“White ants” is the common name for termites, and when they show up in a house, they can cause serious structural damage over time. The name is especially associated with Coptotermes formosanus, a subterranean species known in its native China as “jiā báiyǐ” or literally “house white ant.” Despite looking somewhat ant-like, termites are more closely related to cockroaches than to ants, and they feed on wood and other cellulose materials rather than food scraps.
White Ants vs. True Ants
If you’ve spotted small, pale insects in or around your home and you’re wondering whether they’re termites or ants, three quick features tell them apart. Termites have straight antennae, while ants have bent, elbowed antennae. Termites have a thick, broad waist with little visible narrowing between the body segments, while ants have that distinctive pinched waist. And when winged, termites have front and hind wings of equal length, roughly twice their body length. Ants have shorter wings overall, with the front pair noticeably longer than the back pair.
Color matters too. Worker termites (the ones doing the damage inside your walls) are pale, soft-bodied, and avoid light. If you break open infested wood and see small, creamy-white insects scattering, those are almost certainly termites. True ants tend to be darker, harder-bodied, and more willing to forage in the open.
Common Species in Homes
The species most likely to invade your house depends on where you live. Subterranean termites are the most widespread and destructive group. They build their colonies underground and travel through mud tubes to reach the wood in your home. The Formosan subterranean termite is the most aggressive of these. It was introduced to the southeastern United States likely in the 1950s and is notorious for its massive colonies and rapid rate of wood consumption.
Drywood termites are a different threat. They don’t need soil contact at all. Instead, they fly directly to exposed wood, bore in, and establish colonies entirely within the timber itself. Their colonies are smaller (a few thousand individuals compared to hundreds of thousands for subterranean species), and damage develops more slowly, sometimes taking years to become noticeable. Both types can coexist in the same region, so it’s possible to deal with more than one species at once.
Signs of an Infestation
Termites work hidden inside walls, under floors, and behind surfaces, so the evidence is often indirect. Here’s what to look for:
- Mud tubes on your foundation. These pencil-width tunnels made of soil and saliva run up foundation walls, support piers, or plumbing pipes. They’re the clearest sign of subterranean termites, providing a protected highway between their underground colony and the wood in your home. Check both the exterior foundation and inside your crawl space.
- Swarmers or discarded wings. Winged termites emerging from walls, ceilings, or floors indicate a mature colony living inside the structure. You may find live swarmers near windows or light sources, or just piles of shed wings on windowsills and floors.
- Pinholes in drywall or paneling. Small, BB-sized spots of dried mud on interior walls or ceilings are a telltale sign. Pest control professionals call these “pinholes,” and they mark spots where termites briefly broke through a surface and sealed it back up.
- Sunken or rippled surfaces. Narrow, winding lines or sunken areas in paint, wallpaper, or other wall coverings suggest termites are feeding just behind the surface.
- Swarm castles. Odd, dried-mud formations sprouting from walls or ceilings in late spring are structures built by Formosan termites as launching points for swarmers.
- Tiny six-sided pellets. Small, uniform, hexagonal droppings accumulating on a floor or countertop are a signature of drywood termites, which push their waste out of small holes in the wood.
- Structural sagging. A floor that feels spongy, a door frame that crumbles when touched, or a roof line that dips can all indicate long-term termite damage that has compromised load-bearing timber.
What Attracts White Ants to a House
Moisture is the single biggest factor. Subterranean termites need consistent moisture to survive, and any part of your home that stays damp becomes a target. Leaky roofs, dripping pipes, poorly sealed windows, and condensation in crawl spaces all create conditions termites thrive in. Areas around windows, roof eaves, decks, and porches are especially vulnerable because they’re exposed to rain and often lack adequate drainage.
Direct wood-to-soil contact is the other major invitation. When structural timber, fence posts, or deck supports sit directly on or in the ground, termites can move from the soil into the wood without building visible mud tubes. Stacks of firewood leaning against the house, old tree stumps near the foundation, and garden mulch piled up against exterior walls all create bridges that make it easy for a colony to find its way inside.
How They’re Treated
Professional termite treatment generally falls into two categories: liquid barriers and baiting systems. They work differently, and many pest control companies use a combination of both.
Liquid barrier treatments involve applying a termiticide to the soil under and around the building’s perimeter. Modern products are non-repellent, meaning termites can’t detect the chemical and walk right through it, picking up a lethal dose they then spread to nest mates. This requires drilling and injecting through concrete slabs, porches, and patios, so it’s an involved process. For homes with crawl spaces, the soil around foundation piers is treated as well.
Baiting systems take a different approach. Small stations containing cellulose laced with a slow-acting growth disruptor are installed in the ground around the home’s perimeter, typically 10 to 15 feet apart and about 1 to 2 feet from the foundation. Termites find the stations while foraging, feed on the bait, and carry it back to the colony. The active ingredient disrupts molting, so termites die within weeks when they try to shed their exoskeletons. The colony declines gradually as the bait circulates. Additional stations are often placed near woodpiles, stumps, moist spots, or areas with previous damage to increase the chance of interception. Some systems can also be mounted indoors directly over active mud tubes.
Neither approach works instantly. Baiting systems in particular rely on termites discovering the stations through their natural foraging, which can take weeks to months. Liquid barriers act faster on termites that pass through the treated zone but still depend on the chemical spreading through the colony over time.
Preventing White Ants From Getting In
Prevention starts with controlling moisture. Fix leaky roofs, windows, and plumbing. Make sure gutters direct water away from the foundation. Ventilate crawl spaces adequately, and don’t let sprinklers soak the soil right next to exterior walls. Paint or seal any exposed wood before it has a chance to absorb water.
Eliminate wood-to-soil contact wherever possible. Replace any rotted, water-damaged, or previously infested timber. Store firewood off the ground and well away from the house. Remove old tree stumps from the yard.
For new construction, several physical barrier options exist. Soil-applied termiticides are the most common, applied to the ground before a slab is poured or around piers in a crawl space. Stainless steel mesh, marketed under names like Termi-Mesh, is permitted in some states as an alternative to chemical treatment. The mesh has openings too small for termites to pass through and is installed at critical entry points during construction. Metal termite shields, once standard on older homes, are less common in modern building but can still help if installed correctly. They need to extend at least two inches out and two inches down at a 45-degree angle from the foundation wall, with all seams soldered shut to eliminate gaps.
On homes with hollow-block foundations, filling the blocks with concrete or capping support piers with solid concrete eliminates the internal voids termites use to travel upward undetected. A continuously poured concrete cap is the most effective option, though concrete-filled brick caps are more common and still force termites into visible paths where you can spot them during an inspection.
Annual inspections by a licensed pest professional remain the most reliable way to catch an infestation early, before damage becomes structural. Even homes with active barrier treatments benefit from regular monitoring, since no system is completely foolproof.