How to Find and Fix a Campervan Roof Leak

Water coming into the living area is alarming, but the leak itself is usually repairable — the real enemy is time. Left alone, a small roof leak soaks the timber frame, triggers damp rot and eventually writes off the van. Act fast, trace the source properly, and you can often fix it in a single afternoon for the price of a tube of sealant.

Signs of a roof leak

• Brown staining on the ceiling or along a wall.
• A soft, springy patch on the roof or ceiling board.
• A musty smell when you open the van after rain.
• Water droplets or beads on the inside of windows.

The golden rule of roof leaks: water runs downhill and along panels before it drips, so the visible stain is rarely directly below the entry point. The source can be a metre or more away, often higher.

Tracing the source

On a dry day, go up with a torch and work methodically:

1. Inspect every roof seam, especially where the roof meets the front and rear caps.
2. Check around the roof light, aerial and any solar panel mounting feet.
3. Look at the sealant bead — is it cracked, lifting or missing in places?
4. Wet the roof with a hose on a section-by-section basis while a helper watches inside for the drip.

Doing the repair

For a DIY fix you'll need a solvent cleaner, a good PU or polymer sealant (around £10-£20 a tube) and some patience:

• Clean the area thoroughly and let it dry completely — sealant won't stick to a damp surface.
• Remove any loose or perished old sealant with a scraper.
• Apply a continuous, smooth bead of sealant along the seam or around the fitting.
• Leave it to cure fully (check the tube — often 24 hours) before exposing it to rain.

Window seals and roof lights are the most common offenders. If the seal between the frame and roof is gone, remove the frame, clean both faces and reseat it on fresh sealant.

When to call in a professional

If the ceiling board is soft or you can see water staining on the wood frame, the timber is already wet and needs proper drying and treatment. Expect £200-£500 for a professional roof reseal, and budget more if damp remediation is involved.

Tip: never just paint over a wet ceiling stain — the water is still in the board and the problem will keep growing.

Even after a successful repair, keep checking for new staining. A thorough damp survey is part of the campervan annual maintenance checklist, and it's how you catch the next leak while it's still cheap. Vans that have never leaked read clean on a damp meter — look for that reassurance on campervans for sale.