Maintenance Guides / Pest & Wildlife

Seal entry points for mice and rats

Difficulty: moderateTime: 120 minsEst. Cost: $50 - $300

Why it matters

Cold-weather rodent push: gaps >1/4 inch allow entry. Infestations are expensive to eliminate and create health and fire hazards.

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How to do it

  • 1

    Walk the entire perimeter of your home's foundation in daylight.

  • 2

    Look for cracks, gaps, and holes in the foundation, sill plate, and rim joist.

  • 3

    Check around pipes, vents, cable entries, and utility penetrations.

  • 4

    Use a flashlight to see gaps clearly; any opening >1/4 inch is a potential entry point.

  • 5

    Apply weatherstripping tape to small gaps under doors and windows.

  • 6

    Use caulk for gaps 1/4 to 1/2 inch wide, and expanding foam for larger openings.

  • 7

    For gaps too large for caulk, install 1/4-inch hardware cloth first, then caulk or foam over it.