Moisture may come from rain leaks, wet textiles, condensation on cold surfaces or plumbing remnants. A sealed RV is not automatically dry, and dehumidifiers do not repair leaks.
Step-by-step guide
1. Find and fix water entry
Inspect roof seams, windows, vents, doors and floor penetrations. Repair compatible seals before storage; investigate stains rather than covering them.
2. Dry the living space
Remove wet mats, linens, towels and food. Clean refrigerators and leave appliance doors open if recommended.
3. Choose ventilation carefully
Use manufacturer-approved ventilation or moisture control that does not admit rain or snow. Do not leave windows open where storms can drive water inside.
4. Monitor humidity
A battery-powered humidity logger can show trends. Check for condensation on windows, cold walls and hidden compartments.
5. Respond to warning signs
Investigate persistent odours, damp panels or visible growth promptly; substantial contamination may require a qualified remediation professional.
Common problems and what to check
| What you notice | Possible cause | Next step |
|---|---|---|
| Condensation on windows | High humidity and cold glass | Find moisture source and improve approved ventilation |
| Dark staining around a vent | Possible roof leak | Inspect exterior seal and underlying material |
| Persistent musty smell | Hidden moisture or mould | Investigate before using the RV |
Canadian winter considerations
Coastal climates may be damp even without severe freezes; Prairie winters may be dry but still create condensation when warm humid air meets cold surfaces.
Check local forecasts, provincial road information and storage facility rules before you travel or work outdoors. Conditions vary widely between the Pacific coast, the Prairies, Atlantic Canada and the North.
Recordkeeping and follow-up
Save dated photographs, service receipts, product labels and inspection notes. Note any unresolved problems so they can be inspected before the RV returns to service. Where procedures involve gas, high-voltage electricity, structural repairs or vehicle lifting, use a qualified technician.
Useful Canadian resources
- Environment and Climate Change Canada — forecasts and alerts
- Government of Canada — emergency preparedness
- RV Storage Canada — facility directory (related directory)
Related winterizing guides
- RV Winter Storage Preparation Checklist
- How to Winterize RV Plumbing With Antifreeze
- RV Battery Storage in Canadian Winters
- Rodent and Pest Protection for Stored RVs
← All winterizing and storage guides
Damp winters
Control humidity with ventilation and moisture absorbers, keep surfaces dry and look for leaks that feed mould.