NL
Damp damage is the most expensive setback for motorhome owners, but by ventilating properly, draining water regularly, keeping tanks dry and having preventive damp measurements taken in the walls during servicing, you can avoid most problems. The damage often starts invisibly, but can grow into mould, wood rot and repairs costing thousands of euros. Want to know how to avoid this? Read on for practical tips that really work.
Why damp so quickly becomes a problem in motorhomes
A motorhome is compact, and in a small space moisture builds up very quickly. There are plenty of sources: the air you breathe out, cooking, showering, wet clothes and condensation caused by temperature differences. Leaks through windows, roof hatches or ageing sealant joints make the problem worse. In colder periods, condensation forms when warm, moist air cools down against cold surfaces. That moisture penetrates walls, floor and insulation.
During the annual service and a thorough motorhome check and maintenance, damp damage often only comes to light. Because many problems start out of sight, taking preventive action is the best strategy.
‘ Even in winter it’s important to ventilate, as long as it’s dry and safe to do so. ’
Ventilate consistently and thoroughly while in use
Ventilation is the basis of damp prevention. Open windows, roof hatches or ventilation grilles regularly to remove moist air. Always keep ventilation openings clear and don’t block them with belongings or clothing. Even in winter it’s important to ventilate, as long as it’s dry and safe to do so. While cooking and showering, make sure extra air can escape by putting a window on the latch or using a roof fan.
A short, powerful air change often works better than leaving a small gap open for a long time. Five minutes of good through‑ventilation can be enough to remove excess moisture. After showering, dry the walls and floor immediately with a towel and then allow the bathroom or wet room to air thoroughly.
Drain water from pipes and tanks
Standing water in tanks and pipes is a source of moisture and mould. When the motorhome is not being used for a longer period, drain all the water from tanks, pipes and boiler. This not only prevents damp damage, but also freezing in colder periods.
Even while you are using the motorhome, it’s wise to check regularly that no water is left in pipes or connections. Check water points and hoses for condensation. Stay alert to damp patches around taps and penetrations. Small leaks often go unnoticed until the damage has spread.
Keep tanks dry during winter storage
If the motorhome is stationary for a longer time, a dry storage environment is important. Put the motorhome away clean and completely dry. Open cupboard doors so air can circulate. Lift mattresses or cushions or store them in a way that allows air to circulate. Also leave the fridge door slightly open.
Ideally choose a dry, ventilated storage facility. Use moisture absorbers to capture extra moisture, but see them as support rather than a replacement for good ventilation. Place moisture absorbers on stable spots where they can’t tip over and check the collection trays regularly. Replace them in time before they overflow.
‘ Early detection prevents far bigger problems later on. ’
Have damp in the walls measured preventively during servicing
An annual damp inspection is sensible, especially for older motorhomes or after buying a second‑hand one. A damp meter shows irregularities in walls, floor and ceiling before damage becomes visible. Pay particular attention to areas around windows, roof hatches, corners of walls and floor edge joints.
If in doubt, you can have a specialist take measurements. Early detection prevents far bigger problems later on. Areas that have been repaired before deserve extra attention, because leaks can recur there more easily. A measurement helps to uncover hidden problems and enables targeted repairs.
Check sealant joints and rubber seals regularly
Leaks often start in places you don’t immediately see. So check sealant joints around windows and roof hatches, rubber seals on doors and windows, screw holes and penetrations regularly. Connections of water pipes, hoses and taps, and places where accessories have been fitted, are also vulnerable.
Replace damaged or dried‑out sealant in good time. Unsure about a particular spot? Have it checked or repaired before it turns into a leak. Small interventions now prevent major damage later.
Spot signs of damp damage early
Watch out for warning signs such as a musty smell, discolouration or tide marks, mould patches and walls that feel soft or bulging. Peeling wallpaper or upholstery, silverfish, and a cold or clammy patch on one part of a wall also point to damp problems.
If you notice these kinds of signs, act quickly. Waiting only makes the damage greater and more expensive. Find out straight away where the moisture is coming from and tackle the cause, not just the visible damage.
‘ You should never ignore a leak, not even for a short time. ’
What you’re better off not doing
A lot of damp damage is caused by simple mistakes that are easy to avoid. Don’t seal off ventilation grilles, even when it’s cold. Don’t leave wet items lying around in the motorhome. You should never ignore a leak, not even for a short time.
Don’t just tidy up the visible damage without finding the cause. After heavy rain, winter storage or repairs, always carry out a check. These small efforts save you a lot of trouble.
Handy maintenance routine for motorhome owners
A simple routine prevents many problems. Before departure, check windows, hatches and rubber seals. See whether ventilation openings are clear and check that there is no musty smell. While using the motorhome, ventilate when cooking and showering, dry damp spots immediately and don’t let moisture build up in corners and cupboards.
After use or before putting the motorhome into storage, air it thoroughly. Open cupboards, remove damp textiles and check for condensation and leaks. This routine takes little time, but prevents a great deal of damage.
Be extra careful with second‑hand motorhomes
With a second‑hand motorhome, damp checks are extra important. Damp damage may already be present without being immediately visible. So don’t only look for cosmetic damage, but also pay attention to smells, whether materials feel soft, and unusual damp patches. If in doubt, have a damp measurement done before you buy.
‘ If you have these basics in order, you significantly reduce the risk of mould, leaks and costly repairs. ’
This is how you keep your motorhome dry and safe
The best way to prevent damp damage is a combination of good ventilation, regular inspections, drying quickly after use, replacing sealant and rubber seals in time, measuring damp preventively and storing smartly in a dry environment. If you have these basics in order, you significantly reduce the risk of mould, leaks and expensive repairs.
On the Traveler Tips website you’ll find plenty more practical information about motorhome maintenance, smart preparation and reliable tips for your next trip. Discover more useful articles and plan your next holiday with confidence.
Frequently asked questions
Before departure, check all sealant joints, window and door rubbers, roof hatches and penetrations for cracks or drying out, and have any questionable areas re‑sealed or repaired. Air the motorhome thoroughly several times, check that all ventilation grilles are clear and, if necessary, plan a professional damp inspection, especially with an older or second‑hand motorhome. When in storage, or in the run‑up to your trip, leave cupboard doors open, raise mattresses slightly and remove all damp textiles so air can circulate everywhere. You can use moisture absorbers as support, but always make sure there is sufficient natural ventilation.
Check daily for condensation on windows, corners, ceiling and around roof hatches, and wipe this dry straight away. Consciously notice whether a musty smell is developing and look for discolouration, small mould patches or soft/bulging walls and floor edges. Each week, go over all sealant joints, window and door rubbers and penetrations checking for cracks, loose sealant and visible leaks, especially after rain. Feel inside cupboards, under mattresses and around the wet room to see whether it feels clammy or noticeably cold/damp there.
Damp damage most often occurs around windows and roof hatches, at sealant joints and rubbers, in wall corners, around floor edge joints and in the wet room. You recognise it by a musty smell, discolouration or tide marks, mould patches, peeling upholstery and soft or bulging panels. Check these areas regularly, both visually and by touch, especially after heavy rain or winter storage. If in doubt, have a damp measurement done to detect hidden damage early.
While on the road, ensure regular, short bursts of powerful ventilation by opening windows or roof hatches opposite each other, especially during and after cooking or showering. Wipe condensation off windows and cold walls immediately with a cloth, and remove or dry wet clothes and shoes outside the living area. Use simple moisture absorbers as support, for example overnight or in damp weather. After each leg of your journey or trip, air cupboards, mattresses and cushions for a while so moisture doesn’t get the chance to build up.
Damp damage reduces your comfort because it causes a musty smell, mould, clammy walls and potentially health complaints. In the long term it affects materials, leading to wood rot, peeling upholstery and structural damage. As a result, the reliability and lifespan of your motorhome decrease and unexpected, often high, repair costs increase. Altogether, this makes your trips less carefree and can considerably reduce your enjoyment of travelling.
