How to get rid of mice under drywall in a house? - briefly
Seal all gaps and openings in the drywall and surrounding structure, then install «snap traps» or «bait stations» in the affected cavities, checking them daily. If infestation persists, hire a «licensed pest‑control service» to apply rodent‑proofing measures and targeted extermination.
How to get rid of mice under drywall in a house? - in detail
Eliminating rodents that have taken shelter behind interior wall sheathing requires a systematic approach.
Begin with inspection. Locate entry points by examining the exterior foundation, eaves, and utility penetrations. Look for gnaw marks, droppings, and fresh burrows near the base of walls. Use a flashlight to peer through any gaps in the drywall or at the junction of drywall and baseboard.
Seal openings. Apply steel wool or copper mesh to small cracks, then cover with expanding polyurethane foam or cement‑based mortar. For larger gaps, install metal flashing or hardware cloth secured with screws. Ensure all vents, pipe sleeves, and cable entries are fitted with tight, rodent‑proof collars.
Deploy traps. Place snap traps or electronic kill traps directly against the drywall where activity is observed. Bait with high‑fat foods such as peanut butter or bacon. Position traps at least 12 inches from walls to prevent mice from avoiding contact. Replace traps regularly until captures cease.
Consider bait stations. If infestation is extensive, use tamper‑resistant bait stations containing anticoagulant or bromethalin pellets. Follow label instructions for placement, spacing, and disposal.
Apply repellents cautiously. Rodent‑repellent sprays containing peppermint oil or ultrasonic devices may deter activity but should not replace physical barriers and trapping.
After removal, clean the area. Vacuum droppings and nesting material, then disinfect with a solution of 1 part bleach to 10 parts water. Allow surfaces to dry completely before repairing drywall.
Repair damaged drywall. Cut out compromised sections, replace with new gypsum board, and seal seams with rodent‑resistant tape and joint compound.
Implement preventive maintenance. Trim vegetation away from the foundation, keep debris cleared from the perimeter, and inspect the exterior annually for new entry points.
Follow local regulations regarding rodent control products and disposal of dead rodents. Consistent application of these steps eliminates the hidden infestation and reduces the risk of recurrence.