How to Check for Damp in Your Caravan or Motorhome
- IDS Camping & Leisure
- Apr 8
- 2 min read
Damp is one of the most common and costly issues for caravan and motorhome owners. If left undetected, it can lead to structural damage, bad smells, mould, and even health risks. Whether you're doing regular maintenance or inspecting a new purchase, knowing how to check for damp can save you a lot of money and hassle in the long run.
Why Damp Happens
Damp can occur for several reasons:
Leaks around windows, doors, or roof lights
Cracked seals or joints
Poor ventilation and condensation build-up
Hidden pipe leaks or drainage issues
Signs of Damp to Look Out For
Before you get into testing, here are some visible and sensory signs of damp:
Musty or mouldy smells inside the vehicle
Soft, spongy or discoloured wall panels or flooring
Black spots or streaks (signs of mould or mildew)
Peeling wallpaper or bubbling laminate
Condensation on windows or walls
Tools You’ll Need
Moisture meter (also called a damp meter) — available from DIY stores or online
Torch or inspection light — for checking dark corners and under furniture
Notebook — to record readings if checking multiple areas
How to Check for Damp Step-by-Step
1. Start with a Visual Inspection
Check all seals around windows, doors, skylights, and vents. Look for cracks, splits, or areas where the sealant is peeling away. Pay close attention to corners, joins, and areas near the floor.
2. Use Your Nose
A musty smell is often one of the first signs of a damp problem. If it smells off — trust your instincts and investigate further.
3. Feel for Soft Spots
Gently press walls, especially in the corners and near windows or vents. If the panel feels soft, spongy, or you can feel movement, it’s a potential damp issue.
4. Use a Moisture Meter
Turn on your moisture meter and press the probes gently against the wall or ceiling panels. Pay extra attention to:
Corners
Underneath windows
Around doors and roof lights
Near the floor, especially at the edges
Moisture readings:
0–15%: Normal
15–20%: Monitor — possible early signs of damp
20–30%: Caution — investigate further
30% and above: Likely damp issue — professional inspection recommended
5. Check Hidden and Hard-to-Reach Areas
Lift seat cushions, remove bed bases, and look behind lockers and under flooring. Damp often starts in places that aren’t immediately visible.
Tips for Prevention
Always use roof lights or windows for ventilation, especially when cooking or showering
Use a dehumidifier or moisture traps during winter or when the caravan is in storage
Regularly inspect and reseal joints and seals with caravan-specific sealant
Use breathable covers if storing your caravan or motorhome outside
When to Seek Professional Help
If you get consistently high readings or notice structural softness, it’s best to consult a professional. Damp repair can be invasive and time-consuming, so catching it early is key.
Final Thoughts
Regular damp checks should be a part of every caravan or motorhome owner’s routine — especially before or after the winter season. It only takes a few minutes, and it could save you from costly repairs and loss of value. Stay dry, stay safe, and enjoy peace of mind on your travels!
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