Rodent Exclusion and Entry Point Sealing in Pikesville, MD

Trapping and treatment clear what is inside a home right now. Exclusion is the part of the job that keeps the next mouse or rat from simply replacing it, and it is the step most often skipped by a one-time treatment that only sets bait.

A mouse-sized gap is about a quarter inch, roughly the width of a pencil. A rat-sized gap is closer to half an inch, about the width of a thumb. Both sizes show up constantly on Baltimore County houses: cracked foundation vents, gaps where a dryer vent passes through siding, sill plate joints that settled and opened over decades.

• Stainless steel wool packed into small gaps rodents cannot chew through.
• Galvanized hardware cloth over vents, foundation gaps and larger openings.
• Sheet metal flashing at sill plate joints and utility penetrations.
• Mortar or cement patch on masonry gaps at the foundation.

A house rarely has just one entry point. The inspection that comes before sealing work checks the full foundation perimeter, every utility penetration, the garage door sweep, and the roofline, because sealing three gaps and missing a fourth means the problem comes right back.

Baltimore County gets a real winter, and that first hard frost is usually when rodent calls spike as mice and Norway rats push indoors looking for warmth. Sealing gaps before the cold sets in, in late summer or early fall, tends to pay off fastest, though the work holds value any time of year.