Signs of a Termite Infestation: What Every Homeowner Should Know
H&H Pest Control & Waterproofing — Serving NC Since 1974
Termites are often called "silent destroyers" — and with good reason. They can consume wood inside your walls, floors, and foundation for years before any visible signs appear on the surface. By the time most homeowners notice a problem, significant structural damage has already occurred.
In Cleveland County and the surrounding western NC region, subterranean termites are the predominant species. These colonies live underground and build mud tube tunnels up to wood food sources. A single mature colony can contain over a million workers, consuming 1 pound of wood per day. Over years, that adds up to devastating structural damage.
At H&H Pest Control, our termite inspection service is free for residential properties throughout the region. This guide will help you recognize the warning signs so you know when to call us.
Understanding Subterranean Termites
Before discussing signs, it helps to understand what you're looking for. Subterranean termite colonies have three castes:
- Workers — creamy white, soft-bodied, blind, 1/8 inch long. These are the ones consuming your wood, but you'll rarely see them outside the tunnel system.
- Soldiers — larger heads, mandibles. Defenders of the colony. Also rare to see in the open.
- Reproductives (swarmers/alates) — winged, dark-colored, 3/8 inch long. These are the termites homeowners most commonly see, but only during swarming events.
Most homeowners never see workers or soldiers. The colony's activity is almost entirely hidden from view — which is why knowing the indirect signs is critical.
Warning Sign #1: Mud Tubes
Mud tubes are the most reliable indicator of subterranean termite activity. Termites build these pencil-width tunnels from soil, wood particles, and saliva to maintain the humidity they need to survive while traveling between their underground colony and above-ground food sources.
Where to look:
- Along the outside of your foundation
- On foundation walls inside the crawl space
- On piers, support posts, and pipes in the crawl space
- Along the inside of basement walls
- Behind stored items in garages or outbuildings
Mud tubes range from pencil-width to finger-width. Active tubes will contain live termites when broken open. Abandoned tubes (from old or treated infestations) are hollow and may crumble. Either finding warrants a professional inspection.
Don't break mud tubes assuming that will solve the problem. The colony that built them is still active below ground and will rebuild the tubes within days.
Warning Sign #2: Damaged or Hollow-Sounding Wood
Termites consume wood from the inside out, leaving a thin veneer of wood or paint on the surface while hollowing out the interior. Tapping on affected wood produces a hollow, papery sound compared to the solid thud of sound wood.
Probe suspicious areas with a screwdriver or ice pick. Sound wood resists penetration; termite-damaged wood is soft, spongy, and allows the probe to sink in easily. You may also find a honeycombed pattern inside damaged wood, with galleries running parallel to the wood grain (subterranean termites typically avoid the harder annual rings).
Common locations for termite wood damage:
- Window sills and door frames
- Floor joists and sill plates in the crawl space
- Wood near plumbing penetrations (termites seek moisture)
- Wooden porch posts
- Garage door frames
Warning Sign #3: Swarmers (Alates)
Termite swarmers are reproductive termites that leave the colony to mate and establish new colonies. In North Carolina, swarming typically occurs in spring (March through May) on warm days following rain, though it can happen at other times of year.
Swarmers are often mistaken for flying ants. Key differences:
| Feature | Termite Swarmers | Flying Ants |
|---|---|---|
| Wings | Equal length, twice body length | Front wings larger than rear |
| Body | Straight, no waist | Pinched waist |
| Antennae | Straight, bead-like | Elbowed |
| Color | Dark brown to black | Variable |
If you find swarmers — or their discarded wings — inside your home, you have an established colony nearby. Swarmers found outside near your foundation are an indicator of soil-level colony activity.
We address how to distinguish between termites and carpenter ants in detail in our comparison article.
Warning Sign #4: Paint Bubbling or Blistering
Termites produce moisture as they work, and that moisture can cause paint to bubble or blister in a pattern that resembles water damage. If you see bubbling paint in an area without any obvious water source — no roof leak, no plumbing leak — consider termite activity in your list of possibilities.
This symptom is most commonly seen on wooden siding, door frames, and window frames on the first floor.
Warning Sign #5: Frass (Drywood Termite Droppings)
While subterranean termites are the primary species in Cleveland County, drywood termites occasionally establish in NC as well. Their calling card is frass — small, pellet-shaped droppings that accumulate below exit holes in wood. The pellets are 1/25 inch, uniform in size, with a hexagonal cross-section.
If you find small piles of what looks like sawdust or coffee grounds near woodwork, with no visible insect activity, it may be drywood termite frass. (Note: carpenter ant frass looks similar but is more varied and often includes insect parts.)
Warning Sign #6: Tight-Fitting Doors and Windows
As termites consume wood and produce moisture, affected door and window frames can warp. If doors or windows that previously opened and closed smoothly begin sticking or fitting too tightly, check the frames carefully for other signs of termite activity.
This symptom is nonspecific — it can also be caused by seasonal wood expansion, humidity changes, or foundation settlement — but in combination with other signs, it points toward termite damage.
Where to Inspect Your Home
A thorough termite inspection covers:
- Crawl space — the highest-risk area; look at all wood-to-soil contacts, sill plates, and floor joists
- Foundation perimeter — both inside and outside the foundation walls
- Plumbing penetrations — termites follow moisture; anywhere pipes enter the foundation is a vulnerability
- Garage — door frames, interior walls, any wood stacked on the ground
- Exterior wood — wood siding, decorative timbers, window and door frames
- Interior — baseboards, window sills, floor around plumbing fixtures
What to Do If You Find Signs
Don't panic, but don't wait. Termite infestations don't resolve themselves. A colony left untreated will grow and cause increasing damage over time.
Call a licensed pest control professional. Over-the-counter termite products are inadequate for established infestations. Effective treatment requires locating the colony and ensuring the treatment reaches the queen.
H&H's termite treatment options include liquid barrier treatments and Sentricon bait systems. Our termite prevention programs provide ongoing annual protection to detect and address new activity before damage occurs.
The Case for Annual Termite Inspections
The best time to discover a termite infestation is before it becomes serious. Annual professional inspections allow us to catch early-stage activity — mud tubes on a foundation wall, a small area of damaged wood — before it becomes a major structural problem.
For homeowners in Shelby and throughout our service area, H&H offers free termite inspections. We recommend annual inspections for all homes in our region, particularly those with crawl spaces, wood-to-soil contacts, or previous termite history.
Call H&H at (704) 482-2847 or use our online contact form to schedule your free termite inspection today.