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

“I usually recommend a careful inspection and, where possible, a primer - especially for older or weathered shingles.”

That’s spot on. I’ve seen peel-and-stick fail even on roofs that looked fine at first glance. Primer can feel like overkill, but it really does make a difference, especially if you’re dealing with any kind of dust or leftover granules. Freeze-thaw cycles are brutal - what sticks in September might be peeling by March. I’d rather spend an extra hour up front than chase leaks later.

I hear you on the primer front. I used to think it was just another upsell from the hardware store, but after dealing with a few “mystery leaks” in one of my older duplexes, I’m a convert. Those peel-and-stick products are like that one friend who promises to help you move and then bails halfway through - looks good at first, but not always reliable. Especially if you’re in a spot that sees a lot of freeze-thaw or wind-driven rain. A little extra prep now saves a ton of headaches (and ceiling stains) later.

Yeah, those peel-and-stick jobs seem quick but they just don’t hold up when you get a real storm. I learned the hard way too - thought I could skip the primer and ended up chasing leaks for months. A little extra work definitely pays off.

I get where you’re coming from, but I’ve actually had decent luck with peel-and-stick on a couple of installs - granted, I’m in a milder climate (coastal South Carolina), so maybe that’s part of it. The trick for me was making sure the surface was bone dry and rolling it down hard. I did use primer once and honestly didn’t notice much difference, but I can see how skipping it could be risky somewhere with harsher storms. Still, sometimes the “extra work” doesn’t always guarantee better results if the conditions are right. Just my two cents - sometimes shortcuts work, sometimes they don’t...

Still, sometimes the “extra work” doesn’t always guarantee better results if the conditions are right.

Funny how that works. I’m in the Midwest, and I tried peel-and-stick on my garage roof last fall. Thought I nailed it - surface was dry, temps were good, but after one gnarly thunderstorm, a corner started to lift. Maybe it’s just our wild weather, but I’m starting to think the “extra work” is worth it here. Not a fan of redoing stuff, especially when I thought I was being clever the first time...

Had a similar thing happen with a self-adhered membrane on my shed roof in early spring. Looked perfect at install, but Midwest freeze-thaw cycles got under the edge and it peeled right up after a windy rain. Sometimes the old-school manual sealing and extra fasteners really do pay off, even if it’s a pain up front. Weather just doesn’t cut you any slack around here.

- Totally get it - those self-adhered membranes seem great until Midwest weather gets involved.
- I’ve had peel-up issues even with “premium” brands. Once the wind finds an edge, it’s game over.
- Manual sealing is a pain, but honestly, I trust a bead of tar and some extra nails more than any “peel-and-stick” label.
- Not sure if it’s just our climate or what, but shortcuts rarely last through a full winter here.
- Only thing that’s held up for me is old-fashioned elbow grease and redundancy... maybe overkill, but at least I sleep better when the storms roll in.

Had the same headache last fall when I put in a solar attic fan - figured the peel-and-stick flashing would save me time, but the first big gust we got, it started curling up at the corners. I ended up going back up there with a tube of roofing cement and some extra screws. Maybe it’s overkill, but after seeing what Midwest wind can do, I just don’t trust those “easy” installs. Sometimes the old-school way is the only thing that holds up around here.

I hear you on the Midwest wind - those gusts will find any weak spot. I tried peel-and-stick flashing once on a ridge vent, and it barely lasted a season before peeling up. Ended up using metal flashing and good old roofing nails. Maybe it’s not as quick, but I’d rather spend the extra hour than worry every time there’s a storm rolling through. Sometimes “easy” just means “temporary,” at least around here.

Sometimes “easy” just means “temporary,” at least around here.

That line hits home. I’ve lost count of how many times I’ve seen “quick” installs come back to haunt folks, especially with anything roof-related in the Midwest. Those winds don’t mess around - if there’s a shortcut, they’ll find it and rip it right open.

Had a solar attic fan job last fall where the homeowner wanted to use one of those all-in-one flashing kits with adhesive backing. Looked simple enough, but I’ve seen too many of those peel up after a couple freeze-thaw cycles. Ended up convincing them to go with custom-bent aluminum flashing and proper fasteners, even though it took longer. Not the most fun working on a steep pitch in November, but that thing’s still bone dry after two nasty storms this spring.

I get why people want the peel-and-stick stuff - it’s tempting when you’re staring at a long Saturday and a pile of projects. But honestly, once you factor in the time spent fixing leaks or chasing down wind damage later, it’s not much of a shortcut. Especially if you’ve got older shingles or any unevenness on the roof deck - those adhesives just don’t grab like they claim.

One thing I’ve noticed: even some of the “pro” kits for solar fans are designed for milder climates. Around here, if it doesn’t have metal-to-metal contact and mechanical fasteners, I’m skeptical. Maybe overkill for some places, but I’d rather not gamble with water getting into the attic insulation.

Curious if anyone’s had luck with any of the newer synthetic flashings? I keep seeing them at supply houses but haven’t tried them yet - still sticking to metal for now.

I get where you’re coming from with the metal flashing and mechanical fasteners - definitely the safest bet for Midwest weather. But I’ll admit, I went with one of those newer synthetic flashing kits (the kind with the butyl adhesive and flexible membrane) on my garage roof last year. It’s a low slope, and I was honestly just tired of wrestling with sheet metal up there.

So far, it’s held up through a couple of pretty wild storms and a freeze-thaw cycle. No leaks yet, and it was way easier to get a tight seal around the odd angles. I did make sure to prep the surface really well and used extra fasteners at the edges, just in case. Maybe it’s not as bulletproof as custom-bent metal, but for smaller jobs or less exposed spots, I think the new synthetics are worth considering.

That said, I wouldn’t trust them on the main house roof or anywhere that gets hammered by wind. For those spots, yeah, metal all the way. Just figured I’d throw out a different experience - sometimes the “easy” option isn’t always temporary, depending on where and how you use it.

Maybe it’s not as bulletproof as custom-bent metal, but for smaller jobs or less exposed spots, I think the new synthetics are worth considering.

That’s a fair point - those butyl-based membranes have come a long way. Did you notice any issues with adhesion in the cold, or did it stick right away? I’ve seen a few cases where folks didn’t prep the surface enough and got some sneaky leaks months later. Sounds like you were pretty thorough, though. Curious if you checked under the membrane after that first big storm, or just trusted the “no drips” test? Sometimes I wish all roofs were as forgiving as a garage...

Curious if you checked under the membrane after that first big storm, or just trusted the “no drips” test?

I’ll admit, I’m a “trust but verify” type - especially after seeing what a surprise leak can do to attic insulation. After my last install, I actually popped a shingle and peeled back a corner just to make sure everything was bone dry. Maybe overkill, but I’ve seen too many jobs where folks just cross their fingers and hope for the best.

Those butyl membranes are definitely better than they used to be, but cold weather is still tricky. If it’s below 40°F, I’ll hit the surface with a heat gun or even just leave a tarp over it until the sun warms things up. Otherwise, you get that “sorta stuck” feeling, and months later - bam, water stains.

Honestly, nothing beats custom metal for peace of mind, but for a quick attic fan or a vent pipe, synthetics are a decent compromise. Just gotta prep like you’re painting a classic car, not slapping on a bumper sticker.

I’m with you on the “trust but verify” approach - seen way too many attic fans installed with just a bead of caulk and crossed fingers. I’ve actually found water tracking sideways under membranes after a wind-driven rain, even when everything looked fine from inside. Out of curiosity, do you ever see issues with ice damming around those synthetic membranes in colder climates? I’ve noticed some brands claim to self-seal, but I’m not convinced they’re all equal once temps drop.

I’ve noticed some brands claim to self-seal, but I’m not convinced they’re all equal once temps drop.

Yeah, I hear you on that. The “self-sealing” thing always sounds great on the packaging, but in real-world cold snaps, I’ve seen those membranes get stiff and not bond as well as advertised. Especially up here in the Midwest, where we get those freeze-thaw cycles - sometimes you’ll see a little ice dam form right at the edge of the membrane, and water finds its way in under the shingles anyway.

I’ve also noticed that some of the cheaper synthetics don’t seem to seal around nails as well when it’s below freezing. You poke a fastener through and it just kind of stays open, which isn’t ideal if you’re counting on that as your last line of defense.

Honestly, I still trust a good old-fashioned ice & water shield more than some of these newer synthetics, at least for the first few feet up from the eaves. Maybe I’m just old school, but I’d rather overdo it than risk a call-back in February when everything’s frozen solid.

I’m with you on the ice & water shield, especially in spots where leaks are most likely. I tried one of those “self-sealing” synthetics last winter and honestly, it felt like I was just stapling plastic wrap to my roof once it got cold. Maybe they work better in milder climates, but up north, I’d rather play it safe and stick with what’s proven. The peace of mind is worth a few extra bucks.

Couldn’t agree more about the ice & water shield, especially up here where freeze/thaw cycles just wreck everything. I tried one of those synthetic underlayments too - looked great in the store, but once the temp dropped, it was stiff as a board and didn’t seal worth a damn. Maybe it’s fine down south, but I’d rather spend a bit extra for something that actually works when it counts. After dealing with a leak right over my kitchen last winter, I’m not taking chances with “innovations” that haven’t stood the test of time.

I’ve seen that same issue with synthetic underlayments during inspections - once it gets cold, they just don’t lay flat or seal up right. Had a client last year who thought he was saving money, but ended up with water stains in the attic after the first real freeze. Sometimes the old-school stuff really does hold up better, especially around here where winter just keeps testing your roof.

I get where you’re coming from, but I actually went with synthetic underlayment last year because it was way cheaper and lighter to haul up there. We had a couple cold snaps and so far, no leaks or weird wrinkles. Maybe it depends on the brand or how careful you are with install? I just couldn’t justify the extra cost for felt when I was already stretching my budget.

We had a couple cold snaps and so far, no leaks or weird wrinkles.

That’s good to hear! I’ll admit, synthetic is a lot easier on the back - hauling rolls of felt up a steep pitch is nobody’s idea of fun. I do wonder about long-term durability though. I went with felt since my area gets wild temperature swings and I wanted something with a proven track record for breathability. But honestly, if your install went smooth and you’re not seeing issues, it sounds like you made the right call for your budget. Sometimes the “old school” way isn’t always the only way.