What can be placed under a house to deter mice? - briefly
Install a sealed metal or concrete barrier around the foundation and lay a layer of steel wool or copper mesh in any gaps, then apply a rodent‑repellent granule or ultrasonic deterrent device beneath the structure.
What can be placed under a house to deter mice? - in detail
Mice gain entry to the crawl space through gaps, vents, and utility openings. Sealing these access points with hard, non‑chewable materials is the most reliable preventive measure. Install stainless‑steel mesh (¼‑inch gauge) or galvanized hardware cloth around all openings, fastening it with stainless‑steel screws to prevent rust. For larger gaps, use rigid foam insulation boards trimmed to fit, then cover the board with the same mesh for added protection.
A continuous rodent‑proof barrier along the perimeter of the foundation further reduces intrusion. Apply a thin layer of epoxy‑based sealant to the exterior footings, then attach a strip of metal flashing that extends at least six inches up the wall and five inches under the sill plate. This creates a physical hurdle that mice cannot gnaw through.
Chemical deterrents can complement physical barriers. Distribute granular rodent repellents containing capsaicin or p‑cymene evenly across the crawl space floor. Reapply according to manufacturer guidelines, typically every three months, and avoid excess that could attract other wildlife.
Trapping devices positioned near known activity zones provide immediate control. Place snap traps or electronic kill traps along walls, spacing them 12–18 inches apart. Bait with high‑protein items such as peanut butter or dried fish, and check traps daily. Replace captured devices promptly to maintain pressure on the population.
Moisture management diminishes attractants. Install a vapor barrier—heavy‑duty polyethylene sheeting—directly on the soil surface, overlapping seams by 12 inches and sealing edges with waterproof tape. Couple the barrier with a dehumidifier rated for crawl‑space use, maintaining relative humidity below 50 %. Reduced moisture discourages nesting and food sources.
Regular inspection sustains effectiveness. Conduct a quarterly walk‑through, looking for new gaps, damaged mesh, or signs of gnawing. Repair any deficiencies immediately, using the same stainless‑steel materials to ensure consistency.
By combining sturdy metal screening, perimeter flashing, repellents, strategic trapping, moisture control, and systematic inspection, the space beneath a residence can be rendered inhospitable to mice.