A mouse is scratching behind the wall, what should I do? - briefly
Identify and seal any openings that allow access, then place snap traps or contact professional pest control. Inspect the wall cavity for droppings or damage and clean the area to reduce health risks.
A mouse is scratching behind the wall, what should I do? - in detail
A rodent is producing scratching noises within the cavity behind your wall. Immediate action prevents damage to wiring, insulation, and structural components.
First, locate the source. Listen for the strongest sound, then tap lightly on the wall to identify the exact spot. Use a flashlight through any accessible opening or cut a small inspection hole if necessary.
Next, eliminate entry points. Inspect the exterior for gaps around foundations, pipes, vents, and utility lines. Seal openings with steel wool, caulk, or expanding foam, then cover with metal flashing or hardware cloth for durability.
Choose a control method. Options include:
- Snap traps – place directly beside the identified activity zone, use peanut butter or dried fruit as bait.
- Live‑catch traps – set in the same area, release captured animals at least 5 km from the residence.
- Electronic traps – deliver a rapid voltage shock, positioned where the rodent travels.
- Bait stations – contain anticoagulant poison; restrict use to locations inaccessible to children or pets, and follow label instructions.
After placement, check traps daily. Dispose of dead rodents using sealed bags and disinfect the area with a bleach solution (1 part bleach to 9 parts water).
If the infestation persists, inspect interior spaces for nesting material, droppings, or gnaw marks. Clean all debris, vacuum crevices, and store food in sealed containers to remove attractants.
When structural damage is suspected—such as chewed wires, compromised insulation, or weakened studs—consult a licensed pest‑control professional and, if needed, an electrician or contractor to assess repairs.
Finally, implement preventive measures: maintain a tidy yard, trim vegetation away from the building, store firewood off the ground, and conduct quarterly inspections of the building envelope.
Following these steps eliminates the current problem and reduces the likelihood of future rodent activity behind the wall.