How to Inspect Wooden Furniture

This guide is a practical, step-by-step inspection method for checking any wooden piece — new, secondhand, or a piece you've owned for years — for wood borer activity, organized as a repeatable routine rather than a one-off list of things to look for.

The short answer: the inspection routine

Check every surface, not just the visible faces — undersides, backs, and joints are where activity most often starts and where a normal glance rarely lands. Look specifically for small round exit holes and fine, powdery frass, then use a stiff card or your finger to check whether any frass found is fresh (loose, easily disturbed) or old (settled, compacted). Do a hollow-sound test by tapping with a knuckle across joints, legs, and larger flat panels, listening for a papery, hollow tone that differs from the solid sound of undamaged wood. Complete this full routine — not just a quick visual scan of the top surface — for any piece you're evaluating, whether that's a new addition to the home or a periodic check of furniture already in use.

Step 1: Visual check of visible surfaces

Start with a straightforward look across the top, front, and sides of the piece under good lighting, checking for any small round holes (roughly 1-3mm) or powdery residue. This step alone often misses activity concentrated on unfinished undersides, but it's the reasonable starting point before moving to less obvious areas.

Step 2: Check undersides and backs specifically

Turn the piece over or reach underneath (carefully, for heavier items) to check the underside — this is frequently left unfinished during manufacturing and is where activity most commonly starts, precisely because it offers exposed wood pores a finished top surface doesn't. Check the back of cabinets and the underside of tabletops and chair seats specifically.

Step 3: Inspect joints and legs closely

Joints, where two pieces of wood meet, and legs are both common activity sites and structurally significant points where damage matters most. Check closely for holes, frass accumulation in the joint gap itself, or any visible weakening.

Step 4: Determine if frass is fresh or old

If frass is found, wipe it away completely and check the same spot again after a few days — fresh, ongoing activity will produce new powder in that time, while old, resolved activity won't. This step distinguishes an active infestation needing treatment from a past one that's already run its course.

Step 5: Hollow-sound test

Gently tap across joints, legs, and larger flat panels with a knuckle, listening for a hollow, papery sound distinctly different from the solid tone of undamaged wood — this can reveal internal tunnelling even where no exit holes are visible yet on the surface.

When to do this full inspection

• Before bringing any secondhand or antique furniture home, ideally before purchase or acceptance.
• Periodically for valuable or older pieces, particularly items in less-monitored storerooms.
• For any piece near a confirmed infestation, given that spread to nearby vulnerable wood is a genuine risk — see our guide on can wood borers spread.
• Whenever you notice unexplained fine powder near any wooden item, even if you're not certain of the source yet.

What to do based on what you find

No signs found: Reasonable confidence the piece is currently unaffected, though periodic rechecking remains a good habit for valuable or older items.

Old, dry frass with no fresh accumulation over a follow-up check: Likely a past, already-resolved infestation — worth monitoring but not necessarily requiring immediate treatment, though refinishing to seal exposed pores is still a reasonable precaution.

Fresh frass, active accumulation, or a positive hollow-sound test: Book a professional inspection and treatment rather than continued self-monitoring, given active, ongoing damage.

Common mistakes during inspection

• Only checking visible top and front surfaces, skipping undersides and backs where activity commonly starts.
• Not distinguishing fresh from old frass, missing whether treatment is actually needed.
• Skipping the hollow-sound test, missing internal damage where no exit holes are visible yet.
• Treating inspection as a one-time task rather than a periodic habit for valuable or older furniture.

Found something concerning during your inspection? iPest's wood borer treatment service in Bangalore can confirm and treat active infestations professionally. Book an inspection today.

Frequently asked questions

What tools do I need to inspect furniture for wood borers?

None beyond good lighting and your own hands — a flashlight helps for checking dark undersides, and a knuckle or small tool handle is sufficient for the hollow-sound test. No specialized equipment is needed for a basic DIY inspection.

How do I know if frass I found is fresh or old?

Wipe it away completely and check the same spot again after a few days — fresh, ongoing activity produces new powder in that window, while old, resolved activity doesn't.

Why do I need to check undersides specifically, not just visible surfaces?

Undersides are frequently left unfinished during manufacturing, offering exposed wood pores that a finished top surface doesn't — this makes them a common starting point for activity that a surface-only check would miss entirely.

How often should I inspect furniture I already own?

Periodically for valuable or older pieces, particularly those in less-monitored spaces like storerooms — there's no fixed universal interval, but building this into an occasional habit catches activity earlier than waiting for obvious signs.

What should I do if the hollow-sound test seems positive but I don't see any holes?

This can indicate internal tunnelling before any exit hole has formed on the surface yet — worth a professional inspection to confirm rather than waiting for a hole to eventually appear.

Should I inspect furniture before buying it secondhand, or after bringing it home?

Ideally before purchase or acceptance, so you can make an informed decision — but if that's not possible, inspect promptly after bringing it home and isolate it from other wooden furniture for a few weeks as a precaution.

This guide is part of iPest's complete resource on wood borer control in Bangalore. See signs of a wood borer infestation and can wood borers spread.