Sowbugs are flat, oval creatures. They are about three-eights of an inch long. Their body has several segments. They have 7 pair of legs and 2 pair of antennae. Another crustacean, the pillbug, resembles the sowbug.
A barrier pesticide treatment on the outside foundation can help discourage sowbugs and other pests that try to invade from the outside. The barrier will need to be re-applied periodically because of factors like weather. The local pest control professional can apply liquid or granular products, as the situation requires.