A small split in a roof seal can turn a great week on the tracks into a damp, expensive recovery job. Knowing how to inspect caravan seals gives you the chance to find trouble in the driveway, rather than after a night of hard rain at a remote campsite.
For caravans built to travel beyond the bitumen, seal checks are part of sensible ownership. Corrugations, heat, dust, UV and water crossings all work on joints and fittings over time. A well-built van is designed to handle tough conditions, but every caravan benefits from regular attention around the areas where panels, windows, hatches and services meet.
Why caravan seals deserve regular attention
Water does not always announce itself with a drip from the ceiling. It can track behind an awning rail, around a clearance light or beneath a window frame before appearing metres away inside the van. By then, moisture may have affected timber, insulation, electrical connections or internal finishes.
The Australian climate adds another challenge. Strong UV can dry and crack exposed sealants, while summer heat makes materials expand and cooler nights make them contract. Add thousands of kilometres of vibration on corrugated roads and even a minor gap can become a pathway for water and dust.
A seal inspection is not just about preventing leaks. It protects resale value, helps maintain a comfortable interior and lets you head away with greater confidence. If you tour regularly, inspect seals before major trips and after extended periods on rough roads or in storage.
How to inspect caravan seals: start with a clean, dry van
Choose a dry day with good light. Wash the caravan first, then let it dry completely. Dirt can hide cracks, lifted edges and failed sealant, so a clean surface makes a proper assessment much easier.
Park on level ground and work methodically around the exterior, starting at one corner and moving in the same direction. Take photos of anything that looks questionable. This creates a useful record and helps you see whether a small crack or gap is getting worse between inspections.
You will need a stable ladder or platform for higher areas, a torch, clean rags and a plastic trim tool if you need to gently check an edge. Avoid sharp metal tools, which can damage paintwork, cladding or the seal itself. Gloves are worthwhile when working around roof fittings and awning hardware.
Check the roof first
The roof is the most exposed part of any caravan and is often where leaks begin. Inspect every roof penetration closely, including vents, hatches, air-conditioners, solar cable entries, TV aerials, roof lights and any plumbing fittings.
Look for sealant that has cracked, shrunk, lifted away from the surface or developed a chalky, brittle appearance. Pay close attention to corners and screw heads. If the sealant is still flexible, firmly bonded and continuous, it is generally doing its job. If you can see a gap between the sealant and the roof or fitting, it needs attention.
Do not walk on the roof unless your manufacturer confirms it is suitable and you can do so safely. A stable ladder lets you inspect most roof-edge seals from the side. For hard-to-reach areas, a caravan service technician is the safer option.
Inspect roof joins, mouldings and rails
Run your eyes and fingers along roof-edge mouldings, front and rear joins, awning rails and J-moulds. These long runs of sealant can look sound from a distance while hiding short separations at screws or ends.
Check for loose fasteners, staining below a joint, or sealant that has pulled away where two materials meet. Dust lines can be revealing too. Fine red dust inside a storage compartment or around a window can point to a compromised external seal, even if no water has entered yet.
Work down the sides of the caravan
Windows, entry doors, external hatches and service points all rely on correctly fitted seals. Start at the top of each fitting and inspect the full perimeter, because water naturally works downward and often enters at the upper edge.
Window seals should sit evenly against the wall, without bulges, splits or sections that have hardened. Open each window and check that it closes squarely and latches without excessive force. A window that is misaligned can place uneven pressure on its seal.
For doors and hatches, inspect both the outer sealant around the frame and the rubber compression seal on the opening itself. The rubber should be clean, supple and free from tears. Leaves, sand and grit can stop a hatch sealing properly, so wipe these surfaces with a damp cloth before you head off.
Take extra care around the following areas:
- entry doors, tunnel boots and front storage hatches
- external shower boxes, water fillers and power inlets
- fridge vents, external speakers and access panels
- marker lights, tail-lights and reversing cameras
- awning mounts and any accessories fixed to the body
Do a close check underneath
Underside seals are easy to overlook, particularly on an off-road caravan that spends time on unsealed roads. Use a torch to inspect lower body joins, wheel arches, pipe and cable penetrations, and the joins around tanks or underbody protection.
Look for damage from stones, branches and road debris. Fresh dust trails, water marks or loose underbody material may indicate that a seal has been disturbed. If your caravan has recently travelled through deep water, inspect these areas promptly and rinse away mud that could hold moisture against fittings.
Check inside for the early warning signs
An external inspection tells only half the story. Inside, open cupboards, lift seat cushions and inspect the corners around windows, roof hatches and external service points. Use your nose as well as your eyes. A musty smell, even without visible mould, can suggest trapped moisture.
Feel for soft wall sections, swollen cabinetry, discolouration, bubbling vinyl or staining around screws and trims. Condensation can cause some moisture inside a caravan, especially during cool weather, so consider the circumstances. A single fogged window after cooking is not necessarily a leak. Repeated dampness in the same corner after rain deserves investigation.
A moisture meter can provide useful evidence, but it is best used with care. Readings vary depending on the material and construction, and an elevated reading does not always identify the source. If you find signs of moisture, a professional caravan water-ingress inspection can pinpoint the issue before repairs become more involved.
When to reseal - and when not to
It can be tempting to run a bead of silicone over every suspect joint. That approach can create more problems than it solves. The wrong product may not adhere properly, may react poorly with existing sealant, or can make a later professional repair far more difficult.
Use a sealant approved for caravan applications and compatible with the surface being repaired. In many cases, the correct repair means removing failed material, preparing the surface thoroughly and resealing the fitting properly - not simply covering a crack. If a window, hatch or roof fitting is loose, resealing from the outside alone will not fix the underlying issue.
For small maintenance jobs, follow the product instructions closely and allow adequate curing time before exposing the caravan to rain, washing it or heading onto dusty roads. For roof-mounted equipment, large joins, structural areas or suspected water ingress, book a qualified caravan technician. It is the smarter call when your van’s long-term condition is on the line.
Build seal checks into your touring routine
A thorough inspection before a big trip is essential, but a quick walk-around takes only a few minutes at other times. Check seals after a long haul on corrugations, after a severe storm, before storing the caravan and when bringing it out for the season.
Keep the exterior clean, clear debris from roof areas and avoid harsh cleaners that can dry out rubber seals. Record any repairs in your maintenance file alongside servicing records. That history is valuable when diagnosing future issues and reassuring a potential buyer that the caravan has been cared for properly.
Cub Campers are built for Australians who want to own the adventure, from weekends away to long-haul remote touring. Looking after seals is one of those straightforward habits that helps keep the focus where it belongs: on the track ahead, the campsite you have earned and the freedom to stay out longer.