Squirrels enter houses through many natural or created openings such as holes along the soffits where boards have rotted out, unscreened attic vents, uncapped chimneys, broken or open windows and doors, and electrical wire and utility pipe openings. Never knowingly tolerate a squirrel in your house. Preventive maintenance
is the best defense against unwelcome squirrels and other wildlife. Periodically
inspect for potential entrances and make necessary repairs. Make sure squirrels or other animals are out of the attic before sealing entrances because if you seal them in the attic, they can do even more damage trying to escape. Cover the insides of attic vents and similar openings with 1⁄2-inch hardware cloth; repair rotten
boards along soffits or behind eaves troughs; and replace broken windows,
cap chimneys and fill electrical-wire and utility-pipe openings.
Squirrelproof valuable trees by placing 2-foot wide metal bands around
them, 6 feet off the ground. Trim overhanging branches to prevent
access.
Protect valuable crops by building a fence of 1-inch mesh wire. The fence
should be at least 30 inches high and extend 6 inches below ground, with an
additional 6 inches bent outward at a 90-degree angle to discourage burrowing.
Set at least two electrified strands, one 2 to 6 inches above ground and the
other at fence height, off the fence about 3 inches.
Protect newly planted bulbs with 1-inch mesh poultry wire. Dig a trench
slightly deeper than the desired depth of planting and fit the poultry wire in
the bottom. Add dirt and plant the bulbs. Place another strip of poultry
wire over the plantings so that the bulbs are completely encased, and
finish covering with dirt.