Interesting you mention the solar fan housing—mine started to yellow and get brittle after just two summers. Have you noticed any difference in attic temps since blocking off the gables? I’ve always wondered if that makes a bigger impact in humid climates versus dry ones.
I actually blocked off my gables last fall after reading a bunch of mixed advice. I’m in the Midwest, so it gets humid, and honestly, I haven’t noticed a huge drop in attic temps—maybe a couple degrees? But I did see less dust blowing in, which was a plus. Did you see a bigger change in your attic temps, or was it more about moisture control?
I actually blocked off my gables last fall after reading a bunch of mixed advice. I’m in the Midwest, so it gets humid, and honestly, I haven’t noticed a huge drop in attic temps—maybe a couple degrees? But I did see less dust blowing in, which was a plus.
You’re not alone there. Blocking off gable vents is one of those things that sounds like it’ll make a night-and-day difference, but most folks just get a little less dust and maybe a slightly less drafty attic. I’ve seen a lot of attics where people expected to turn their upstairs into a meat locker, but… nope. Maybe a couple degrees, like you said. If you’re lucky.
For me, the bigger deal has always been moisture control. In the Midwest, humidity’s the real troublemaker. I’ve seen attics with gables blocked and good soffit/ridge venting stay bone dry, even after a week of summer storms. But if you block off the gables and don’t have enough intake or exhaust elsewhere, you can end up with condensation on the rafters—looks like your attic’s got a cold sweat. Not fun.
The dust thing is underrated, though. I had one homeowner who swore her Christmas decorations came out looking like they’d been through a sandstorm every year until she blocked her gables. After that—just regular attic funk.
If you’re not seeing mold or damp insulation, and your roof deck isn’t getting that musty smell, you’re probably in good shape. But yeah, don’t expect miracles on the temp front unless you’ve got some serious airflow upgrades elsewhere. I always tell people: attic ventilation is more about keeping things dry than keeping things cool. If you want a cold attic in July, you’ll need more than just vent tweaks—maybe a time machine.
Curious if you’ve checked your soffit vents lately? Sometimes they get clogged with insulation or even bird nests (ask me how I know…). That can make a bigger difference than anything you do up top.
attic ventilation is more about keeping things dry than keeping things cool
Couldn’t agree more. People obsess over attic temps, but honestly, moisture is the real enemy—especially if you care about roof longevity or want to avoid mold. I’d add: if you ever re-roof, consider a solar-powered vent or even a green roof system. Both can help with temp swings and humidity, though they’re not cheap. But yeah, blocked soffits are way more common than folks realize... I’ve pulled out literal bird skeletons before.
Funny you mention the bird skeletons—last summer I found a petrified squirrel wedged right up against a soffit vent. Not exactly what you want to see when you’re poking around in someone’s attic. I get why people fixate on heat, especially down here in the South where the attic feels like a sauna most days, but honestly, I’ve seen way more damage from trapped moisture than from high temps. Wet insulation, moldy rafters, even rusty nails bleeding through the decking... it all starts with poor airflow.
I’m not totally sold on solar-powered vents, though. Maybe I’m just old school, but I’ve seen a few where the motor died and nobody noticed for months. Then you’re back to square one, or worse, because now you’ve got a hole in your roof and no air moving. Anyone actually had one last more than five years? I’d love to be proven wrong.
Blocked soffits are a classic. People insulate right over them or let leaves pile up outside, and suddenly there’s nowhere for air to come in. I always tell folks: if you can’t see daylight through your eaves from inside the attic, something’s probably off. But then again, too much airflow isn’t great either—had one house where the wind was so strong it literally sucked insulation out through the ridge vent. That was a first.
Green roofs sound cool in theory but I can’t imagine trying to maintain one here—humidity’s already a nightmare and now you’ve got soil and plants up there? Maybe in Seattle or somewhere milder.
Curious if anyone’s tried those baffle systems that supposedly keep insulation out of the soffits? Worth it, or just another thing to clog up with dust and critters?
