Woodworm Holes – Active Infestation or Old Damage?

You’ve spotted small holes in your timber…

Maybe in floorboards, joists, or roof timbers.

And the question most homeowners in Liverpool ask is:

👉 “Is this active woodworm — or just old damage?”

It’s a crucial distinction — because not all woodworm needs treatment.

At Weather Wise Solutions — a family-run damp and timber specialist — we regularly inspect properties where timber shows signs of historic activity, but no current infestation.

🪵 What Woodworm Holes Actually Mean

Those small round holes you see are:

👉 Exit holes — where adult beetles have emerged from the timber.

This means:

The damage has already happened
The beetle has completed part of its lifecycle
The hole itself does not confirm active infestation

🔍 How to Tell If Woodworm Is Active

The key isn’t just the holes — it’s what’s happening around them.

1️⃣ Fresh Frass (Wood Dust)

Active infestations often produce:

Fine, dust-like powder (called frass)
Light, fresh-looking deposits near holes
Accumulation on surfaces below timber

👉 If the dust is fresh and loose, activity may be ongoing.

2️⃣ Clean, Sharp Holes

New exit holes tend to be:

Clean-edged
Light in colour
Clearly defined

Older holes usually appear:

Darkened
Worn
Blended into the timber surface

3️⃣ Seasonal Activity

Wood-boring beetles typically emerge in warmer months.

So activity is more likely if:

New dust appears in spring/summer
Holes seem to be increasing over time

4️⃣ Moisture Levels in Timber

This is a big one from a PCA perspective 👇

👉 Most wood-boring beetles require elevated moisture levels

If timber is:

Below ~16% WME → low risk
Above ~20% WME → increased risk of activity

👉 Moisture is often the root cause — not the beetle itself

🧠 Why Many Woodworm Cases Don’t Need Treatment

One of the most common mistakes we see is:

👉 Treating historic woodworm unnecessarily

In many Liverpool properties:

The infestation happened years ago
The timber has since dried out
No active lifecycle remains

In these cases:

✔ No chemical treatment is required
✔ Monitoring and moisture control is sufficient

⚠️ When Treatment IS Required

Treatment may be necessary if:

Active frass is present
Moisture levels are elevated
Structural timber is being affected
Ongoing lifecycle is confirmed

👉 The decision should always be based on evidence — not assumption

🔍 How We Assess Woodworm in Liverpool Homes

At Weather Wise Solutions, we take a diagnostic approach rather than treating by default.

Our inspections include:

Identifying beetle type (where possible)
Checking for active frass
Measuring timber moisture content
Assessing ventilation and environmental conditions
Evaluating structural impact

Our surveyors are CPD qualified in Dampness in Buildings, with several holding Level 3 qualifications in damp and timber inspection, ensuring accurate and responsible diagnosis.