth the extra cost for folks who keep running into this problem.
Copper’s definitely tempting, but the price tag usually keeps me sticking with aluminum. I’ve managed a few buildings where previous owners went with copper, and yeah, it’s still solid decades later, but if you’re not planning to be in the place long-term, it’s hard to justify. Plus, I’ve seen copper get stolen off roofs more than once—guess it’s a hot commodity. For most rentals, I just make sure the install’s done right and keep an eye out for any early signs of trouble.
I keep going back and forth on this exact thing. My place is only about 12 years old, but I noticed the aluminum flashing around the chimney is starting to look rough—some dents, a little corrosion, and one spot where it’s actually pulled away from the brick. I get why copper’s appealing, but yeah, the price is wild, and I’m not sure I’ll be here long enough to see the payoff.
What I’m stuck on is whether it’s worth patching up the bad spots or just biting the bullet and redoing all the flashing. Has anyone had luck with those aluminum repair tapes or sealants? I’ve seen mixed reviews—some people say it holds up for a few years, others say it’s just a band-aid and you’ll end up with leaks anyway. I’m in a pretty rainy area (Pacific Northwest), so water getting in is my main worry.
Also, does replacing just one section of flashing actually work? Or does that create more seams and potential leak points? Part of me thinks if I’m already up there messing with it, maybe it’s smarter to just redo the whole run... but then again, if most of it looks fine, am I just wasting money?
I’ve read that aluminum can last 20+ years if installed right, but what about when it starts showing these early signs of wear? Is that usually an install issue or just normal aging? And for anyone who’s done a full replacement—how much did it end up costing you (roughly)? Did you DIY or hire someone?
I’m probably overthinking this, but water damage freaks me out way more than spending a little extra now. Just not sure where to draw the line between “quick fix” and “do it right.”
I get where you’re coming from—water intrusion is a nightmare, and the PNW doesn’t mess around with rain. But I’m not totally convinced a full redo is always the answer, especially if you’re not sure how long you’ll stay. I’ve seen a lot of folks jump to full replacement when sometimes a targeted repair actually does the trick, at least for several years.
On my uncle’s house (also here in the Northwest), he had a similar situation—aluminum flashing with a couple spots pulling away and some corrosion, but the rest looked decent. He used one of those butyl-backed aluminum tapes on a pulled seam and sealed a few pinholes with a high-quality roof sealant. It’s been almost four years now, and it’s still holding up. Granted, he checks it every spring, but it’s saved him a chunk of change so far. I think the key is making sure you prep the area well and don’t just slap tape over dirt or corrosion.
Replacing just one section can work, but yeah, you’re right—it introduces extra seams. If you’re careful and overlap everything correctly, it shouldn’t be a huge issue, but it’s definitely more points where water could sneak in if something shifts. I’ve seen patch jobs last, but I’ve also seen them fail if someone cuts corners.
About the lifespan—aluminum should make it 20+ years, but I think install quality and exposure make a big difference. If it’s pulling away already, maybe whoever did it didn’t anchor it well or used cheap caulk. Or maybe it just took a beating from wind or debris.
Full replacement isn’t cheap. My neighbor paid around $1,200 for pro work on his chimney flashing (not even copper), but that included some brick repointing too. DIY would be less, but it’s not super beginner-friendly if you haven’t done flashing before.
If most of yours looks solid and you’re not planning to stay forever, I’d lean toward a solid repair and just keep an eye on it. Worst case, if you see more issues in a year or two, you can always go bigger then. Just my two cents—sometimes “good enough” really is good enough, especially if you’re diligent about checking things after storms.
I’ve seen a lot of folks go the patch route and honestly, if you’re on top of maintenance, it can work out just fine. I inspected a place last year where the owner had used that butyl tape on some old flashing—looked rough but was bone dry underneath. The trick is definitely in the prep and not rushing it. That said, I’ve also seen quick fixes fail when people just smeared sealant over rust and called it good... then wondered why water got in later. If you’re not planning to stick around long-term, I’d probably do the same—just keep an eye out after big storms.
