Carpenter ants are one of the most common household pests in the Midwest. Besides being a nuisance indoors, these ants damage wood by hollowing it out for nesting space. While carpenter ants do not eat wood, large colonies can be destructive.
Carpenter ants are most active at night. A mature carpenter ant colony may contain as many as l0,000 ants. Carpenter ants become active in the spring (March-April) and remain active through the fall. A carpenter ant colony consists of multiple nests. The main nest, or parent nest, is typically outdoors in rail road ties, wood piles, tree stumps, etc. The parent nest is also where their reproduction takes place. The satellite nests are the ones most encounter. These nests can be found in your home; wood around leaking chimney flashing, attics, skylights, bathtubs, windowsills, doorframes, porch supports, columns, soffits, wood siding and shingles, and flat roofs.