What termite damage can look like

Field comparison: what is inside the exposed gallery?

Mississippi State identifies dried mud inside wood galleries as evidence consistent with subterranean termite damage, while noting that damage can remain after an earlier infestation. By comparison, carpenter-ant galleries are excavated nest spaces and may look smooth.

The visible fill and nearby insects matter more than calling all damaged wood “hollow.” Fine round exit holes and powder shift the comparison toward wood-boring beetles; firm pellets shift it toward drywood termite evidence. These are inspection clues, not a way to measure remaining structural strength.

Reference: Mississippi State Extension: Signs of Termite Infestation · University of Minnesota Extension: Carpenter Ants

Record the pattern without opening the structure

• Photograph the entire damaged piece and a close-up of the exposed area, including a size reference.
• Look nearby for shelter tubes, pellets, or shed wings, and record the exact location of each sign.
• Note moisture, leaks, or soft wood. Decay and other wood-boring insects can also weaken wood.

Damage has several possible causes

Water damage and rot can soften or discolor wood without termites.

Carpenter ants excavate nesting galleries; wood-boring beetles can leave holes and powder. A licensed inspector can compare these signs.

Make a damage map before assigning a cause

Identify each affected piece by room and position, such as the lower left corner of a window frame. Photograph the whole piece and the exposed pattern. Mark concealed areas as unexamined. A contractor’s discovery during a repair and a mark visible on paint are different observations; record how the damage came to light and who actually examined the wood.

Compare the evidence that accompanies a gallery

Ask whether the cavity contains soil-like material, distinct pellets, irregular chips, or loose powder. Photograph each separately without digging further. The accompanying evidence can be more informative than the word “hollow.” Keep insects found nearby in the record, but do not assume an ant walking across an old cavity created it. Several causes can affect the same piece of wood over time.

Activity and structural strength are different questions

A pest inspection asks what insect is involved and whether evidence suggests activity. A building assessment asks what support remains and what repair is needed. Neither answer can be read reliably from the apparent size of a surface opening. If the affected member supports a floor, roof, or connection, tell the inspector its role and arrange appropriate building expertise.

What a useful written report should resolve

Request a location-based description of findings, the basis for identification, and the areas that were not accessible. Ask which conclusions are confirmed and which need further examination. Save repair photographs alongside the pest report so the record explains what was removed or replaced. This helps prevent a later observer from treating every remaining mark as a newly discovered problem.