Excluding House Mice

Scientific Name: Mus musculus

  1. Thoroughly inspect your home from top to bottom looking for gaps 1/4" or larger. Visit inspection training and click on the link on inspection techniques to go to a free online course on how to inspect or at least know how your pest controller should be inspecting.
  2. Make sure you don't have bats. If you do, visit bats to learn how to handle them.
  3. If you don't have bats, or other animals, seal all the holes and gaps 1/4" or larger.
    • Small cracks and crevices can be closed with quality caulk or low expanding foam. (Warning, foam will break down when exposed to sunlight and it can be gnawed through).
    • Larger gaps can be filled with copper mesh Xcluder, stainless-steel mesh and/or hardware cloth. Use a screwdriver to help wedge the material in the opening.
    • Holes 1 inch or larger should be filled with foam (if appropriate) and then covered with 1/4" hardware cloth, solid wood or aluminum flashing.
  4. Pay attention to the following areas: Pipe gap mouse entry. Photo by Stephen Vantassel
    • Sill-the area where the walls meet the foundation
    • Pipes-often gaps exist around pipes which enter the building. See image on right by Stephen Vantassel. Note the pen sticking in the crack. This is an example of a mouse highway!!
    • Electrical wires-never work around electrical wires. Contact the electric company first!!
    • Eaves-gaps occur at the soffit level. Remember, mice can climb!
    • Doors--be sure that the gap between a door and the floor is filled with stiff brush or other gap filling product.

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