Carpenter ants are very common in areas that have a high water table. They seek out high moisture areas in and around structures. Though not always, when carpenter ants are found in a structure, they are there because of a moisture problem.
Carpenter ants usually nest either in damp wood or close to it. In attics near clogged gutters or areas that have been subject to water leaks. They may also be found in hollow areas such as hollow doors and curtain rods.
Wood found to be infested with Carpenter Ants often has been damaged by wood rot. Wood rot destroys the structural soundness of wood. These ants compound the problem by chewing into and nesting inside the wood.
Ants living in the wood smooth it out with their chewing mouthparts and then live within the galleries they create to take advantage of the high moisture content that they favor. Unlike termites, carpenter ants cannot digest the cellulose in wood and thus do not destroy the wood in the same way as termites.