What should be done under the floor to deal with mice? - briefly
Install a sturdy metal or heavy‑duty polyethylene liner beneath the subfloor and position snap traps or bait stations along the concealed perimeter. Seal all gaps, vents, and utility openings with steel wool and caulk to prevent further intrusion.
What should be done under the floor to deal with mice? - in detail
Inspect the subfloor space thoroughly. Identify entry points, damage, and signs of activity such as droppings, gnaw marks, and nesting material. Seal all openings larger than ¼ inch with steel wool, copper mesh, or cement‑based filler; these materials resist chewing. Apply a continuous barrier of expanding polyurethane foam in gaps around pipes, vents, and conduit openings, then trim excess to maintain a smooth surface.
Implement a trapping system directly on the floor joists or within crawl‑space walls. Use snap traps or multi‑catch devices positioned along walls, behind insulation, and near known runways. Bait each trap with high‑fat items—peanut butter, bacon, or sunflower seeds—to increase capture rates. Replace or reposition traps weekly based on activity.
Deploy bait stations in concealed locations, ensuring they are tamper‑resistant and comply with local regulations. Load stations with anticoagulant or non‑anticoagulant rodenticides, and monitor them at least twice per week. Record placement coordinates and removal dates for accountability.
Reduce attractants by eliminating food sources. Store pet feed, birdseed, and bulk dry goods in metal containers with tight‑fitting lids. Install a drip‑free sink and repair any leaking pipes to prevent moisture accumulation, which encourages nesting.
Consider an ultrasonic deterrent system mounted on the subfloor ceiling. Position devices at intervals recommended by the manufacturer, typically 10–15 feet apart, to create overlapping coverage. Verify that the units operate continuously and replace batteries or modules as required.
Maintain a regular inspection schedule. Every three months, repeat the gap‑sealing audit, assess trap performance, and refresh bait supplies. Document findings in a log to track trends and adjust the control strategy accordingly.