Carpenter ants and termites both go after the wood in your house, and both send out winged swarmers in spring. That's where the resemblance ends. They feed differently, damage wood differently and call for completely different treatment, so getting the ID right comes first.
Carpenter ants tunnel into damp wood to nest but don't eat it, and they push out coarse sawdust. Termites eat wood and leave mud, not sawdust. To tell the swarmers apart, look at the waist, antennae and wings: ants have a pinched waist, elbowed antennae and unequal wings, while termites have a straight body, straight antennae and four equal-length wings.
How Do You Tell a Carpenter Ant From a Termite?
Most people meet these insects as swarmers: winged reproductives that show up on a windowsill or around a light. Texas A&M AgriLife entomologist Michael Merchant gives three checks that work even after the wings have dropped off:
| Feature | Carpenter ant swarmer | Termite swarmer |
|---|---|---|
| Waist | Distinctly pinched between thorax and abdomen | Straight-sided, no waist |
| Antennae | Bend sharply in the middle (elbowed) | Straight and flexible |
| Wings | Front pair longer than the back pair | All four wings the same length |
Workers are easier. Carpenter ant workers are dark, active ants you can see out in the open. Clemson's Home & Garden Information Center puts the larger workers at about 1/4 to 5/8 inch long. Termite workers are pale, soft and almost never seen unless you break into the wood or mud they're hiding in.
What Their Damage Looks Like
Carpenter ants don't eat wood. Clemson says they tunnel into it to build nests, and they're primarily attracted to moist wood. The giveaway is a pile of coarse wood shavings outside a hole or crack, often with insect parts mixed in. Inside, their galleries are clean and smooth.
Termites do eat wood. Subterranean termites live in the soil and travel up into a house through mud tubes on foundation walls, piers and pipes. Their galleries are packed with mud and debris rather than swept clean, and there's no sawdust pile.
Clemson's survey of South Carolina recorded eight termite species in the state, with the eastern subterranean termite (Reticulitermes flavipes) and the southeastern subterranean termite among the most commonly encountered statewide. Those two can only be told apart under a microscope, which is one more reason a professional ID is worth it.
Signs to Look For
Carpenter ants:
- Coarse sawdust (frass) piled below a hole, crack or baseboard
- Large dark ants indoors, especially around damp areas like windows, bathrooms and porch framing
- Winged ants indoors in late spring or early summer, when Clemson says carpenter ant swarmers typically emerge
Termites:
- Mud tubes on the foundation, crawl space piers or pipes
- Piles of discarded, equal-length wings on sills and floors in spring
- Wood that sounds hollow or crumbles, bubbling paint or sagging floors
For a step-by-step walk-around, see how to check for termites yourself and 6 signs of termite activity around your home.
How to Prevent Both
Both insects are drawn to wood that's damp or touching the soil, so the prevention list overlaps:
- Fix moisture. Clemson's first carpenter ant recommendation is correcting excess moisture: leaks, clogged gutters, poor crawl space ventilation and rotting trim.
- Trim back branches. Remove limbs and other vegetation touching or close to the house.
- Seal utility openings. Seal where pipes and wires enter and close other cracks and crevices.
- Break wood-to-soil contact. Keep siding, trim and stored lumber off the ground.
- Move the woodpile. University of Illinois Extension recommends stacking firewood off the ground and at least 3 feet from the house, and the University of Kentucky warns that wood stacked against a home for long periods can lead to termite or carpenter ant problems. Our guide to storing firewood without bringing bugs inside covers the details.
When to Call a Professional
- You find mud tubes, or a pile of equal-length wings indoors
- Sawdust keeps reappearing in the same spot
- You see winged insects inside and can't tell which one you have
- Wood is soft, hollow or damaged anywhere in the structure
Texas A&M advises contacting a termite professional when termite swarmers turn up indoors, and saving a few specimens in alcohol so they can be identified. Termites and carpenter ants are treated very differently, so an accurate ID comes before any treatment. See our termite control and ant control services, or request a quote for Charleston, Columbia, Greenville/Spartanburg, the Raleigh area or Hampton Roads.
Key Takeaways
- Carpenter ants nest in wood; termites eat it. Sawdust points to ants, mud points to termites.
- Check the waist, antennae and wings to identify a swarmer, even one that's lost its wings.
- Moisture draws both, so fix leaks and keep wood off the soil.
- Keep firewood off the ground and away from the house.
- Get a professional ID before treating, since the two need different approaches.
Sources: J. M. Sargent, P. A. Zungoli and E. P. Benson, "Carpenter Ants" (HGIC 2406), Clemson Cooperative Extension; K. Hathorne, P. A. Zungoli and E. P. Benson, "Termites of South Carolina", Clemson Cooperative Extension; M. Merchant, "Swarming Insects Indoors", Texas A&M AgriLife Extension; K. Johnson, "Why are there bugs in my firewood?", University of Illinois Extension; L. Townsend, "Firewood Insects" (ENTFACT-626), University of Kentucky.
Frequently Asked Questions
Carpenter ants tunnel into damp wood to nest but don't eat it, so they leave coarse sawdust. Termites eat wood, leave mud-packed galleries and build mud tubes, with no sawdust pile.
Check three things: ants have a pinched waist, elbowed antennae and front wings longer than the back wings. Termites have a straight body, straight antennae and four wings of equal length.
Clemson Extension says carpenter ant swarmers typically emerge in late spring or early summer. Subterranean termite swarms are most common in spring.
A few ants or termite workers carried in on a log won't start an infestation. The risk is a woodpile kept on the ground or against the house, which can support a colony next to the structure, so stack firewood off the ground and at least 3 feet away.
Fix leaks and other moisture problems, keep wood from touching the soil, trim vegetation away from the house, seal openings where pipes and wires enter, and keep firewood off the ground and away from the foundation.
Get a positive identification first, because the two pests are treated very differently. If you find mud tubes, termite wings indoors or recurring sawdust, call a licensed professional for an inspection.
Photo credits: USGS Native Bee Inventory and Monitoring Lab, Public domain; NY State IPM Program at Cornell University, CC BY 2.0, via Wikimedia Commons.