What should be poured under the floor to deter mice? - briefly
Apply a rodent‑repellent sealant—silicone or polyurethane caulk mixed with a deterrent such as peppermint oil, copper sulfate, or a mild rodenticide—along the entire subfloor perimeter. This creates a continuous chemical and physical barrier that mice cannot cross.
What should be poured under the floor to deter mice? - in detail
Applying a liquid barrier beneath a floor is one of the most reliable methods to block mouse entry. The most effective options are:
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Poured concrete – a continuous slab of cement mortar creates a solid, impermeable base that eliminates gaps and cracks. Use a mix with a minimum compressive strength of 3000 psi; add a water‑reducing admixture to improve flow and reduce shrinkage. Finish the surface smooth to prevent mouse burrowing.
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Epoxy resin coating – a two‑part epoxy poured over the subfloor cures into a hard, seamless membrane. Choose a formulation with a high solids content (≥70 %) for maximum thickness. Epoxy adheres well to concrete, wood, or metal substrates and resists chewing.
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Polyurethane floor sealant – a poured‑in‑place polyurethane creates a flexible, waterproof layer that remains intact under slight movement. Select a product rated for floor applications and apply a minimum of 2 mm thickness.
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Silicone‑based sealant – a low‑viscosity silicone can be poured into seams and joints before the final floor covering is installed. It cures into a rubbery, non‑porous barrier that mice cannot penetrate.
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Rodent‑repellent polymer slurry – commercial products combine a polymer base with natural repellents (e.g., peppermint oil, capsaicin). The slurry is poured into crawl spaces, forming a thin film that is both a physical block and a chemical deterrent.
Implementation steps:
- Inspect and clean the area, removing debris, old caulking, and any existing mouse pathways.
- Seal macro‑cracks with hydraulic cement or expanding foam before pouring the main barrier.
- Mix the chosen material according to manufacturer specifications, ensuring consistent viscosity for even flow.
- Pour the liquid evenly, using a screed or roller to distribute it across the entire under‑floor surface.
- Allow the barrier to cure fully—concrete typically requires 24–48 hours, epoxy and polyurethane need 4–6 hours for tack‑free finish and 24 hours to reach full strength.
- Inspect for pinholes or voids after curing; fill any defects with the same material before installing the final flooring.
When applied correctly, a poured barrier eliminates the structural openings that mice exploit, providing long‑term protection without reliance on traps or poisons.