Quick Answer
Drywood termite frass can form small piles of hard, fairly uniform pellets below tiny openings in wood. A pile that returns in the same spot is more meaningful, but it cannot prove species, current activity, or the extent of hidden damage.
Evidence strength
Moderate clue
Stronger when uniform pellets repeatedly appear directly below a small opening in intact wood.
- The pellet pile and the wood above it should be documented together.
- Recurrence after cleanup is more informative than an undated pile.
- Visible insects, wings, galleries, or verified wood damage are corroborating evidence.
What it may indicate
- Material expelled from a drywood termite gallery in trim, furniture, framing, or other wood.
- A localized opening above the pile that deserves a wood inspection.
Other explanations
- Ordinary sawdust from drilling, sanding, movement, or repair work.
- Carpenter-ant debris, powderpost-beetle powder, seeds, grit, or deteriorating wood.
What this evidence cannot prove
- That termites are currently active from one old pile.
- The termite species or size of an infestation.
- Whether structural wood is safe.
Where to check next
- Inspect the wood directly above the pile for small openings, cracks, loose wings, insects, or altered surfaces.
- Check adjacent trim, furniture, attic timbers, and window or door frames without opening structural wood yourself.
Additional evidence to collect
- Macro photo of several pellets beside a ruler.
- Wide photo linking the pile to the wood and exact opening above.
- A dated note showing whether the pile returns after careful cleanup.
Protect the evidence and the structure
Avoid sealing holes or applying pesticide before the source is understood.
- Save a small sample in a closed container if it can be collected safely.
- Arrange a licensed inspection when pellets recur, insects are present, or structural wood may be involved.
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Last reviewed August 2026. This content supports evidence interpretation and does not replace medical diagnosis, structural inspection, product labels, or local rules.