What Is Moisture and Mould Management on Board?
The hidden enemy in a closed yacht is condensation – from under the cushions to the corners of lockers, ways to stop the cabin from falling prey to mould.
A yacht cabin is a sealed box where moisture production (sea air, wet kit and human breath) meets cold surfaces: the moisture condenses on cold areas and turns to mould in dead-air corners (under cushions, behind lockers, under mattresses). The clue behind the phrase 'there’s a smell coming from the boat' at the end of winter is almost always this.
There are three pillars to the job.
The three-part moisture management
Ventilation: air circulation; wintering a closed-up boat is an open invitation to mould, so locker doors are left ajar and hatches on mushroom vents.
Moisture removal: passive moisture absorbers or electric dehumidifiers (with a drain hose run to a sink, they will work unattended).
Breaking contact: under-cushion battens or mesh underlays; all textiles should be stored dry over winter, and where possible cushions and mattresses go home.
Mould is not just a smell: it leaves permanent stains on upholstery, mattresses and timber surfaces, and the allergy load is serious. The real test of a good winter lay-up is in spring: if the cabin is dry, odour-free and bright, the routine has been right. That is why cabin moisture and odour notes are a standard line in Care winter checks.