Woodworm in Your Garden Shed
Woodworm is the common name for the larvae of several species of wood-boring beetle, most commonly the Common Furniture Beetle (Anobium punctatum). The adult beetles lay eggs in cracks in timber, and the larvae bore into the wood, feeding on it for 2-5 years before emerging as adults through the characteristic small round exit holes..
- Area served
- Edinburgh, Lothians, Fife & Falkirk
Small round holes in your shed timber and fine powdery dust below? That's woodworm — the larvae of wood-boring beetles. Left untreated, they can significantly weaken your shed structure. Here's how to deal with them.
Understanding the Problem
Woodworm is the common name for the larvae of several species of wood-boring beetle, most commonly the Common Furniture Beetle (Anobium punctatum). The adult beetles lay eggs in cracks in timber, and the larvae bore into the wood, feeding on it for 2-5 years before emerging as adults through the characteristic small round exit holes.
Scotland's damp climate makes untreated softwood particularly vulnerable. The larvae prefer timber with a moisture content above 20% — which is common in unheated, poorly ventilated sheds during the wetter months.
The good news is that woodworm is treatable and preventable. Pressure-treated timber is virtually immune to wood-boring beetles, and existing infestations can be treated with proprietary insecticide products.
Common Causes
Untreated Softwood
Bare, untreated timber is the primary target for egg-laying beetles. The soft, damp surface provides ideal conditions for larvae.
High Moisture Content
Beetles prefer timber above 20% moisture content. Damp sheds with poor ventilation create perfect conditions.
Poor Ventilation
Stagnant air and trapped moisture keep timber damp enough to sustain woodworm throughout the year.
Existing Infested Timber
Second-hand timber or pallets used in shed construction can introduce woodworm to a previously clean structure.
Ground Contact
Timber touching damp ground absorbs moisture, creating localised high-moisture zones that attract beetles.
Age of Timber
Older, weathered timber with surface cracks provides more egg-laying sites than smooth, new timber.
Our Solutions
Chemical Treatment
We apply permethrin-based woodworm treatment to all affected timber. The insecticide penetrates the surface and kills larvae inside the wood.
Timber Replacement
Severely weakened timbers — those with extensive tunnelling visible when probed — must be replaced to maintain structural integrity.
Shed Repairs →Pressure Treated Timber
All our new sheds use pressure-treated timber that contains preservative throughout the cross-section, making it highly resistant to wood-boring beetles.
Pressure Treated Sheds →Improved Ventilation
Adding vents reduces moisture content in the timber, making it less attractive to beetles and inhibiting larval development.
Base Upgrade
Replacing a damp base with a concrete slab and treated bearers eliminates ground-level moisture that sustains infestations.
Shed Bases →Full Shed Replacement
For sheds with widespread, long-established infestations, replacement with a new pressure-treated shed is often more cost-effective.
Shed Replacement →Base & Foundation Guidance
Timber in contact with damp ground is the most vulnerable to woodworm. A concrete base eliminates this contact entirely, keeping floor timbers dry and resistant to beetle attack.
Even with a concrete base, ensure the bearers beneath the floor are pressure-treated. These are the timbers closest to ground level and most at risk if ventilation is inadequate.
Maintain a clear air gap between the base and the shed floor. This ventilation prevents moisture build-up that woodworm larvae need to thrive.
Frequently Asked Questions
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