Timber and woodworm in Boston
Timber decay is damp's slow second act. In a town built over a high water table, the timbers most at risk are the ones you cannot see: joist ends bearing into solid walls, and floorboards over a poorly ventilated void.
Most of Boston's pre-war houses stand on suspended timber ground floors, with a shallow void between the boards and the fen silt below. That void is supposed to be kept dry by through-ventilation from air bricks. Over the decades many have been blocked by raised paths, rendered over, or buried when yards were concreted, and the void underneath turns humid. Damp, still air over damp ground is exactly what wet rot and wood-boring beetles need.
Upstairs the risks are different but related: roof timbers wetted by a leaking chimney or slipped slates, and joist ends slowly softening inside a wall that carries rising or penetrating damp. None of it announces itself until a floor feels springy or a skirting crumbles under a vacuum cleaner.
What the specialist looks for
| Problem | Tell-tale signs | Usual cause |
|---|---|---|
| Wet rot | Soft, darkened timber, flaking paint on skirtings and sills | Persistent damp from the wall or ground, failed sub-floor ventilation |
| Dry rot | Cuboidal cracking, rusty spore dust, grey strands crossing masonry | Concealed damp with poor airflow, often after a long-term leak |
| Common furniture beetle | Fresh 1 to 2 mm flight holes and powdery frass, usually noticed in summer | Beetles favouring timber with a raised moisture content |
| Weakened joist ends | Bouncy or sloping floors, gaps opening at skirting level | Joists bearing into damp solid brickwork for decades |
Treatment, in the right order
- Confirm activity. Old flight holes are everywhere in old towns. Treatment is only worth paying for if the infestation or decay is live.
- Cure the moisture first. Beetle and rot both need damp timber. Reinstating air bricks, fixing the damp source and letting timbers dry is half the treatment.
- Treat and repair. Targeted insecticidal or fungicidal treatment of affected timbers, and splicing or replacing anything structurally weakened.
- Keep it dry. The report notes the ventilation and maintenance needed to stop it coming back.
Buying an older Boston property
Timber condition is a standard worry on pre-war houses near the town centre, and surveyors often recommend a specialist timber inspection before exchange. That inspection can be combined with a full damp survey, which is usually the sensible way round: the damp findings explain the timber findings.
Related pages: rising damp treatment, condensation and mould.
Springy floor or fresh boreholes
Describe what you have found and where. The specialist will say whether it needs an inspection, and quote before any work.
Request a quote