Quick fix or redo: dealing with damaged aluminum flashing

That condensation under the layers is exactly what I see a lot during spring inspections - especially where folks have tried to layer materials or use whatever’s on hand. I get the appeal of “green” sealants, but I’ve noticed most of them just don’t cure right in cold temps. Did you try warming up the tube before applying, or was it straight out of the garage? Sometimes that helps, but honestly, I’m not convinced any of those eco-friendly products are up to the job when it’s below freezing.

I’m curious, did you notice if the recycled aluminum was pitted or oxidized at all? I’ve seen that make a big difference in how well sealants stick, especially if there’s any residue left from its previous life. Also, when you pulled it off in spring, was there any sign of the sealant actually failing, or was it more about the moisture sneaking in from the edges? I keep running into folks who swear by “just one more layer,” but it always seems to come back to haunt them later.

Quick fix or redo: dealing with damaged aluminum flashing

I totally get the temptation to just slap on another layer and call it good, but man, I learned the hard way last winter. Tried using one of those “green” sealants on some old flashing - straight out of the cold garage, which probably didn’t help. It looked fine at first, but by spring, the edges were all lifting and there was this nasty white gunk where moisture had crept in. The recycled aluminum was definitely a bit pitted, too. I’m starting to think that unless you really clean and prep it, nothing’s gonna stick for long, especially if you’re working in the cold.

I’m starting to think that unless you really clean and prep it, nothing’s gonna stick for long, especially if you’re working in the cold.

I’ve tried the “just patch it” route a few times and honestly, it never lasts. Prepping takes longer but saves money in the long run. I learned to at least wire brush and use rubbing alcohol before any sealant - otherwise, it’s just throwing cash away when it peels up. Cold weather makes everything harder, too... I’ve had caulk freeze before I even finished.

I’ve had the same issue with caulk not setting right in the cold - sometimes it just skins over and never really bonds. What’s worked for me is using a heat gun to warm up the metal and the sealant area before applying anything. It’s a bit of a hassle, but I’ve noticed way better adhesion. Have you ever tried using butyl tape instead of caulk for patches? I find it holds up better, especially when temps drop.

Have you ever tried using butyl tape instead of caulk for patches? I find it holds up better, especially when temps drop.

I totally get what you mean about caulk in the cold - mine basically turned into a gummy mess last winter. Butyl tape was a game changer for me too, especially on those awkward seams. It’s not as tidy looking, but honestly, I’ll take function over form if it means no leaks. The only thing is, I had to really clean the surface or it wouldn’t stick well. Worth the extra prep in my book.