Ants are continually searching for food and water sources. They literally surround your home in nature living in a subterranean protected environment sending out soldiers and scouts to find food. Homes are often built on ant nests unknowingly and a queen can fly into a vent and nest under your home. But the most common way for a ant to get under your house is through a crack in the foundation.
Your only real line of defense is to spray the foundation with a product labeled to kill ants and for use on a house foundation.
Many of the spider barrier products can help in that ants will not want to cross that barrier. They sense the chemical and do not want to get infected and return that infection back to the nest. This is only partially effective though as I have witnessed over the past twenty years in the business. About ten percent of the ants will still try to get through. This means you need a powerful enough insecticide to kill that ant as he tries to enter.
Most home defense type products break down very quickly in full sun light. So you will have to re-spray a crack like this every few weeks to insure the chemical is active and will stop them.
Once under the house, baits really are the only option that will wipe out the colony. Granular baits will often have a label that will allow this. It depends on the house and what access is under the house but this is the way to stop ants.
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