Termite Damage Signs Every DFW Homeowner Should Know

1. Mud tubes on foundation walls

Mud tubes are the single most reliable indicator of active subterranean termite activity. Subterranean termites can't tolerate open air without drying out, so they build covered tunnels of soil, saliva, and wood pulp to travel between their underground colony and the wood they're feeding on. The tubes are typically pencil-thin (¼ to ½ inch wide), tan to dark brown, and run vertically up foundation walls, slab edges, pier-and-beam posts, or interior walls in the garage.

When inspecting, focus on the slab perimeter — both inside the garage and around the exterior at ground level. In pier-and-beam homes (more common in older Dallas neighborhoods like Lakewood or Highland Park), check the foundation walls in the crawlspace. Tubes are easiest to spot in the spring after winter humidity has softened any old paint or sealant on the foundation.

If you find a mud tube, break a small section off. If the tube is rebuilt within 24–48 hours, you have an active colony. If it stays broken, the colony may have abandoned that route but could still be active elsewhere — get a full inspection regardless.

2. Discarded wings near windows and doors

Termite swarms in DFW peak in March and April, typically on warm afternoons after a spring rain. A mature colony produces winged reproductives (called alates) that fly out, mate, shed their wings, and start new colonies. The flight itself lasts only minutes, but the discarded wings — small, equal-sized, semi-transparent — accumulate on window sills, in spider webs, near exterior light fixtures, and on garage floors.

If you find piles of small wings (each about ¼ to ½ inch long) inside the home in spring, you have either an active interior colony that just swarmed, or wings blown in from a swarm next door. Either way, an inspection is warranted. The wings won't tell you which it is, but their presence inside means termite reproductives entered the structure at some point.

Discarded ant wings look superficially similar but ant wings are uneven (front pair larger than rear), while termite wings are all the same size. That distinction is the fastest field check.

3. Hollow-sounding wood

Subterranean termites eat wood from the inside out, leaving a thin outer veneer intact while consuming the structural cellulose underneath. The result is wood that looks normal on the surface but sounds hollow when tapped with a screwdriver handle, wrench, or even a knuckle.

The areas most worth checking in DFW homes: door frames (especially the bottom 12 inches), window sills, baseboards on exterior walls, the bottom plate of any wood-framed wall that meets the slab, and any wood in contact with soil or mulch outside (deck supports, fence rails near the house, raised garden bed framing within 6 feet of the foundation).

Comparing the sound of tapping known-solid wood (an interior door frame on an upstairs wall, for example) against suspect areas makes the difference obvious. Hollow wood combined with any of the other signs on this list is high-confidence termite damage.

4. Sagging floors or buckling baseboards near plumbing

Termites need moisture, and the wettest spots in most DFW slab homes are around plumbing penetrations — under bathroom vanities, behind kitchen sinks, around water heater enclosures, and in laundry rooms. Slow plumbing leaks create the wood-moisture conditions termites love, and infestations often start in these locations before spreading.

Visible signs: subfloor that flexes or sags when you walk over it, baseboards that buckle or pull away from the wall, vinyl flooring that bubbles, or hardwood planks that cup or sink. In bathrooms, check around the toilet flange and along the bathtub apron. In kitchens, pull out the bottom drawer below the sink and look at the cabinet floor for staining or soft spots.

Sagging floors and buckling trim can also indicate water damage alone, without termites — but the presence of either warrants getting both checked. Termite damage often piggy-backs on existing water damage and the two together accelerate.

5. Frass piles (drywood termites, less common in DFW)

Drywood termites are less common in North Texas than subterranean species — DFW's hot, dry summers don't favor them — but they show up in older homes with significant exposed wood. The signature sign is frass: small piles of six-sided wood pellets, each about the size of a grain of sand, accumulated below the wood they're feeding on.

Frass appears on window sills, in attic corners, on bookshelves with old framing, and near any drywood entry holes the colony has created. Unlike subterranean termites, drywood species don't build mud tubes and don't need contact with soil, so they can establish entirely within the structure of the home. They're slower-growing than subterranean species but harder to eradicate without spot or full structural treatment.

If you find frass piles, an inspection is essential to confirm species — the treatment for drywood termites is different from subterranean treatment.

6. Visible damage in attic, rafters, or sill plates

If termite activity has been going on for long enough, structural damage becomes visible without much hunting. Check the sill plate (the horizontal wood beam that sits on top of the foundation and supports the wall framing) for galleries — long, hollowed-out channels running with the grain of the wood. Check attic rafters where they meet the top plate of the exterior wall, especially in older homes with limited insulation.

Damage at this stage is often years deep. Repair costs can run into the tens of thousands, and structural integrity may be compromised. Any visible structural damage warrants both an immediate termite inspection and a structural assessment from a contractor or engineer.

What to do if you spot any of these

Any one of the six signs above warrants a professional termite inspection. The inspection itself confirms whether activity is current or old damage, identifies the species (subterranean vs. drywood), and produces a treatment plan if needed. Even if you can't act on the treatment immediately, the inspection report becomes a baseline you can compare against in subsequent years.

Treatment for subterranean termites typically involves either a liquid barrier (termiticide applied around the slab perimeter to create a continuous treated zone) or in-ground bait stations (sites that intercept foraging workers). Both approaches work; which is right for a given home depends on the foundation, soil, and landscape. The termite inspection page on this site routes the call to a local DFW provider that handles structural inspections and treatment programs.