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Carpenter Ant

Pro Recommended
Carpenter Ant

Identification

Large black or red-and-black ants, 1/4 to 1/2 inch long, that excavate smooth tunnels in damp or decaying wood to build nests. Unlike termites, they don't eat wood — they push out small piles of sawdust-like debris (frass) near entry points. Winged reproductives ('swarmers') emerging indoors in spring are a strong sign of an established nest.

Can I DIY this?

Pro Recommended

Honest advice: most people should call a pro.

This pest is notoriously hard to eliminate with store-bought treatments alone, and failed attempts usually make the problem worse. DIY can knock down light activity, but for anything established we recommend a professional.

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Recommended products

Taurus SC Termiticide/Insecticide, 20 ozNon-repellent perimeter treatmentControl Solutions D-Fense Dust Insecticide, 1lbDust cracks, crevices & voids

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  1. Confirm carpenter ants (not termites) — look for smooth, clean tunnels and small piles of sawdust-like debris (frass) pushed out near the nest, since carpenter ants excavate wood but don't eat it.
  2. Find and fix the moisture problem — a leak, poor grading, or damaged siding is almost always what let them get started in the first place. Without fixing this, the ants will likely come back.
  3. Locate the nest if possible (follow foraging trails, listen for faint rustling in walls) and treat the void directly with an insecticide dust for the most reliable knockdown.
  4. Apply a non-repellent liquid or aerosol along baseboards, entry points, and foraging trails so it gets carried back to any satellite nests.
  5. Set out protein and sugar bait near trails to catch foragers you haven't traced back yet.
  6. Treat the exterior perimeter, especially around woodpiles, stumps, and any wood-to-soil contact near the structure.
  7. Recheck in a few weeks — if frass or activity continues, the nest wasn't fully treated or the moisture issue hasn't been resolved.

Wear long pants, a long-sleeved shirt, closed-toe shoes with socks, chemical-resistant gloves, and goggles. Add a respirator if the label calls for it or ventilation is poor.