Texas ranks among the highest-risk states in the country for subterranean termite activity, and the North Houston area has the moisture levels and wood-to-soil contact that termites need to thrive. The frustrating thing about termites is that they work from the inside out, destroying structural wood while leaving the surface intact. By the time visible damage appears, colonies have often been active for years. Knowing the early warning signs is the only way to catch them before the repair bill gets serious.
Quick answer
The most reliable warning signs are mud tubes running along your foundation, discarded wings near windows or doors after a swarm, wood that sounds hollow when tapped, doors and windows that suddenly stick for no clear reason, and paint that bubbles or looks water-damaged without an actual leak. Any of these in a Texas home warrants a professional inspection.
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Mud Tubes Along the Foundation
Subterranean termites build mud tubes to travel between the soil and the wood they are eating. These tubes protect them from desiccation and predators, and they look like narrow pencil-width ridges of dried mud running along your foundation walls, piers, or any surface between the soil and your home's structure.
Check the exterior foundation perimeter, crawl space supports, and interior walls near the soil line. Breaking a tube open and coming back a day later tells you whether the colony is still active: if the tube is repaired, they are. If it stays open, the colony may have abandoned that tunnel, though that does not mean they are gone from the structure.
Discarded Wings After a Swarm
In spring, typically after a warm rain, subterranean termite colonies release winged reproductives called alates that swarm briefly before pairing off and starting new colonies. The swarm itself lasts only 30 to 60 minutes, and most homeowners miss it. What they find afterward is the evidence: small, equal-length wings piled near window sills, door frames, or light fixtures.
People often mistake termite swarmers for flying ants. The difference: termite wings are the same length, while ant wings are unequal (front pair larger than rear). Termites also have a straight waist and straight antennae, while ants have a pinched waist and elbowed antennae. Finding wings inside your home means swarmers were already indoors, which points to an active colony in the structure.
Hollow Wood, Sticking Doors, and Bubbling Paint
Tap along wooden baseboards, door frames, and windowsills. A solid thud is normal; a hollow or papery sound indicates termites have eaten the interior while leaving the surface shell. Window and door frames that suddenly stick or no longer fit squarely can indicate that termites have damaged the surrounding structural wood and caused slight shifts in the frame.
Paint that bubbles or looks water-damaged in a spot where there is no plumbing and no recent rain intrusion is worth investigating. Termites raise moisture levels in the wood they feed on, and that moisture can push paint off the surface from behind. It looks exactly like a water leak, but the source is the colony.
- Mud tubes on the foundation, piers, or exterior walls
- Discarded wings near windows, doors, and light sources after spring rains
- Wood that sounds hollow when tapped
- Doors or windows that suddenly bind without a moisture or paint reason
- Bubbling or blistering paint without an obvious water source
Why North Houston Homes Are Particularly Vulnerable
The clay soil common in this area holds moisture well, which is exactly what subterranean termite colonies need near the surface. Homes with pier-and-beam construction give termites easy access to wood that is close to or in contact with the soil. Even slab foundations have risks at points where wood framing meets concrete, around plumbing penetrations, and wherever landscaping mulch or wood debris touches the structure.
The Texas Forest Service and Texas A&M researchers have documented that Formosan termites, a more aggressive species than native subterranean termites, have spread significantly into the Houston metro. Formosan colonies can number in the millions and consume wood at a faster rate than native species, which makes early detection even more consequential.