Carpenter ant nests contain both parent and satellite colonies, and all colony sites must be removed to completely control the infestation. Effective control methods include using chemical treatments, removing decayed wood and eliminating moisture.
Bait with a slow-acting poison, such as boric acid, to control indoor carpenter ants when the nests can't be found or are in areas where they can't be removed. For outdoor nests, apply insecticide directly to the nest, and treat the exterior of the building with residual insecticide. Remove damp or rotting wood to prevent future colonization, and prune overhanging branches to eliminate carpenter ant access to structures.