Spiders, both benign and poisonous varieties, are natural predators and keep your garden and yard clear of more damaging pests. Though spiders are good for the environment, you might not want them lurking in your garage. Cultural controls may mean a bit of extra work for your family, but they can keep spiders outdoors where they belong and your garage free of these creepy crawly arachnids.
Install a rubber door seal on the bottom of your garage door. Sometimes called a storm threshold, this inexpensive product is available at home improvement stores. It keeps light, cold air, water and insects out of your garage. Kits include an easy-to-use adhesive.
Clean up your garage. If you use this space as a storage facility, you are unwittingly inviting spiders to make themselves at home. Cardboard boxes filled with books and papers create debris that attracts spiders. Clear away leaves and grass cuttings as well.
Keep up with yard work to spider-proof your garage. Allowing long grass to grow around the perimeter or stacking up firewood against the building makes it easy for spiders to crawl right into the garage. Trim grass with clippers or a mower so it does not touch the building; stack firewood away from the structure.
Seal cracks in the garage floor, walls and foundation. A space as small as 1/16th of an inch is enough room for spiders to squeeze into the garage. Use caulking or cement patching kits to repair cracks and holes.
Spray the interior with a pesticide to get rid of spiders already living in your garage and to prevent future infestations. Make sure all pets and children are far away from the garage before spraying. Always follow directions on the pesticide's can.