How do you keep your roof from splitting in extreme weather?

After a heavy snow, look for uneven melt patterns on the roof. That’s usually a sign of heat loss.

That’s a solid tip. I’ve seen so many folks focus on shingle type or underlayment, but ignore what’s going on underneath. You nailed it - attic insulation and ventilation are huge, especially with older homes. I’ve worked on a bunch of 50s-60s ranches and it’s almost always the same story: patchy insulation, blocked vents, and then you get ice dams or shingle splits.

One thing I’d add - sometimes people add insulation but forget about air sealing around light fixtures or attic hatches. Warm air sneaks through those gaps and you still get hot spots. Ever notice frost around can lights in the attic? That’s a giveaway.

Curious if anyone’s tried those smart attic fans that kick on automatically when temps spike? I’ve seen mixed results, especially in humid climates. Wondering if they help or just move the problem around.

Curious if anyone’s tried those smart attic fans that kick on automatically when temps spike? I’ve seen mixed results, especially in humid climates.

I’ve seen those fans in action on a couple jobs. Honestly, in our area (pretty humid summers), they seemed to just pull more moist air into the attic and made things worse. One homeowner ended up with mold around the rafters. I’d say sealing up gaps and making sure vents aren’t blocked did more for keeping the roof in shape than any fan ever did. Sometimes the old-school fixes just work better.

I actually went down the rabbit hole with those smart attic fans last summer when we moved in. The idea sounded great - let the fan do the thinking, right? But after reading a bunch of horror stories about mold and warped rafters, I chickened out. Our place is in the southeast, so humidity is a real beast.

What’s worked for me so far is a combo of old-school and a bit of trial and error. First thing I did was crawl up there and check for any daylight peeking through - found a couple gaps around the soffits and sealed those up with some foam. Then I made sure the ridge vent wasn’t blocked by insulation (turns out, previous owner just shoved batts right up against it...).

I also added a humidity sensor just to keep an eye on things. Haven’t had any splitting or leaks yet, knock on wood. I’m not saying the fans are all bad, but in a muggy climate, I’d rather focus on airflow and sealing than risk pulling in more damp air. Sometimes the low-tech fixes are just less stressful.

You nailed it with the ridge vent and soffit check. I can’t tell you how many times I’ve seen folks spend big on fancy fans, only to end up with more headaches - especially down here where the air feels like soup half the year. Had a job last spring where a smart fan actually pulled in so much humid air, the plywood started to delaminate. Sometimes it’s just about making sure nothing’s blocked and letting things breathe naturally. Low-tech doesn’t mean low-quality, in my book.

I get where you’re coming from, but I’ve actually had the opposite issue with just relying on passive vents. Here in the Midwest, we get wild temp swings, and sometimes the natural airflow just isn’t enough - especially on low-slope roofs. Ended up with ice dams one winter that wrecked my gutters and part of the deck. Ended up installing a humidity sensor with a powered vent, but only use it when things get really bad. Not saying it’s for everyone, but sometimes a little tech can save you from bigger headaches down the road.