What to do if a rat has gnawed through a wall? - briefly
Seal the opening with steel wool and caulk, then place snap traps or bait stations to eliminate the rodent. After confirming removal, repair the wall and inspect the property for other entry points to prevent recurrence.
What to do if a rat has gnawed through a wall? - in detail
A rodent that has breached a wall creates structural damage, potential entry for pests, and possible exposure to insulation or wiring. Address the situation promptly to limit health risks and repair costs.
Immediate actions
- Confirm the breach by inspecting the hole and surrounding area.
- Seal the opening with steel wool or a metal mesh, then cover with heavy‑duty caulk or expanding foam to block further entry.
- Remove any visible droppings, urine stains, or nesting material using disposable gloves and a disinfectant solution.
- Ventilate the space to disperse odors and reduce airborne contaminants.
Repair procedure
- Cut away damaged drywall or plaster until sound material remains.
- Replace insulation that may be contaminated; discard any that shows signs of moisture or gnaw marks.
- Install a new layer of drywall, secure it with screws, and tape, mud, and sand the joints.
- Paint or finish the repaired section to match surrounding walls.
- Inspect nearby electrical wiring and plumbing for chew damage; replace any compromised sections.
Preventive measures
- Eliminate food sources: store grain, pet food, and garbage in sealed containers.
- Reduce clutter in attics, basements, and crawl spaces where rodents can hide.
- Install metal flashing or hardware cloth around vents, utility penetrations, and foundation gaps.
- Maintain a clean perimeter by trimming vegetation away from the building and removing debris.
- Set up snap traps or electronic deterrents in identified activity zones, monitoring them regularly.
When to involve professionals
- Damage extends to electrical or plumbing systems.
- Evidence of a large infestation or multiple entry points.
- Uncertainty about proper sealing materials or building code requirements.
Document the repair steps, retain receipts for materials, and schedule periodic inspections to verify that the barrier remains intact. Prompt, thorough action restores the wall’s integrity and reduces the likelihood of future rodent intrusion.