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A campervan with wet windows and damp cushions in the morning usually shows not a leak but a build-up of moist air.

A campervan with wet windows and damp cushions in the morning usually shows not a leak but a build-up of moist air. Warm breath, cooking and wet coats bring litres of water vapour daily into a small, poorly ventilated space. As soon as that vapour hits cold walls or single glazing, it condenses into droplets and mould gets free rein.
You often recognise the problem first from misted windows in the sleeping area or damp corners behind cupboards. A hygrometer will give you certainty: at a relative humidity above 60%, active dehumidifying and airing are needed to prevent structural damage.
Condensation in a motorhome is a common occurrence, especially when you travel in the shoulder season or in winter. The warm air inside can hold more moisture than the cold air outside. As soon as that moist air comes into contact with cold surfaces such as single glazing, aluminium frames or poorly insulated corners, the water condenses. This leads to misted windows, wet window sills and eventually black mould spots on sealant seams, wall coverings or behind cupboards.
The difference with real water damage is important. Condensation is usually a matter of ventilation and living habits, whereas a roof leak or other moisture problem often gives a clearly defined, recurring damp patch, even when you are not staying in the motorhome. In doubt? Then measure the humidity with a hygrometer. A relative humidity above 60% points to insufficient ventilation. Also check the edges of the ceiling and the corners of the walls for discolouration or soft spots.
The most common causes of condensation are:
Mould spots are best tackled as soon as possible. Clean the area with a mixture of water and vinegar or a special mould remover. Then dry the area thoroughly and improve ventilation. If the mould keeps coming back, there may be a hidden moisture source, such as a leak or a poorly fitted window rubber.
If everything points to a structural moisture problem, a thorough inspection is needed. Sometimes the repair is simple, but often the costs are high and the risk of recurrence remains. In that case, selling with defects can be a sensible choice, especially if you no longer want to invest in a motorhome that keeps causing worries.
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We buy campervans, even with condensation or moisture problems. Request a free valuation today and discover what your campervan is still worth.
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