Carpenter Ants vs. Termites: Which Damage Do You Have?

Read the wood

The damage pattern is the clearest tell:

• Carpenter ants: clean, sanded-smooth galleries, with coarse sawdust-like frass (and insect parts) pushed out of slit openings.
• Termites: tunnels packed with mud and soil, often hidden, with a thin layer of wood left on the surface.
• Carpenter ants nest in wood but do not eat it; termites eat the cellulose itself.

Read the insect

If you see the insects or their swarmers, the body tells you which: carpenter ants have a pinched waist, bent (elbowed) antennae and two pairs of unequal wings; termite swarmers have a straight, thick waist, straight antennae and two pairs of equal-length wings. In spring, both can swarm indoors near windows, which is when homeowners most often confuse them.

What each means for your home

Carpenter ants usually point to a moisture problem — they prefer wood softened by a leak, poor flashing or condensation — so the fix pairs colony treatment with drying out the wood. Termites are a structural concern that works silently from the soil up, so active termites call for a prompt inspection and a treatment barrier or bait system.

In older Lockport and Joliet homes, damp sills and trim invite carpenter ants, while subterranean termites remain a steady risk across northern Illinois.