Sealing up those gaps is definitely step one—totally agree there. I’ve seen way too many folks dump money into fancy vent systems, but then they’ve got half-inch cracks around the attic hatch or plumbing stacks and wonder why their energy bills are nuts. Air leaks are sneaky like that.
On the gable vent thing, I’m with you... mostly. I manage a bunch of older properties, and some have both ridge and gable vents. Most of the time, it’s fine, but I did run into one house where the wind would actually push rain in through the gables during storms. Not common, but it happens. We ended up adding baffles and some weather stripping, which helped a lot.
Soffit intake is huge—people forget about it all the time. You can have all the exhaust vents in the world, but if nothing’s coming in at the bottom, you’re just spinning your wheels. I had a place where insulation was stuffed right up against the soffits from a previous owner’s “upgrade.” Attic was roasting in summer and freezing in winter. Pulled that back, added some vent chutes, and it made a noticeable difference.
One thing I’d add: check your attic after a big rain or snow melt. Even if things seem dry most of the year, sometimes you’ll spot water stains or damp insulation that only show up after certain weather. That’s usually when you find out if your airflow setup is working or if you’ve got a hidden leak somewhere.
Not sure what kind of roof you’re working with, but I’ve noticed low-slope roofs seem to be pickier about ventilation than steep ones. Maybe it’s just me, but I always double-check those for any signs of moisture or mold.
Anyway, sounds like you’re on top of it. Just don’t trust that “if it ain’t broke” thing too much—sometimes attics hide problems for years before they show up as bigger headaches down the line.
Soffit intake is huge—people forget about it all the time. You can have all the exhaust vents in the world, but if nothing’s coming in at the bottom, you’re just spinning your wheels.
That’s the part that gets missed constantly. I’ve lost count of the number of times I’ve opened up an attic and found insulation blocking every soffit vent. Folks mean well, but it’s like they’re trying to turn the place into a cooler, not a ventilated space. I’ll add: even when soffits are clear, sometimes the vent covers outside are painted over or clogged with old wasp nests. Worth checking from both sides.
On the gable vent/ridge vent combo, I’ve had mixed results too. Some houses just seem to get away with it, but I’ve had a couple where it caused weird airflow and condensation issues, especially in our humid summers. I’m not convinced there’s a one-size-fits-all answer.
You mentioned low-slope roofs—those are always a pain. Less stack effect, less natural draw, so any little mistake with vent layout or air sealing just gets magnified. I’ve started using humidity sensors up there, just to catch problems before they turn into mold.
Curious if you’ve ever tried those solar-powered attic fans? I’m skeptical, but people keep asking if they’re worth it.