You nailed it—if you’re seeing leaks, baffles are the least of your worries. I’ve managed a few older properties where we tried both foam and cardboard, and honestly, neither’s perfect if you’re dealing with a drafty attic or questionable roof. Cardboard’s cheap and easy to swap, but yeah, it’ll turn to mush if things get wet. Foam’s a little sturdier but can get chewed up by critters or just fall apart over a couple seasons.
I’m with you on keeping vents clear. I’ve seen way too many folks try to just pile up insulation and hope for the best, then wonder why they’re dealing with ice dams and water stains. It’s a pain, but checking those eaves every fall has saved me a ton of headaches. Moldy insulation is a nightmare—once you’ve had to rip all that out, you get real motivated to keep things dry.
Honestly, the best trick I’ve found is just staying on top of the basics. It’s not glamorous, but it works.
- 100% agree on not just piling up insulation. Seen way too many folks try that shortcut, then act surprised when the ceiling starts dripping come January.
-
— Couldn’t have said it better. I crawl up there every October, flashlight in hand, just to make sure nothing’s blocked or soggy. Not fun, but it beats tearing out moldy batts mid-winter.“It’s a pain, but checking those eaves every fall has saved me a ton of headaches.”
- On the baffle debate: I’ve tried both foam and cardboard too. Honestly, if your attic’s got leaks or critter issues, neither lasts long. Foam’s better for moisture but mice LOVE chewing through it. Cardboard’s a joke if you get any condensation.
- One thing I’d add: I started using those plastic baffles (the ones that look like a wavy sheet). They’re a pain to install if your rafters are tight, but they hold up better than foam or cardboard in my experience. Haven’t had one collapse yet, even after a few rough winters.
- Roof type matters. My old place had a low-slope asphalt roof and it was an ice dam magnet. Switched to metal when I finally re-roofed—pricey, but no more ice dams and snow slides right off. Not for everyone, but worth considering if you’re already replacing shingles.
- For anyone in colder spots—heat cables along the eaves can help if you’re desperate, but they’re really just a band-aid. If you’re seeing ice dams every year, it’s probably an insulation/ventilation issue, not just the outside temp.
- Quick tip: I keep a cheap humidity sensor up in the attic now. If it spikes, I know something’s leaking or not venting right before it gets out of hand.
- Last thing—don’t forget about bathroom/kitchen vents dumping warm air into the attic. Sealed mine up with foil tape and insulated ducting after realizing half my problem was from steamy showers.
Not glamorous work, but like you said, staying on top of the basics keeps the big headaches away.
- Gotta say, I’m not totally sold on metal roofs as the magic fix for ice dams. Sure, snow slides off easier, but I’ve seen plenty of metal roofs with monster icicles hanging off the eaves—especially if the insulation and venting underneath aren’t dialed in.
- Heat cables… yeah, they’re a patch, but sometimes you just need a quick fix if you’re mid-winter and can’t tear into the attic.
- Anyone tried green or “living” roofs in cold spots? My neighbor put one in—lots of upfront work, but he swears it keeps temps and moisture way more stable. Not cheap, but less drama with ice buildup so far.
- Plastic baffles are decent, but I’d watch for warping if your attic gets real hot in summer. Had a couple twist on me after a heatwave.
- Still think air sealing is the unsung hero here… insulation’s great, but if warm air’s leaking up, you’re fighting a losing battle.
I’ve noticed the same thing with metal roofs—if the attic’s not sealed up tight, you still get those crazy icicles. One place I worked on, we found gaps around the bathroom vent and a couple light fixtures that were letting warm air right up under the roof deck. Once we sealed those and beefed up the insulation, the ice dams pretty much disappeared, even though it was an older shingle roof. Curious if anyone’s tried using spray foam for air sealing instead of just caulk and weatherstripping? Wondering if it’s worth the extra cost in the long run.
Curious if anyone’s tried using spray foam for air sealing instead of just caulk and weatherstripping? Wondering if it’s worth the extra cost in the long run.
- Used closed-cell spray foam on a couple of attic jobs last winter (northern MN, brutal cold). It definitely sealed up spots that caulk just couldn’t touch, especially around weird framing and old wiring holes.
- Noticed way fewer ice dams after, but it’s pricey. Like, 2-3x more than just doing caulk and batt insulation.
- One thing—if you ever need to run new wires or fix something up there, spray foam is a pain to cut through. Not impossible, just messy.
- I’d say it’s worth it if you’ve got a really drafty old house or you’re already gutting the attic. For newer builds or minor leaks, caulk and weatherstripping might be enough.
Has anyone tried the DIY spray foam kits? I’ve only used pro crews so far. Wondering if they’re actually any good or just make a mess...