Early detection and prompt professional treatment of woodworm infestations in
flooring are key to managing these pests effectively, says Nicholas Donnithorne.

WOODWORM, the larvae of wood-boring beetles that burrow into timber, can present a major issue for properties. Typically, most active in the months of April through to September (‘woodworm season’), these pests enjoy nothing more than chewing their way through large wooden features, such as floorboards, staircases, roof timbers, and joists – causing major damage to their structure over time.

Woodworm infestations can pose a particular challenge in wooden flooring (solid wood and laminate flooring can be affected, as well as any supporting timbers or boards).

In a recent survey of property preservation technicians and surveyors , 26% reported an increase in woodworm infestations since April this year, with 100% of those surveyed indicating that floorboards were the most common area where woodworm damage was detected.

Of particular note in recent years is the resurgence of Powderpost beetle infestations. Powderpost beetles can only infest the sapwood of wide-pored hardwoods such as oak. Oak laminate has become very popular and the top laminate may be backed by other fast grown wide pored woods.
These laminates will often originate in the Far East or Europe for solid green oak. The beetles have a one-year lifecycle so can quickly cause visible damage to the sapwood. Once all sapwood is consumed, the infestation will die out.

Signs of woodworm infestation
Woodworm larvae can remain hidden within wooden items for several years, causing extensive damage before any visible signs appear, so it’s important to remain vigilant to the early telltale signs of woodworm, including:
Tunnels in wood: Also known as galleries, these appear as a result of woodworm boring through the timber, weakening its structure.

Bore dust: Also known as frass, this fine dust is a byproduct of woodworm activity and is often found beneath infested floorboards. Its presence indicates an active infestation.

Crumbling wood: This is caused by multiple woodworm exit holes or larval tunnels and can be found around corners or edges of floorboards and joists.

Live adult beetles: Varying by species, adult beetles will generally emerge from timbers between April and September, when they will be looking to mate and start the entire lifecycle again. Like many insects, they are attracted to light and can often be found dead on windowsills.

Woodworm larvae: Woodworm larvae are usually a creamy-white colour and curved in shape, however, they are very rarely visible as they bore inside the wood they eat and live in.

Treatment options
Woodworm thrive in high moisture and the damper wood becomes, the easier it is for the larvae to chew through and live in it. Regular ventilation and moisture control in affected areas are crucial to mitigate the risk of infestation.

If detected, prompt action is essential to prevent costly structural damage. The first step should be to engage a professional to confirm the presence of woodworm, identify the species, and recommend the most effective treatment plan.

For more extensive infestations, commercial-grade treatments are recommended, including spraying; which can ensure the entire affected area is treated, and Controlled Atmosphere Technology (CAT) for items of furniture or of historic value; an advanced method using inert gases to eliminate all life stages of the beetle, ensuring thorough treatment without leaving harmful residues.

Preventive measures
Preventing woodworm infestations is key to preserving the integrity of your wooden flooring. Regular inspections, particularly in high-risk areas like basements, bathrooms or ground floors, can help identify early signs of infestation. Additionally, maintaining low moisture levels in timber and carefully checking any wooden items brought into your premises can minimise the risk of woodworm taking hold.

Woodworm infestations in properties are not just a nuisance; they can lead to significant structural damage and costly repairs if left untreated. Early detection and prompt professional treatment are key to managing these pests effectively.
www.petercox.com
Nicholas Donnithorne is FLS FRES, UK technical manager at Peter Cox