Dry Rot, Wet Rot & Woodworm Treatment in Bishop's Stortford

Where damp goes untreated, timber problems follow. Joist ends built into damp solid walls, floorboards over poorly ventilated subfloors, roof timbers under failed felt — all of it becomes food for fungal decay and wood-boring insects. Bishop's Stortford's stock of Victorian terraces, Edwardian villas and timber-framed village cottages gives us plenty of both, and treating rot and woodworm properly is as much a part of our work as the damp proofing that prevents it.

Dry Rot — The One That Spreads

Dry rot (Serpula lacrymans) is the most serious timber decay found in UK buildings. Despite the name, it starts with moisture — typically timber persistently above 20% moisture content — but once established it can transport its own moisture through strands (mycelium) that travel over and even through masonry, spreading far beyond the original damp area into perfectly dry timber elsewhere in the building.

How to recognise dry rot

• Timber that's cracked into cuboidal chunks along and across the grain, dry and crumbly to the touch
• White, cotton-wool-like growth in damp, unventilated spaces, or grey-white strands across brickwork
• A rusty-red, pancake-shaped fruiting body — often the first thing owners actually see
• Fine red-brown spore dust settling on surfaces near the outbreak
• A distinctive mushroomy smell, especially under floors and in cellars

Because it spreads, dry rot is never a "keep an eye on it" problem. Treatment means finding and fixing the moisture source, opening up to trace the full extent of the outbreak, cutting out decayed timber with a safety margin, applying fungicidal treatment to surrounding timber and masonry, and reinstating with pre-treated timber and proper ventilation. We do all of it, and the work carries a long-term guarantee.

Wet Rot — More Common, Less Dramatic

Wet rot covers several fungi (most often Coniophora puteana, the cellar fungus) that decay timber which stays wet — around 50% of the timber jobs we attend. Unlike dry rot it stays confined to the damp timber itself, which makes it more localised and generally cheaper to put right, but left alone it will quietly destroy floor joists, window sills, door frames and roof timbers.

Typical signs

• Timber that feels soft and spongy, even through paint, and darkens in colour
• Paint that's intact on the surface while the wood beneath has decayed — press it and it gives
• Localised decay around a clear moisture source: leaking gutters, bridged sills, plumbing leaks, damp solid floors
• A damp, earthy smell in the affected room or void

Treatment is straightforward when caught early: cure the moisture source, cut out and replace decayed sections (or splice/resin-repair where joinery is worth saving), and treat adjacent timber with preservative. We often find and fix wet rot during rising damp and penetrating damp works, where skirtings and joist ends have suffered alongside the walls.

Woodworm Treatment

"Woodworm" is the larvae of wood-boring beetles — in this area, overwhelmingly the common furniture beetle (Anobium punctatum). Adults lay eggs in bare timber; the grubs then tunnel inside for three to five years before emerging, leaving the small round flight holes everyone recognises. Floorboards, joists, rafters and staircases in older Stortford properties are the usual victims.

Active or historic?

Most woodworm we're asked to look at is long dead — old flight holes are almost universal in period timber. The signs of an active infestation are fresh, clean-edged holes with pale timber inside, gritty dust (frass) around or below them, and emergence typically between May and September. Beetles also need timber moisture above roughly 12% to thrive, which is why infestations cluster in damp subfloors and lofts — and why fixing the damp is part of any lasting treatment.

How we treat it

We confirm whether the infestation is live, identify the beetle species (a few, like deathwatch beetle in old hardwoods, need a different approach), treat affected timbers with an insecticidal fluid that kills larvae as they feed and prevents re-infestation, and replace any timber weakened beyond safe use. Mortgage lenders often require exactly this — a specialist inspection and treatment with a guarantee — before releasing funds on period property purchases, and we provide the documentation they ask for.

What Does Timber Treatment Cost?

Woodworm treatment for a typical loft or floor starts around £400–£600. Wet rot repairs depend on how much timber needs replacing — often £300–£1,000. Dry rot eradication is the most variable because the opening-up and reinstatement dominate the cost; small contained outbreaks may be under £1,500 while extensive ones run considerably more. Every job starts with a free survey and a written, itemised quote.

Frequently Asked Questions