Where mice get into Overland Park homes
- Garage door corners. The bottom seal compresses in the middle and lifts at the ends; the gap at each corner is often bigger than a mouse needs. Fix: new bottom seal plus corner blocks or a threshold seal.
- Garage-to-house door. Often has no sweep at all. Fix: door sweep.
- AC line and utility penetrations. Refrigerant lines, cable, gas and electric enter through holes cut oversize and stuffed with foam years ago. Foam is chewable. Fix: pack with copper mesh, then seal over it.
- Dryer vent. The flapper sticks open or the sleeve has pulled loose from the hood. Fix: reseat the sleeve; replace the hood with one that closes; ¼-inch hardware cloth only where it won't trap lint.
- Siding-to-foundation gap. Where the bottom course of siding meets the foundation, especially at corners and behind downspouts. Fix: metal flashing or mesh backed with sealant.
- Sill plate gap. Where the wood frame sits on the concrete foundation. Visible from inside in an unfinished basement; hidden in a finished one. Fix: mesh and sealant from whichever side can be reached.
- Egress and basement window wells. Common in Johnson County; the well cover is missing, the window frame has shrunk, or the well itself is a pit that collects mice. Fix: well cover; ¼-inch hardware cloth around the frame; check the drain.
- Sump and radon penetrations through the slab. Fix: seal the annular gap around the pipe with mortar or metal collar.
- Soffit-to-wall junctions and roofline gaps. Where a lower roof meets a wall, and at soffit returns. This is also the squirrel and bat route, so it matters for more than mice. Fix: hardware cloth or metal; larger repairs referred.
- Exterior door thresholds. Look for daylight at the bottom corners. Fix: sweep and threshold adjustment.
- Plumbing penetrations under kitchen and bath cabinets. The interior side of #3 — where the supply and drain lines come through the cabinet floor or wall. Fix: escutcheon plates, mesh and sealant.
The list draws on the Johnson County K-State Extension's home-wildlife-proofing checklist (chimney cap, dryer and roof vent screens, window-well covers, door and window fit, soffits, mulch beds against the foundation, branches touching the roof, ivy on walls) — Wildlife-Proof Your Home.
Mouse and rat removal takes out the mice you have; exclusion closes the way in.
What we seal it with, and why
The rule is simple: a mouse can chew through anything softer than its teeth. Foam, caulk, plastic, rubber and wood are all on K-State's list of materials rodents get through. Metal and concrete are not.
| Material | Where we use it | Why rodents don't get through | Limitation |
|---|---|---|---|
| Copper mesh or stainless-steel wool, packed tight, with sealant over it | Utility and plumbing penetrations, small gaps at sill plate, around pipes | Mice won't chew metal; the sealant keeps the mesh in place and blocks air | Sealant alone fails; the mesh has to fill the void, not just cover it |
| ¼-inch (or smaller) galvanized hardware cloth | Foundation vents, window wells, soffit openings, behind vent hoods where lint isn't an issue | Openings smaller than a mouse can pass; rigid | Must be fastened at the edges, not just laid in place; edges need to be sealed to the surface |
| Sheet metal or metal flashing | Siding-to-foundation gap, corners, larger openings at grade | Rigid, unchewable | Needs proper fastening and a finished edge so it doesn't become its own gap |
| Mortar or hydraulic cement; metal pipe collars | Slab penetrations (sump, radon, floor drains), foundation cracks | K-State: foundation openings should be sealed with metal or concrete | Cracks that are moving need a foundation contractor, not a patch |
| Garage door bottom seal with corner blocks or a threshold seal | Garage door corners (#1) | Closes the gap that a flat seal leaves at each end | Wears; check yearly; a warped door or uneven slab still leaves a gap |
| Door sweeps and threshold adjustment | Garage-to-house door (#2), exterior doors (#10) | Removes the daylight gap at the bottom corners | Sweep must contact the threshold along its full length |
| Vent hoods that close; dryer sleeve reseated and clamped | Dryer vent (#4) | A closed flapper is a closed door | Don't put mesh where lint collects — it's a fire risk; fix the flapper instead |
What fails on its own: expanding foam, caulk, plastic, rubber, wood. K-State lists all of these as materials rodents will chew through. They have a place — foam and caulk over metal mesh, for air sealing — but never as the barrier itself.
Source: K-State Research and Extension MF1123, Controlling House Mice (materials); Johnson County K-State Extension, Wildlife-Proof Your Home (vent screens, well covers, door fit).
Finished basements, egress wells and sump pits
Two things make a finished basement harder.
You can't see the wall. In an unfinished basement you walk the rim joist with a flashlight and find the gap. Behind drywall, the first sign is usually sound, not sight — scratching in a wall or ceiling. So the opening has to be found from outside, at grade, at the garage, at the utility penetrations and at the window wells.
It gives them a highway. Soffits, dropped ceilings and wall voids run the length of the house, so a mouse that gets in at the garage can be in a bedroom wall the same night.
Egress wells get their own check: cover present and intact, ¼-inch hardware cloth around the frame, drain clear, no gap where the well meets the foundation. Sump and radon pipes through the slab are sealed at the annular gap.
What you'll receive
Before we leave you get a one-page written findings sheet. It lists every entry point we found, numbered to match the diagram above; what we sealed today and with what; what we recommend but didn't do (and whether that's us or a contractor); and the follow-up date.
Example — not a real job
Rodent inspection findings — Example
Property: [example — two-story, attached garage, finished walkout basement] Areas inspected: exterior perimeter at grade; garage interior; mechanical room; under kitchen sink; basement ceiling (accessible portions) Activity found: fresh droppings under kitchen sink and along north garage wall; grease rub on garage-to-house door threshold; no attic activity
Entry points found (numbers match the diagram)
| # | Location | What we found | Sealed today? | Material |
|---|---|---|---|---|
| 1 | Garage door, both bottom corners | ½-inch daylight gap each side; seal compressed in the middle | Yes | New bottom seal + corner blocks |
| 2 | Garage-to-house door | No sweep | Yes | Door sweep |
| 3 | AC line set, east wall | Oversize hole, old foam, chewed | Yes | Copper mesh + sealant |
| 7 | Egress well, north | No cover; ¾-inch gap at frame | Partly | Hardware cloth at frame; cover recommended (see below) |
| 5 | Siding-to-foundation, NE corner | ⅜-inch gap, 14 inches long | Yes | Metal flashing + sealant |
Traps placed: 8 snap traps — 4 garage north wall, 2 under kitchen sink, 2 mechanical room along rim
Recommended, not done today
- Egress well cover (#7) — provider to be confirmed
- Trim mulch back from foundation, north side — homeowner
Not sealed, and why
- Sill plate behind finished basement drywall, south wall — not accessible without opening drywall; no activity found on that side; monitor at follow-up
Follow-up: [example date to be agreed] — check traps, re-inspect sealed points, confirm no new droppings
Questions
Does exclusion actually work? Yes, when the entry points are found and closed with the right materials. It fails when an opening is missed or when it's closed with foam or caulk alone. That's why the findings sheet lists what was sealed and what wasn't — so you know where the risk is.
Can you guarantee I'll never have mice again? No, and be careful with anyone who does. Houses move, seals wear, new work opens new gaps, and a home bordering open ground gets tested every fall. What we can do is close what's open today, tell you what we couldn't, and explain which openings remain.
Do I need my attic re-insulated? See the CDC’s guidance on cleaning up after rodents.
I already had a treatment. Can you just do the sealing? Yes. Tell us what was done and when on the quote form — there's a field for it.
RODENT CONTROL · OVERLAND PARK
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