Solar attic fan install was supposed to be easy... right?

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.

I’m with you on the caulk - used to swear by it, but after a couple freeze-thaw cycles, it just doesn’t hold up. I tried one of those “no-caulk” gaskets last year on my shed roof (asphalt shingles, northeast), and honestly, I was surprised. Still looks tight, even after a brutal winter. I did throw some flashing tape under the flange too, just in case. Maybe overkill, but I’d rather not be up there fixing leaks in February. Guess time will tell if it’s really maintenance-free, but so far, no regrets.

I hear you on the overkill - honestly, I’d rather slap on too much flashing than not enough. Those “no-caulk” gaskets seemed a bit gimmicky to me at first, but now I’m kinda curious. Did you notice any weird noise from the fan after install? Mine started rattling a bit after a cold snap and I’m not sure if it’s the gasket or just my luck...

That rattle after a cold snap sounds all too familiar. I had something similar happen last winter with a solar fan I put in myself. At first, I blamed the gasket too - figured it was getting stiff or shrinking in the cold and letting the housing vibrate. Turned out, it was actually the fan blades shifting just a hair on the spindle because of the temperature change. The gasket was fine, but the cold made the plastic a bit more brittle and noisy.

I get your skepticism about those no-caulk gaskets. I thought they were just another way to charge a few extra bucks, but after wrestling with sticky goop and messy caulk for years, I finally tried one on a whim. Not perfect, but it did save me some cleanup and it hasn’t leaked yet (knock on wood). Still, I wouldn’t trust it alone if you’re in a spot with crazy wind or big temp swings. I doubled up with some flashing just in case - probably overkill, but I’d rather be safe than patching leaks in January.

If you’re hearing rattling only after a freeze, maybe check if any mounting screws backed out a little? Sometimes the expansion and contraction can work them loose, especially if the roof decking isn’t super thick. I’ve had to snug mine up every spring. Also, if your attic gets really dry in winter, wood shrinkage might be part of it too.

Honestly, these “easy” installs always come with some little surprise. But if you’ve got decent flashing and the gasket’s not cracked or pinched, you’re probably fine. Just keep an ear out - if it gets worse, maybe pop up there and give things a wiggle.

I still think a bit of overkill is better than waking up to water stains on the ceiling...

Honestly, these “easy” installs always come with some little surprise.

That’s the truth. Every “simple” project seems to have a hidden gotcha. You’re doing all the right things by checking for loose screws and keeping an eye on the gasket. I’ve seen even pro installs need a tweak after a cold snap - materials just move more than you’d think. If it’s just a rattle and not a leak, you’re ahead of the game.

Funny how “should be done in an hour” turns into half a Saturday, right? I see this all the time - attic fans especially. Last year, I checked one where the installer missed a single shingle overlap and it dripped after every heavy rain. Did you notice any odd gaps under the flashing, or is it just vibration? Sometimes the fan housing shifts a hair after a big temp swing and that’s all it takes. Curious if you’re dealing with composite shingles or metal - makes a difference for movement.

I get what you’re saying about the shingle overlap, but honestly, I’ve seen more issues crop up from the actual fasteners than from the flashing itself - especially with solar attic fans. Last summer, I helped a neighbor install one on his composite shingle roof. We were super careful with the flashing, but a couple of those self-tapping screws ended up just a hair off and that’s where water found its way in after a big storm. The weird part? The flashing looked perfect from above, but underneath, there was just enough of a gap for capillary action to do its thing.

I’m not totally convinced it’s always about movement from temp swings either. Composite shingles can flex a bit, sure, but if you use the right sealant and don’t overdrive the fasteners, things usually stay put. Metal roofs are another story - those expand and contract like crazy and can pull things loose over time. But with composite, I’d double-check every screw and maybe even go for a butyl tape under the flashing next time. It’s not foolproof, but it’s saved me some headaches.

That’s wild, I’ve seen something similar happen with a ridge vent install - flashing looked textbook, but a couple screws weren’t snug enough and water tracked right down the threads. I started using a dab of high-grade sealant under each fastener and it’s made a difference. Butyl tape under flashing is a solid call too, especially on older shingles where things don’t always sit flush. It’s funny how the little details end up being the big headaches...

It’s funny how the little details end up being the big headaches...

That’s the truth. I thought I was being super careful with my attic fan install, but I still ended up chasing a tiny drip for weeks. My shingles are about 18 years old and definitely not as flat as they used to be, so getting everything to sit right was a pain. Did you notice any issues with the sealant holding up over time, especially through freeze/thaw cycles? I’m in the Midwest and that seems to be where things start to fail for me.

My shingles are about 18 years old and definitely not as flat as they used to be, so getting everything to sit right was a pain.

Man, I hear you on that. Once those shingles start curling up, it’s like trying to get a sticker to stick to a basketball. Midwest freeze/thaw is brutal - sealant always seems fine until that first spring melt. I’ve had better luck with butyl tape under the flashing, then a bead of high-quality polyurethane sealant on top. Still, nothing’s perfect if the shingles are waving at you in the wind...

Getting a solar attic fan on 18-year-old shingles is always a bit of a wrestling match. Once those tabs start curling, nothing wants to lay as flat as the instructions suggest. I’ve run into that plenty - sometimes you peel up a shingle and it just cracks or crumbles in your hand. Midwest winters don’t do us any favors either.

Butyl tape under the flashing is a good move, and that polyurethane bead helps, but honestly, if the shingles are waving at you, there’s only so much sealant can do. I’ve had jobs where I ended up sliding an extra piece of aluminum step flashing under the problem area, just for peace of mind. Not always pretty, but it keeps the water out.

If you’re not seeing leaks after the first couple of storms, you probably did better than most. Just keep an eye on it when the snow melts - those old shingles can surprise you with new gaps once everything thaws out. Sometimes it’s more about managing what you’ve got than making it perfect.

Man, curling shingles are the worst. I tried installing a vent last fall on my uncle’s place - shingles were about 17 years old and honestly felt like stale potato chips. Every time I thought I had one lifted just enough, it’d split or just refuse to settle back down. Ended up using a lot more flashing than I planned, and yeah, it looked a little Frankenstein-ish, but at least it survived the spring thaw without leaks. Midwest roofs are like a box of surprises once the snow melts... never quite know what you’re gonna get.

That “stale potato chip” feeling is way too familiar. I had a place a couple years back - roof was pushing 20 years, and just walking up there felt like stepping on a tray of crackers. Tried to patch in a satellite dish and every shingle I touched either cracked or just wouldn’t flex back down. Ended up with a patchwork of caulk and flashing that honestly looked like a raccoon had a go at it.

I always wonder if there’s a magic age where shingles just give up the ghost for good. Around here (central Illinois), anything over 15 years seems to be a gamble, especially after a couple rough winters. I’ve started telling folks if they’re thinking about adding vents or solar fans, might as well budget for a few bundles of replacement shingles, just in case. Sometimes you get lucky and they’ll lay flat again, but more often than not, it’s like trying to glue potato chips together.

Curious if anyone’s had better luck with those newer synthetic shingles? I keep hearing they last longer, but I haven’t seen enough installs to know if they’re worth the extra cost.

That “potato chip” analogy is spot-on - once shingles get past a certain age, especially here in the Midwest, they just lose all flexibility. I’ve seen it plenty: try to do even a minor install or repair and you wind up with more broken pieces than you started with. The freeze-thaw cycles don’t do them any favors. Around 15 years is about where I start seeing consistent issues, too, though sometimes you’ll get a few more years if the roof’s been shaded or the original materials were decent.

About those synthetic shingles - I’ve had a chance to look at a couple installs over the last five years. They’re definitely not cheap, but there are some upsides. The big one is their resistance to cracking and curling; they stay flexible much longer than standard asphalt. I helped a neighbor put in a solar attic fan on his DaVinci synthetic roof last summer. Cutting into those was almost like working with thick rubber mats, and there wasn’t any of that brittle chipping you get with old asphalt. The downside is, they’re heavier and can be trickier to lay flat if your decking isn’t perfectly even.

Cost-wise, you’re probably looking at double or more compared to architectural asphalt. But the warranty is usually 40-50 years, and from what I’ve seen so far, they seem to hold up to hail and UV better. Still, it’s hard to say how they’ll look after 25+ years since most installs are pretty recent.

If you’re dealing with an older roof and thinking about cutting in vents or fans, I’d agree - just budget for shingle replacement around the work area. Sometimes you can get away with heating them up gently on a sunny day to coax a little flex back, but once they’ve gone brittle... not much you can do except patch and pray.

One thing I wish more people would consider: if your roof’s already near end-of-life and you want to add anything major (solar panels, fans, etc.), it might make sense to combine projects and re-roof first. Saves you from doubling up on labor costs - or worse, having to undo fresh work when the roof finally gives out.

Not sure synthetic is worth it for every house, but if you plan on staying put awhile - or want to avoid this “potato chip” problem down the line - it’s something to look at. Just be ready for sticker shock up front.

That “potato chip” thing is no joke. I tried to swap out a vent on my 18-year-old roof last fall and it was a mess - shingles just snapped if I even looked at them wrong. Ended up patching with whatever extras I could find in the garage. I hear you on the synthetic stuff being pricey, but honestly, after that experience, I’m tempted for next time. The upfront cost stings, but not having to deal with brittle shingles again sounds worth it if you’re planning to stay put.

Man, I can relate to that “potato chip” roof situation way too well. Mine’s about 17 years old and it’s basically a crunchy mess up there - just walking on it feels like I’m risking shingle confetti. I tried swapping out a bathroom vent last summer, and I swear, every time my hammer touched the roof, another piece cracked off. Ended up patching with a weird mix of leftover shingles, some of which didn’t even match.

I used to think synthetic was just marketing hype, but after that little adventure? I’m starting to see the appeal. Yeah, it’s pricey upfront, but if it means not crawling around on a roof that falls apart under your feet… maybe worth budgeting for it next time. I guess if you’re planning to sell soon, it’s harder to justify, but if you’re sticking around, avoiding those sketchy patch jobs sounds pretty good.

That said, the only thing that gives me pause is how hot those synthetic shingles can get in the sun - at least down here in Texas. Not sure if that’s just me overthinking it though.