I’ll take ugly flashing over water damage any day. It’s just not worth the gamble, especially up here where freeze-thaw cycles are brutal.
I get where you’re coming from, but is it always that black and white? I mean, I’ve seen some newer gasket designs that claim to handle expansion and contraction a lot better than the old-school stuff. My attic fan came with a pretty beefy rubber gasket, and the instructions were adamant about not adding extra sealant—supposedly it messes with how the gasket compresses. Has anyone actually had luck with just following the manufacturer’s install, no extra flashing or goop?
I’m in central PA, so we get our share of freeze-thaw too. I did a test run last winter—checked the attic after every big melt, and so far, bone dry. Maybe I just got lucky, or maybe the tech’s improved? Not saying I’d skip flashing on a low-slope roof, but for a steep pitch with good shingles, is overkill always necessary? Just curious if anyone else has had a different experience with these newer gaskets.
I’ve had almost the exact same debate with myself when I put in my attic fan last year. My roof’s a 12/12 pitch, asphalt shingles, and I’m in upstate NY, so the freeze-thaw thing is definitely real. The fan came with one of those chunky rubber gaskets too, and the manual was super clear—no caulk, no extra flashing, just trust the gasket. I’ll admit, it felt weird not adding a bead of sealant “just in case,” but I figured I’d try it their way first.
After two winters and a couple of ice storms, I haven’t seen a single drip in the attic. I keep checking after big snow melts or heavy rain, and so far so good. Like you said, maybe it’s luck, or maybe these new gaskets really are up to the job. One thing I noticed: the gasket still looks flexible and hasn’t cracked or shrunk at all, which is more than I can say for the old-style roof boots on my plumbing vents—they’re already getting brittle after five years.
I do get why people default to “more is better” with flashing and sealant, especially if they’ve dealt with leaks before. But sometimes piling on extra stuff can backfire. My neighbor slathered his vent with roofing tar and it actually trapped water under the shingles, which made things worse when it froze.
I wouldn’t skip flashing on a flat or low-slope roof either, but for steep pitches with modern materials, following the instructions seems to be working out. I guess the key is making sure everything’s installed dead-on—no shortcuts or “good enough” moments. If you botch the cut or pinch the gasket, all bets are off.
Anyway, just my two cents from a couple seasons in. Maybe we’re seeing some actual progress with these newer designs... or maybe we’ll both eat our words in ten years when something finally fails. Time will tell.
- Totally get the urge to overdo it with sealant, but your experience is reassuring.
- I was nervous trusting just the gasket on my install too—felt almost too simple.
- Haven’t seen leaks yet either, and we had some brutal wind-driven rain this spring.
- Agree about install quality—if you get lazy with the cut or torque, nothing will save it.
- Honestly, seeing the gasket still flexible after a year gives me more confidence than any caulk job I’ve done.
- Guess these new materials are actually earning their keep... at least for now.
I had the same hesitation about just relying on the gasket—felt like I was skipping a step or something. I’m used to slathering on sealant for anything roof-related, but the instructions were pretty clear about not overdoing it. Ended up following them (mostly), and after a year of some wild Midwest storms, still bone dry in the attic. I do check it every few months, just in case.
One thing I noticed: the cut around the opening really does matter. I got a little sloppy on one side and had to go back with some flashing tape to make myself feel better. Not sure if it was necessary, but peace of mind counts for something.
I’m still a little skeptical about how long these gaskets will last compared to old-school caulk, but so far, so good. At least they don’t turn into that cracked mess after a couple summers. Maybe there’s something to these “new materials” after all...
- I get the skepticism—old habits die hard. I used to go heavy on caulk too, but after seeing how it cracks and peels after a couple summers, I’m starting to trust these gaskets more.
- Did a similar install last fall. I was super careful with the cut, but still ended up using a bit of flashing tape just for my own sanity. Not sure it was needed, but it’s cheap insurance.
- One thing I noticed: the gasket material seems to flex better with temp swings than caulk ever did. Midwest winters here, so that’s saying something.
- I’m keeping an eye on it, but so far, no leaks and no maintenance costs. If it holds up for a few years, I’ll call it a win.