How to get rid of mice in drywall walls? - briefly
Identify and seal every opening that allows entry into the wall cavity, then install snap traps or bait stations inside and monitor until no activity is detected. Clean the area thoroughly and, if desired, use ultrasonic deterrents to discourage future incursions.
How to get rid of mice in drywall walls? - in detail
Eliminating rodents that have taken refuge inside interior wall cavities requires a systematic approach. First, confirm the presence of activity by listening for scratching sounds, spotting droppings, or finding gnawed insulation. Once confirmed, follow these steps:
- Locate entry points. Inspect the exterior of the building for gaps around utility penetrations, vents, and foundation cracks. Inside, check for openings around pipes, wiring, and the top of the wall cavity where drywall meets the ceiling. Seal each opening with steel wool, copper mesh, or concrete, then cover with caulk or expanding foam for a durable barrier.
- Set up capture devices. Place snap traps or electronic kill traps directly in the cavity if access is possible through a small opening. For inaccessible areas, use bait stations with anticoagulant rodenticide, ensuring compliance with local regulations and safety for non‑target species.
- Apply repellents as a supplemental measure. Granular or liquid formulations containing peppermint oil, capsaicin, or ultrasonic emitters can discourage further intrusion, but they should not replace physical exclusion and trapping.
- Remove contaminated material. After successful capture, extract the mouse carcasses and any soiled insulation. Dispose of waste in sealed containers and disinfect the area with an appropriate rodent‑borne pathogen sanitizer.
- Repair and restore. Replace damaged drywall and insulation with new, pest‑resistant materials. Install metal flashing or hardware cloth around future penetration points to maintain a long‑term seal.
- Implement ongoing monitoring. Install motion‑activated cameras or periodic inspection schedules to detect any new activity promptly.
Consistent application of exclusion, trapping, sanitation, and repair eliminates the infestation and prevents recurrence.