The black carpenter ant is a common invader of homes at the California. They normally nest in logs, stumps, and hollow trees. However, the large, dark-colored workers often invade homes.
Carpenter Ants don’t eat wood, but they sure like to make it their home. They bore into wood framing and even wood cabinets to make their nests.
They do cause structural damage but are usually noticed by home owners during swarming season when huge black flying ants are all over the place. They are about 3/4 of an inch in length…. These ants seldom tunnel into dry, sound wood, but they may excavate moist, rotting woods to make the nests. Rarely will the expansion of a nest into a building’s wooden timbers cause structural damage (section 1 category pest / Structural Pest Control).