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How to spider proof your home
Prevent spiders from entering your home through doors.
Make sure spiders can't get through any gaps in your exterior doors. Install door sweeps on all of your exterior doors; spiders can squeeze through an opening that is 1/16 " (mm) tall.

OPT: [+] Remove doors where spiders live that are not in good repair. When selecting a door sweep pattern, select one that is reinforced and a good size. [+] Use caulk to seal the outside edges of your doors, but use foam weather-stripping to line the bottom track of sliding glass doors. Stop spiders from gaining entry to your house through utility openings. [+] Put activated charcoal in the garage or basement during hot weather. If it is hot, fill about 2/3 full of the charcoal you'll be using. [+] Doors 1/16 "-inch (mm) plus 1/2 " Use strong-smelling floral scents. Place specific chemicals such as citrus, lavender, or baby's breath in all areas that you want to reduce potential pet dander and insect problems.
Use caulk to seal the outside edges of your doors, but use foam weather-stripping to line the bottom track of sliding glass doors. Stop spiders from gaining entry to your house through utility openings.