Carpenter ants nest in moist wood out of doors but of more concern to the home owner is that they also nest in moist or decayed wood inside buildings. Wood decay caused by leaks, condensation, or poor air circulation can attract carpenter ants to nest in a home or other building. Commonly carpenter ants nest behind bathroom tiles; around tubs, sinks, showers, and dishwashers; under roofing, in attic beams, and under subfloor insulation; Carpenter ants may also nest in foam insulation.
and in hollow spaces such as doors, curtain rods, and wall voids.
A main carpenter ant colony will sometimes establish a satellite colony nearby. Satellite nest do not require moisture, so they may be found in dryer areas away from the main nest. In late summer, winged carpenter ants emerge from pupae and appear in structures in late winter and early spring as they swarm from a satellite nest.