Termite Signs in North Texas Homes

Termites are the reason pest inspections exist. Unlike ants or roaches, the damage accumulates out of sight, often for years, and by the time it is obvious it is structural rather than cosmetic. The good news is that the early signs are genuinely recognisable if you know what you are looking at.

What we have here

Subterranean termites are the dominant species across North Texas, and they behave in a specific way that determines every sign on this page. They live in the soil, not in the wood they eat. They need contact with soil moisture to survive, and they cannot tolerate open air.

That constraint is the key to everything. To reach the wood in your house, they have to build a protected path from the soil to the structure — and that path is the single most reliable sign of their presence.

The signs, in rough order of how strongly they indicate activity

Mud tubes

Pencil-width tubes of soil and saliva running up a foundation wall, a pier, or interior framing in a garage or crawlspace. This is the termite highway, and it exists because the insects cannot cross open air safely. A mud tube is close to definitive. Here is what they look like and what to do about one.

Swarmers and discarded wings

In spring, usually on the first warm day after rain, mature colonies release winged reproductives. They are poor fliers, they are drawn to light, and they shed their wings quickly — so what homeowners typically find is not the insects but a small pile of identical translucent wings on a windowsill or in a bathtub.

Swarmers indoors are significant: it generally indicates a mature colony, and one already in or under the structure. Swarmers are very commonly mistaken for flying ants, which is the single most consequential misidentification in North Texas.

Hollow-sounding or damaged wood

Subterranean termites eat wood along the grain and leave the outer surface intact, so damage is invisible until you tap it. Wood that sounds hollow, gives under moderate pressure, or feels papery is worth flagging. Baseboards, door frames, window sills and the bottom plate of walls are common places to notice it first.

Blistered or rippled paint

Paint that looks bubbled or uneven, particularly near the floor, can indicate moisture and activity behind the surface. It is also caused by ordinary water damage, so it is suggestive rather than conclusive.

Doors and windows that suddenly stick

Worth noting, but interpret carefully. In North Texas, seasonal slab movement from clay soil causes this constantly and harmlessly. It matters when it is sudden, localised, and accompanied by any of the signs above.

Why DFW homes are vulnerable

Two regional factors compound each other.

The first is soil. The Blackland Prairie clay underlying most of the metroplex shrinks substantially in drought and swells when it rains. Over years this movement works on a slab foundation, opening hairline separations at the perimeter, at expansion joints and around plumbing penetrations. Subterranean termites need only a very small gap to reach the structure, and these gaps are invisible from inside the house.

The second is construction. Slab-on-grade is the dominant foundation type across DFW suburbs, and a slab gives you no crawlspace — no void anyone can enter to look at the underside of the floor. Activity can be well established before anything shows at eye level.

This is why housing age matters so much locally. A 1980s Plano or Allen slab has been through four decades of shrink-swell cycling. A 2015 Frisco slab has not.

Conditions that make it worse

• Wood, mulch or firewood in direct contact with soil against the house
• Downspouts discharging at the foundation instead of away from it
• Irrigation heads that soak the perimeter on a schedule
• Dense shrubs planted tight against the wall, which hold moisture and hide the foundation from view
• Any plumbing leak, however slow, at or below slab level

What to do if you find something

Do not disturb it. This is genuinely important and counterintuitive. Breaking open a mud tube or spraying visible termites tells you nothing useful, destroys evidence an inspector needs, and can cause the colony to abandon that route and build another one somewhere you will not find.

Photograph it, note exactly where it is, and leave it alone. Treatment for subterranean termites is not a retail product — it involves either a soil treatment around the structure or a monitored bait system, and both need to be done properly to work.

When to get it inspected

Any mud tube, any swarmer indoors, any pile of shed wings, or any wood that sounds hollow warrants an inspection. So does buying a house — a termite inspection before purchase is inexpensive relative to what it can find. If your home is over about twenty years old and has never been inspected, that alone is reason enough.