Foundation Vent Screening in Provo, UT

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Foundation Vent Screening, Done Right

A foundation vent is a hole in your house on purpose. It lets air circulate through the crawl space so moisture doesn't build up under the floor. The only thing that makes that hole safe is the screen behind it — and on a surprising number of Provo homes, that screen is torn, rusted, pushed in, or gone entirely. Older homes near downtown and the BYU neighborhoods are the worst for it: decades of painters, plumbers, and cable installers working in the crawl space knock screens loose, and nobody ever puts them back.

For a rat, an unscreened vent is an open garage door. For a mouse, even a partially torn one is plenty. Once rodents are in the crawl space, the rest of the house is close: pipes and wiring pass up through the floor with gaps around them, and the warmth rising from below makes the crawl space a comfortable base camp all winter. Vent screening is one of the simpler jobs in rodent exclusion — and one of the most commonly skipped.

How We Get It Done

We check every vent, from both sides. From outside, we look for visible damage, missing covers, and gaps around the frame. From inside the crawl space, we check where screens actually fail first — and look for droppings, nesting, and runways that show whether the vents have already been used as entries.

Then we fit proper screening. Each vent gets galvanized hardware cloth with quarter-inch mesh, cut to the opening and fastened securely so it can't be pushed in. Quarter-inch mesh is the key spec: it stops mice (which need about a quarter-inch gap, so the mesh openings leave them no purchase to squeeze or gnaw through) while letting air move almost as freely as an open vent. Where vent frames themselves are rotted or broken, we flag them — screening over a crumbling frame won't hold, and you'd rather hear that from us than discover it later.

We also check the crawl space access door while we're there. A loose access hatch is the same problem in a bigger size, and it makes no sense to screen every vent and leave it open.

Signs You Need Foundation Vent Screening

Droppings or nesting in the crawl space, especially near the vents. Scratching under the floor rather than in the walls or attic — crawl space activity sounds different, lower and closer. Visibly damaged vent covers on the outside of the foundation. A musty, animal smell near floor vents or in the lowest rooms of the house. Recent work under the house — plumbing, ductwork, earthquake retrofitting — that may have displaced screens. And on older Provo homes, simply never having had the vents checked is reason enough; original screens from decades ago rarely survive intact.

Honest Advice Before You Book

This is genuinely one of the more DIY-able exclusion jobs: hardware cloth and a staple gun will beat a torn screen any day. If you do it yourself, use galvanized quarter-inch hardware cloth, fasten it on the inside face where you can, and don't use window screen — it looks similar and stops nothing with teeth. Where we'd caution you is the inspection half: the value isn't only the mesh, it's knowing whether rodents are already living under there, because screening vents with animals inside the crawl space just relocates the problem. If there's active infestation, removal comes first. And remember vents are one line item in a full audit — our proofing walkthrough covers the garage, roofline, and penetrations that matter just as much.

What the crawl space tells us while we're down there. A vent screening visit puts eyes in the one part of the house most owners never enter, and the crawl space usually has more to report than the vents. We note where droppings and runways concentrate — which tells us the travel routes — whether insulation has been nested in or pulled down, and whether plumbing penetrations up through the floor are open, since those are the crawl space's internal doors into the walls. None of that obligates you to more work; it simply means you get the real picture of the space instead of a guess from the yard. Homeowners are often surprised how much of their "mystery noise" problem reads clearly from down there.

Foundation Vent Screening FAQs

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