- Had the same issue with brush inserts—squirrels just treat them like a hammock.
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That’s for sure. Pulled out a whole mouse nest last fall, and it was basically a five-star hotel in there.“Not exactly critter-proof.”
- Switched to stainless mesh too. It’s tougher, but yeah, if you don’t clear it before the freeze, you’re still dealing with ice dams.
- I do a quick check every season: look for sagging, rust spots, or anything chewed. If it’s bent or clogged, I just swap it out—saves headaches later.
I get the appeal of stainless mesh, but honestly, I’ve seen critters chew right through some of the thinner stuff if they’re determined enough. If you’re in a spot with heavy squirrel traffic, heavier gauge or even solid covers might be worth a look. Mesh is great for airflow, but it’s not always a silver bullet against pests.
I’ve run into this exact issue on a few attic inspections. The lighter stainless mesh looks solid at first glance, but if you look close—especially around soffit vents or roofline gaps—you’ll sometimes spot gnaw marks or even small holes. Squirrels and raccoons are surprisingly persistent.
“Mesh is great for airflow, but it’s not always a silver bullet against pests.”
Couldn’t agree more. I remember one job where the homeowner had used a fine mesh over their gable vents, thinking it’d be enough. Within a year, squirrels had chewed a hole big enough to squeeze through. We ended up swapping it for a heavier gauge hardware cloth, and even added a solid metal flashing behind it for good measure. Airflow dropped a bit, but the pest problem stopped cold.
It’s always a trade-off between ventilation and critter-proofing. If you’re in an area with heavy wildlife activity, I’d lean toward overbuilding those barriers. Sometimes the extra peace of mind is worth a little less airflow, especially if you’ve already got decent attic ventilation elsewhere.
“It’s always a trade-off between ventilation and critter-proofing.”
That’s the tricky part, isn’t it? I’ve had similar headaches with soffit vents—those thin aluminum screens look fine until you get up close and see daylight peeking through where something’s chewed. I’ve started making it a habit to run a flashlight along all the vent edges during my seasonal checks. Any sign of fraying or tiny holes, I just swap out the mesh for 1/4" hardware cloth. It’s not perfect for airflow, but honestly, I’d rather deal with a slightly warmer attic than another round of squirrels in the insulation.
One thing I’ll add: if you’re layering heavier mesh or flashing, make sure you’re not blocking off too much ventilation, especially if you’ve got a ridge vent system. I once went a little overboard and ended up with condensation issues in winter. It’s a balancing act for sure, but I’d rather patch a vent than chase raccoons out of the rafters again...
“I’d rather deal with a slightly warmer attic than another round of squirrels in the insulation.”
That’s pretty much where I landed too, after a couple years of playing whack-a-mole with mice and chipmunks. I tried those cheap plastic vent covers once—never again. Something chewed right through them in a month, and I found a stash of acorns in my soffit. Lesson learned.
I do agree about not going overboard with the hardware cloth though. First time I doubled up on mesh, I didn’t realize how much it would choke off airflow until I noticed frost on the underside of my roof sheathing mid-winter. Had to backtrack and open things up again, which was a pain.
One thing that’s helped me is using stainless steel staples instead of regular ones when attaching new mesh. The regular ones rusted out way faster than I expected, especially with all the humidity we get here. Not sure if it’s overkill, but at least I haven’t had to redo any sections since.
It really is a balancing act—too tight and you get moisture problems, too loose and you’re running a wildlife hotel.