A carpenter ant infestation in your house is one of the most damaging pest problems a BC homeowner can face. Carpenter ants excavate wood to build nests, causing structural damage that accumulates silently for years before most homeowners notice. This guide covers the signs, damage, and prevention of carpenter ant infestations in BC homes.
Signs of a Carpenter Ant Infestation in Your House
Frass: Small piles of sawdust-like debris mixed with insect parts near baseboards, window frames, or structural beams. Frass is pushed out of galleries by carpenter ants and is one of the most reliable infestation signs.
Sounds: Faint rustling or crinkling sounds inside walls, especially at night when carpenter ants are most active.
Live ants: Large black ants (6-13mm) foraging in the kitchen, especially after dark. Seeing winged carpenter ants emerging from walls in spring is a serious warning sign of an established indoor nest.
Damaged wood: Wood that sounds hollow when tapped, or structural members that show signs of excavation when examined.
How Much Damage Can Carpenter Ants Do?
A mature carpenter ant colony of 3,000-5,000 workers actively excavating for years can cause significant structural damage to joists, beams, window frames, and decks. Unlike termites, the damage is concentrated in specific areas around the nest rather than spread throughout the structure. Read our detailed guide on how much damage carpenter ants can do.
Why Carpenter Ant Infestations Develop
Carpenter ants are strongly attracted to moist, softened wood for nesting. Common causes include: leaking pipes that saturate structural wood, roof leaks that damage rafters and sheathing, poor drainage that keeps the foundation and sill plates wet, and firewood stacked against the house. The parent nest is almost always in a moist wood source, with satellite nests extending into the structure.
Prevention
Fix all moisture sources immediately. Remove woodpiles, tree stumps, and dead branches from near the building. Trim tree branches touching the roofline. Seal gaps around pipes, windows, and utility penetrations. Have a professional inspect annually if you live in an area with high carpenter ant pressure.
Top Line Pest Control provides professional carpenter ant control across BC. Learn about our carpenter ant control services, read our guide on carpenter ant control in Surrey BC, or contact us today for a free assessment.