Battling winter roof woes: heat cables vs. more insulation?

Spray foam’s been on my radar too, but yeah, the sticker shock is real. I ran the numbers for my place (1950s ranch, northern MN, lots of roofline) and the payback was like 12+ years, even factoring in energy savings. That’s a long time to wait, especially if you’re not planning to stay put forever.

Heat cables are definitely a quick fix, but I get nervous about relying on them long-term. My neighbor’s had his short out mid-winter and it was a mess. Still, when you’re staring at a $6k insulation quote vs. $300 for cables, it’s hard to argue with the budget option.

I guess for me, it comes down to how bad the ice dams are and whether I can patch things up for another year or two. If you’re already losing heat like crazy, maybe bite the bullet on insulation. Otherwise, I’m just trying to keep things safe and dry until I can afford the big upgrade.

- That 12+ year payback is pretty typical for spray foam in older homes, especially with complex rooflines.
- Heat cables are a band-aid - helpful short-term, but as you mentioned,

“my neighbor’s had his short out mid-winter and it was a mess.”

Reliability can be hit or miss, especially if they’re not installed right or get buried under snow.
- If ice dams are minor and you’re not seeing leaks or major heat loss, patching for a couple years makes sense.
- But if you’re already seeing water stains or attic frost, insulation (even blown-in cellulose as a cheaper option) might save you headaches down the road.
- One thing I see missed a lot: check attic ventilation too. Sometimes adding more vents helps almost as much as insulation for ice damming.
- If you go with cables, make sure they’re on a GFCI circuit and check them before the deep freeze hits.

I’ve seen heat cables work, but only when folks are really diligent about checking them. Like you said,

“Reliability can be hit or miss, especially if they’re not installed right or get buried under snow.”

I’ve had tenants unplug them by accident or pile stuff in the attic and block vents - suddenly, ice dams everywhere. Honestly, blown-in cellulose is underrated for older homes. Not glamorous, but it’s saved me from a few mid-winter emergencies. Ventilation’s a big one too... sometimes it’s just a matter of adding a couple more soffit vents and calling it a day.

I get why people like blown-in cellulose, but I’m not totally sold on it being the answer for every older house. We just bought a 1960s ranch last year (asphalt shingles, low-ish slope, Midwest winters), and the inspector said the attic had plenty of insulation - like, R-49 or something. Still got ice dams on the north side after our first real cold snap. No leaks, but those icicles were sketchy.

What surprised me was how much difference air sealing made compared to just piling on more insulation. We found gaps around the bathroom fan and some weird holes near the chimney that were letting warm air up into the attic. After sealing those up with spray foam and some caulk, things improved a lot - even before we added more vents.

I’ve looked at heat cables too, but honestly, they seem like a band-aid if you’ve got bigger issues with airflow or heat loss. Plus, I’d probably forget to check them half the time... I can barely remember to unplug my Christmas lights.

Not saying cellulose is bad - it’s definitely better than nothing - but I wonder if people sometimes skip over fixing drafts and ventilation because it’s less visible work? Or maybe it’s just easier to blow in more insulation and call it good. For us, tracking down all those little leaks was kind of a pain, but it seemed to help more than just adding another layer up there.

Curious if anyone else had luck with air sealing vs. just boosting insulation? Maybe it depends on roof shape or climate...

I wonder if people sometimes skip over fixing drafts and ventilation because it’s less visible work? Or maybe it’s just easier to blow in more insulation and call it good.

That’s exactly what I noticed when we moved into our place. The previous owners just kept adding insulation, but there were obvious gaps around the attic hatch and some wiring holes. Once we sealed those up, the upstairs felt way less drafty, and our heating bill dropped a bit. I get why people like cellulose, but if you don’t deal with the leaks first, it’s kind of like wearing a thick coat with the zipper wide open. Heat cables seem like a last resort to me - more of a patch than a fix.