What woodworm is
Woodworm is a general term for the larvae of wood-boring beetles that feed on timber. These small insects live and grow inside the wood, leaving holes and tunnels behind as they move through it. Over time, this can weaken the timber and cause structural damage if not treated.
What causes woodworm
Woodworm infestations start when adult beetles lay eggs on the surface of timber. The eggs hatch into larvae that bore into the wood and feed on it. They stay hidden for several years before emerging as adult beetles to start the cycle again. Woodworm prefers timber with higher moisture content, so damp conditions make an infestation more likely.
Common types of wood-boring beetles
Several beetle species cause woodworm in UK homes. The most common is the Common Furniture Beetle, which attacks floorboards, joists, and furniture. The Deathwatch Beetle targets older hardwood timbers and is often found in historic buildings. The House Longhorn Beetle is rarer but can cause severe damage to roof timbers.
Signs of woodworm infestation
There are several signs that woodworm may be present. Small round holes on the surface of wood are the most obvious. You may also notice fine powder, known as frass, near the holes. Timber may feel weak or crumbly, and in severe cases, the surface may collapse under pressure. Adult beetles emerging from the wood are another clear sign that an infestation is active.
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Where woodworm is most often found
Woodworm can affect any timber, but it is most common in damp or. Lofts, poorly ventilated areas basements, and underfloor spaces are frequent problem spots. Old furniture, beams, and floorboards are also at risk.
Why damp increases the risk of woodworm
Beetles are drawn to wood with a higher moisture level because it is softer and easier for larvae to eat. Damp caused by condensation, leaks, or poor ventilation can make timber more vulnerable. Treating the damp problem is often part of the solution to stopping woodworm for good.
How professionals treat woodworm
Treatment begins with a survey to confirm the type of beetle and the extent of the damage. In most cases, a water-based insecticidal treatment is applied to affected timbers. This kills any active larvae and prevents new beetles from infesting the wood. Severely damaged wood may need replacing. The area is also checked for damp to make sure the conditions that attracted the beetles are removed.
Preventing future infestations
Keeping timber dry is the most effective way to prevent woodworm. Good ventilation, leak repairs, and damp proofing all help. Regular checks in lofts and under floors can spot problems early before serious damage occurs.
When to seek expert help
If you notice small holes, powdery dust, or weak timber, it is best to arrange a professional survey. An expert can confirm whether the infestation is active and recommend the right treatment.
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