I’ve seen this play out a lot, especially with those 60s ranches and their low slopes. Folks think more insulation is the cure-all, but if the airflow’s not right, you just trap more warm air up there and end up with frosty nails or even mold if you’re unlucky. I remember a job last winter—similar setup, homeowner had doubled up on insulation but was still getting ice dams. Turned out the soffit vents were basically blocked by old insulation and dust, so air wasn’t moving at all.
Heat cables can help in a pinch, but yeah, feels like putting a band-aid on it. Plus, they’re not cheap to run and don’t fix the root problem. Have you checked if your soffit vents are clear? Sometimes even adding a few extra roof vents helps, though I know that’s tough with a shallow pitch. Ever thought about those baffle things to keep the insulation out of the eaves? That’s helped some folks I know, but I’m curious if anyone here’s actually gotten rid of ice dams for good on a low-slope roof.
Heat cables can help in a pinch, but yeah, feels like putting a band-aid on it. Plus, they’re not cheap to run and don’t fix the root problem.
Couldn’t agree more with this. I bought my first house last year (yep, 60s ranch, low slope), and the previous owner swore by heat cables. They did keep the ice dams down, but my electric bill was wild and I still had water stains inside by spring. Turns out, the attic was basically sealed up tight—no airflow at all. I had a roofer come out and he found every soffit vent packed with insulation and spiderwebs.
I tried those foam baffles you mentioned to keep the insulation out of the eaves, and honestly, that made a bigger difference than anything else I’ve done. It’s not perfect—still get some icicles—but way less drama than before. I do think people underestimate how much proper venting matters compared to just piling on more insulation. If you can get even a little air moving up there, it really helps.
Not sure there’s a true “forever fix” for these old low-pitch roofs, but clearing vents and using baffles is about as close as I’ve gotten so far.
If you can get even a little air moving up there, it really helps.
That’s been my experience too. I once joked my attic was more sauna than storage—insulation everywhere, zero airflow, and ice dams that looked like modern art. After clearing out the soffits and adding baffles, things improved a ton. Heat cables felt like paying extra for the privilege of not fixing the real issue. Venting isn’t glamorous, but it’s underrated for sure.