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Damp and mould on a houseboat: damage or maintenance?
Short answer
A houseboat that is lived in produces moisture all the time.
Policies draw a hard line between a sudden event, such as a hose letting go,
and gradual deterioration from condensation and too little ventilation.
On board, warm damp air from inside meets cold outer surfaces. Showering, cooking and simply breathing put water into the air, and it settles on window frames, behind lockers and in corners where nothing moves. Wherever it stays wet, mould grows and the timber underneath works and softens. So the first question is never how bad it looks, but where the water came from: out of the room air, in from outside through a failed seal, or from a pipe or hose.
That distinction is the same one an insurance policy draws. A sudden event is what a hull claim is built on, say storm damage to the roof or water entering after a collision. Moisture that builds over months, because the boat was barely ventilated or heated, or because a seal had been perished for a long time, is normally treated as gradual deterioration and is excluded in many wordings. With us only the named perils are insured, such as storm, fire or, from Basis Plus, an accident, and mould itself is excluded in every tier. How your own contract frames it sits in the insured perils and in the exclusions. Read both before you report anything.
Prevention does more here than any wording. Keep air moving across the boat and behind cushions, lockers and mattresses, hold a background warmth through the winter, and look at window seals, deck fittings and the bilge on a regular round. A simple hygrometer in the saloon shows early when things are tipping. If you find a wet patch, trace the source first and photograph what you find. Where a sudden event is behind it, report it straight away and have the area recorded before anything is dried out, because afterwards the sequence can hardly be shown at all.
Worth remembering
Sudden
A hose letting go or storm damage: an event with a date
Gradual
Condensation and perished seals over months
Trace the source and photograph it before drying anything out. After that the sequence is lost.
Questions
What owners ask us about this
Is mould on a houseboat treated as damage?
It depends entirely on the cause. Mould following a sudden event, such as a hose letting go, is looked at differently from mould after a winter of condensation. The second is normally gradual deterioration and excluded in many wordings. With us, mould itself is excluded in every tier.
How do I tell whether the water comes from outside?
Tide marks around window frames, hatches and deck fittings point to water coming in, while an even film on cold surfaces points to condensation. A moisture meter and a look round after heavy rain will usually settle it.
What should I record?
Photographs of the wet area before anything is dried, the date, the weather and what was last done to the boat. Add receipts for maintenance and the dates of your checks. That is what separates a sudden event from a long slow one.
Related
Not sure whether you qualify?
Whether it is “Damp and mould on a houseboat: damage or maintenance?” or another question: send us your residence and the flag your boat flies. You will get a straight answer in one email; including a no, if that is the answer.
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