I cannot tell from the photo that this is damage from Carpenter ants, as I do not see any insects. Carpenter ants generally tunnel into moist, rotting wood to make their nests. So if you have carpenter ants invading your house, look for wood that had possibly gotten wet from leaky roofs or leaky pipes. If you have a number of carpenter ants in your home, then you may have a nest in some rotting wood. You will have to do some searching and try to find the nest, then destroy it. If you only have an occasional carpenter ant in the house, then I wouldn't worry too much. Carpenter ants generally make nests in dead trees, fence posts, or even firewood. If you are concerned that they are getting into your house, you could use a perimeter spray around the foundation of your house. Also keep firewood away from the house. Check out the following links for more information: http://ento.psu.edu/extension/factsheets/carpenter-ants http://ipm.ucanr.edu/PMG/PESTNOTES/pn7416.html I hope this was helpful. Feel free to contact us again if you have further questions.