7 Warning Signs You Have Termites in Your Texas Home

Every year, Texas homeowners spend an estimated $300 million repairing termite damage — the majority of it discovered during renovation, home sale inspection, or after floors begin to visibly sag. The frustrating reality is that subterranean termites are almost entirely invisible during active foraging. A mature colony can process structural wood for 3–5 years before damage becomes apparent to the untrained eye. But the signs are there if you know where to look — and catching them early is the difference between a $500 treatment and a $50,000 structural repair.

What Do Termite Mud Tubes Look Like on Foundations and Piers?

Subterranean termites — responsible for approximately 95% of Texas termite damage — cannot be exposed to open air. They build pencil-width mud tubes from soil to wood, providing a protected travel path. Find these on foundation walls, support piers, the inside of crawl space block walls, and interior plumbing chases. Scratch open a tube: if pale-bodied workers pour out, the colony is actively using it. If empty, the tube is abandoned but indicates past or ongoing activity nearby.

Why Does Termite-Damaged Wood Sound Hollow When You Tap It?

Termites consume wood from the inside out, following grain lines and eating the softer springwood while leaving the denser summerwood until last. Tap wooden door frames, baseboards, floor joists, and structural members with the handle of a screwdriver. Sound wood returns a solid thud; termite-damaged wood sounds hollow, papery, or produces a dull thud at the damaged section. A screwdriver tip pressed firmly into damaged wood will often break through the surface into a hollow gallery.

Why Do You Find Discarded Termite Wings Near Windows and Door Sills?

Termite swarmers — reproductive alates — emerge from established colonies annually to found new colonies. After their brief flight (typically on warm afternoons following spring rain), they shed their wings at landing sites. Finding small, translucent wings in window sills, doorways, or spider webs inside your home is a strong indicator of an active nearby colony. Note: termite wings are equal in length; flying ant wings (a common confusion) are unequal.

Why Does Termite Activity Cause Blistering or Bubbling Paint?

Termite activity in wall cavities produces moisture from the breakdown of cellulose and from the tunneling colony's humidity requirements. This moisture migrates through plaster and drywall, causing paint to blister, bubble, or take on a water-damaged appearance without any obvious water source. Check exterior wood trim, window frames, and door surrounds annually for this sign — particularly on south- and west-facing surfaces in older Texas homes.

What Is Termite Frass and Where Do You Find It?

Drywood termites — common in coastal Texas from Galveston to Corpus Christi and in older construction throughout the state — push their fecal pellets (frass) out of kick-out holes as they feed. Drywood frass looks like fine sawdust or coffee grounds, is hexagonal under magnification, and accumulates in small piles below infested wood. Subterranean termites incorporate their frass into mud tubes rather than pushing it out, so frass accumulation specifically suggests drywood termite activity.

Why Do Doors and Windows Become Tight-Fitting When Termites Are Present?

Termite activity produces moisture that causes wood to warp and swell. Doors and windows that were previously easy to operate but now stick, drag, or require force to close — without any obvious moisture source or recent weather event — can indicate termite activity in the surrounding frame. This sign is most relevant in wood-frame construction and around wooden door and window frame components.

When Do You Actually See Termites?

Most homeowners never see live termites in the normal course of events. Worker termites are pale, soft-bodied, and immediately retreat from light exposure. Disturbing a wood pile, fence post, or garden border adjacent to your foundation and seeing white ant-like insects fleeing rapidly back into the soil or wood almost certainly indicates a subterranean termite colony. Swarmers (winged reproductives) flying around interior or exterior lights in spring confirm active colony presence.

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