Mixing metals is a classic headache—galvanic corrosion sneaks up on a lot of folks. That white fuzz is a dead giveaway, and honestly, it’s not just cosmetic. I’ve seen it eat through flashing faster than you’d think, especially if there’s any standing water. Skipping the ice shield is a gamble, but you’re definitely not alone there. The cost stings, but patch jobs rarely hold up long-term in my experience. Still, I get the hesitation—roof work isn’t exactly a walk in the park, especially if you’re worried about soft decking. Sometimes biting the bullet and doing a proper fix saves a lot of stress (and money) down the line.
- Galvanic corrosion's a pain, no doubt—seen plenty of aluminum flashing go chalky and brittle, especially near copper or steel.
- Quick patches might buy time, but yeah, water finds every weak spot.
- Ice shield's pricey but can be a lifesaver in freeze/thaw climates.
- I get wanting to avoid a full redo, especially if the decking feels soft already... that's a whole other can of worms.
- Sometimes people just need to hear that it's not just them—roofs are tricky, and even pros run into surprises mid-project.
- If it helps, I've seen folks regret skipping the proper fix more than the extra upfront cost. Still, totally get why it feels like a tough call.
Is it weird that I’m more scared of what’s under the old flashing than the actual leak? Every time I think about pulling it up, I start imagining rotten wood and a whole summer project. Has anyone tried just overlapping new aluminum over the old stuff, or is that just asking for trouble down the line? I get the “do it right” argument, but man, sometimes you just want to stop the drip and move on…
I get where you’re coming from—sometimes the thought of what’s hiding under old flashing is scarier than the leak itself. I’ve been there, standing on a ladder, prying up a corner and just hoping I don’t find a mushy mess underneath. The temptation to just slap some new aluminum over the top is real, especially if you’re staring down a busy summer and don’t want to open up a can of worms.
Here’s the thing: overlapping new flashing on top of old can work as a temporary fix, but it’s kind of like putting a band-aid over a splinter. It’ll stop the drip for now, but if there’s rot or mold under there, it’s only going to get worse. I’ve seen folks do this and buy themselves another year or two, but then they end up with bigger headaches—like sagging sheathing or even framing issues. Not fun.
That said, not every leak means disaster underneath. Sometimes it really is just failed caulk or a bent piece letting water in. If you’re in an area with mild weather and your roof isn’t ancient, you might get away with patching for a while. But if you’re seeing signs like soft spots when you walk on the roof, or discoloration inside, that’s usually trouble brewing.
One trick I’ve used: carefully lift just enough flashing to peek at the wood below without tearing everything apart. If it looks solid and dry, maybe you can justify overlapping for now—but keep an eye on it. If it’s spongy or darkened, biting the bullet and replacing that section is probably smarter in the long run.
I know nobody wants their “quick fix” turning into a summer-long project (been there more times than I care to admit), but sometimes facing what’s under there early saves you from way bigger repairs later. Just depends how much risk you’re willing to take—and how much time you want to spend up on that roof next year...
Had a client last fall who kept layering new flashing over old, hoping to dodge a bigger repair bill. By the time I got up there, the wood underneath was basically mulch. Looked fine from the outside, but the rot was spreading fast. Sometimes you just gotta rip off the band-aid, even if it stings your wallet.