How to Identify
– Large black ants (up to 1/2 inch) seen foraging at dusk or dawn around foundations.
– Frass (fine wood shavings) or rustling sounds inside wall voids and attic spaces.
– Trails of workers leading to tree cavities, stump rot, or roof eaves.
– Satellite forager activity indoors near windows, doors, and damp baseboards.
Habitat
Moist or decayed wood in wall voids, roof eaves, window frames, and hollow doors; satellite colonies often located in dry structural wood adjacent to a moisture-damaged parent colony outdoors.
Health Risks
Do not sting but can bite; excavate galleries in structural wood, weakening beams and framing over time — less rapid than termites but cumulative damage can be significant.
Carpenter ants are not dangerous to people in Asheville but their excavation of wood can weaken structural members over time, especially in older mountain homes with existing rot.
Treatment
Locate and treat parent colony with residual dust or non-repellent liquid; address moisture source driving infestation; perimeter bait application for outdoor forager control.
Local control focuses on locating and treating the moist parent colony with targeted dusts or non-repellent liquids, perimeter baiting for foragers, and repairing the moisture source driving infestation.
Prevention Tips
– Eliminate moisture issues — repair roof leaks, condensation, and plumbing drips promptly.
– Trim tree branches and shrubs away from rooflines and siding.
– Store firewood off the ground and away from the house exterior.
– Seal exterior gaps, utility penetrations, and door/window frames with caulk.
– Replace any rotted or water-damaged wood before ants establish galleries.
– Repair roof leaks, clogged gutters, and attic condensation promptly — common causes in Asheville’s humid summers.
– Trim branches and vegetation at least 3–4 feet away from rooflines and siding to reduce bridge access.
– Store firewood and lumber off the ground and away from the house, especially in wooded lots.
– Replace or remove rotted trim, porch posts, and any water-damaged structural wood.
– Seal gaps around utility penetrations and window frames to limit indoor entry points.