I get the hesitation with metal vents, but honestly, rust hasn’t been a big issue for me—at least not in the first decade or so. I’ve got a couple galvanized ones on my old shed, and they’re still holding up after 12 winters. The bigger headache’s been condensation dripping down onto my stuff when we get those wild temperature swings. I tried insulating around the vent collar last year, which helped a bit, but it’s not perfect.
Plastic vents are a mixed bag. The standard ones from the big box stores turned brittle and cracked after maybe five years—especially on the north side where snow piles up and then melts/refreezes. I did try one of those “eco” recycled plastic models as a replacement, thinking it’d be tougher, but honestly, it didn’t seem much different in practice. Maybe it faded less? Still got brittle eventually.
Mixing vent types is an interesting idea—I haven’t done it myself, but I can see how you might get some benefits if you put metal on the sunniest side (where plastic would degrade fastest) and plastic elsewhere. Only thing is, you end up with mismatched looks and possibly different airflow rates, depending on the style.
One thing I’ll say: whatever vent you pick, make sure to check the seals every spring. Vermont weather finds every weak spot eventually... I learned that one the hard way after a March thaw sent water right through a cracked vent base.
If you’re worried about rust but want durability, maybe look at powder-coated aluminum? Costs more upfront but seems to dodge both rust and most condensation issues for me so far. Just my two cents—nothing’s perfect in this climate, but some options hold up better than others.
Interesting you mention powder-coated aluminum—have you noticed any issues with the paint chipping or fading over time? I’ve been eyeing those for my next project, but wasn’t sure if they’d hold up to UV and ice as well as advertised. Also, with the mushroom-style vents, does anyone else get worried about snow piling up around them and blocking airflow? I had a regular low-profile vent get iced over last February and it basically stopped working till the thaw. Wondering if the taller design helps or just makes it more of a target for drifting snow...
I’ve managed a couple of sheds with those mushroom vents, and honestly, I’m still on the fence. The powder-coated aluminum ones haven’t chipped or faded on me yet, but it’s only been about three years. That said, we’re in the upper Midwest, so they get plenty of sun and snow. I do see some minor dulling where the snow sits for weeks, but nothing dramatic so far.
About the snow buildup—yeah, that’s a real concern. The taller design does keep the vent above light drifts, but during one of our heavier storms last year, I noticed the snow actually curled up around the base and started to block airflow anyway. Not as bad as the low-profile vents icing over, but still not perfect. I ended up knocking snow off a couple times just to be safe.
I’m not convinced the mushroom style is a magic fix for winter issues. Maybe better than flat vents, but if you get a lot of drifting, it’s still something to watch. Anyone tried adding a wind baffle or shield around them? Wondering if that’d help with the drifting problem...
The taller design does keep the vent above light drifts, but during one of our heavier storms last year, I noticed the snow actually curled up around the base and started to block airflow anyway.
That’s been my experience too. I thought the extra height would solve it, but after a couple big storms, I was still up there with a broom. Never tried a wind baffle, but I did once wrap some old plastic garden edging around the base—looked ridiculous, but it actually helped a bit with the drifting. Not a long-term fix, though. The vents themselves have held up fine, just wish they handled snow better.
I did once wrap some old plastic garden edging around the base—looked ridiculous, but it actually helped a bit with the drifting.
That’s hilarious—I’ve done the same thing with a chunk of leftover plywood. Looked like my shed had a weird hat for half the winter, but it did keep the snow from piling up right at the vent. Honestly, I’m starting to think the only real fix is to move somewhere with less snow... or just accept that broom duty is part of winter shed maintenance. The vents work fine otherwise, but yeah, snow management is a pain.