[header] How to spider proof your home [title] Prevent spiders from entering your home through doors. [substeps] 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. 
Use caulk to seal the outside edges of your doors, but use foam weather-stripping to line the bottom track of sliding glass doors. [title] Stop spiders from gaining entry to your house through utility openings.