Rodents exploit gaps under doors, so install chew-proof door seals to stop entry now.

Start by measuring the gap under your door accurately using a ruler and a rolled sheet of paper to see where light and air pass through. Choose a spring-loaded door sweep with stainless steel springs and a replaceable silicone or rubber seal because the spring keeps constant contact as the door moves and the soft lip still blocks drafts. For wider gaps, fit a heavy neoprene threshold seal that compresses against the door bottom; cut it to length with a utility knife and secure it with corrosion resistant screws, predrilling holes to avoid splitting the threshold. Add a metal kick plate at the base of exterior doors to protect softer materials from chewing, installing it so the lower edge overlaps the threshold seal by a quarter inch to prevent a new gap. Check the concrete perimeter outside for voids and trim back loose soil and vegetation to create a hard barrier that discourages burrowing; pour a small concrete apron or install compacted gravel and paving within six inches of the foundation to make tunneling more difficult. Finally inspect and maintain seal integrity twice a year and after extreme weather by flexing seals, replacing frayed silicone lips, and retorquing fasteners so small failures do not become entry points.

Homeowners often pick a soft sweep that rodents can gnaw through, so choose metal backed or reinforced seals instead and follow up with a kick plate. People sometimes forget that thresholds and adjacent concrete are part of the barrier, and rodents will tunnel if soil and debris create a gap, so harden and grade the perimeter to eliminate voids. Another common error is overreliance on a single product; combine a spring sweep, heavy neoprene threshold, and metal kick plate and inspect regularly so any single failure does not allow entry.

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