10/14/2026
Lets talk defense strategy, Mice can squeeze through any opening larger than 1/4 inch(roughly the size of a standard pencil). Effective prevention requires sealing entry points before fall temperatures drop.
Phase 1: Exterior Sealing (The Physical Barrier)
Inspect the Foundation & Mortar:
Pittsburgh Brick/Fieldstone Foundations: Older foundations in areas like South Side, Lawrenceville, or Squirrel Hill often develop gaps in the mortar lines over time. Mortar joints, coal chutes, and former window wells are common entryways.
Seal Gaps: Pack gaps with copper mesh or coarse steel wool, then cap with exterior-grade silicone caulk or Hydraulic mortar. Avoid expanding foam alone; mice will chew right through it.
Secure Mechanical Entries:
Utility Lines: Check where gas lines, AC coolant pipes, and electrical conduit enter the foundation. Seal gaps tightly around the pipe penetrations.
Vents & Drain Tile: Ensure foundation vents and dryer vents have 1/4-inch galvanized hardware cloth (wire mesh) covers.
Doors, Garages & Siding:
Door Sweeps: Replace worn rubber door sweeps on exterior doors and garage doors with metal-reinforced heavy-duty sweeps.
Corner Posts & Vinyl Siding: Check the bottom plastic corner posts of vinyl siding; Mice often use these hollow channels like tiny ladders to access upper walls. Plug open bottoms with wire mesh.
Phase 2: Interior Sanitation & Habitat Reduction
Food Storage: Store pantry staples, pet food, and wild bird seed in hard-plastic, glass, or metal containers with airtight seals.
Eliminate Water Sources: Fix leaking plumbing under sinks and drain floor traps in basements, as water attracts rodents as much as food does.
Yard Clearance: Keep firewood stacks, brush piles, and heavy vegetation at least 15–20 feet away from the foundation to eliminate cover near the house perimeter.
