Where Mice Enter Homes
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Mice In My House - Address Weep Holes First
Home owners spend a lot of time and money on traps and poison without realizing weep holes are the most common point of entry on brick homes. Manage these first to cut off this avenue of entry and then review the other possible entry points below.
Utility Wall Penetrations
Wherever you find a utility such as gas, hydro, ac or furance exhaust these pipes pentrate the wall and typically leave small gaps between the wall and the pipe, large enough for mice to squeeze into your living space. These should be stuffed with wire mesh and caulked shut. Be cautious not to allow the metal mesh to be in contact with a metal pipe nor wiring.
Where Soffit Meets Brick
Once you remove the ease of access via weep holes, mice may scale your wall in search of other entry points of which they will find soffit meeting brick and with 1/4 inch gaps or greater they are in like flint. Caulk this area to keep both mice and bats a-bay.
Where Soffit Meets Roof
Mice are more likely to get in via the lower entrypoints before venturing onto a roof. Getting up there presents more risky exposure to preditors. But trees and bushes touching the roof line do assist. These roof/soffit junctures are more ideal for roof rats, squirrels and raccoons due to flimsy building material.
Wood Piles And Other Debris
While not an entry point these features provide safe havens for nesting and protection from preditors, attracting them close to the home for more time to scrutinize all the possible entry points as the seasons change.
Chimneys And Roof Vents
If the access to your roof is direct via trees or bushes or structures built onto the house that touch the roof line such as a pergolla, mice may venture to these spots. The other risks here are roof rats, birds, squirrels and raccoons.
Poorly Closing Doors / Windows
Over the years structures can shift leaving gaps where doors close. If more than 1/4 inch you invite mice and rats to easily pass into your garage or living space.
Sided Homes have corner posts. These posts are open at the bottom allowing mice to easily climb inside and up to the attic. These posts are open at top and bottom to allow for airflow and constant expansion and contraction so use an exclusion method that still allows airflow.
Anything that is designed to provide airflow such as gable vents, to a sheltered space should not be sealed rather inspect these for gaps larger than 1/4 inch and ensure whatever you use to reduce the gaps continues to provide airflow and will not clog over time. Speak to your furnace and dryer service professionals before you do anything with vents designed to expell harmful exhaust or feed a furnace.