Water is the thing that totals RVs. It rarely announces itself — it seeps at a seam for months, and by the time a ceiling spot appears the framing behind it is soaked. The defense is a boring inspection you repeat on schedule.
Know your roof
Most RVs wear a rubber membrane (EPDM or TPO), fiberglass, or aluminum. The membrane itself seldom fails in the middle — failures happen at penetrations: vents, skylights, the A/C, antennas, and the long front and rear cap seams.
The quarterly 20-minute check
- Walk (or ladder-inspect) the roof and examine every bead of sealant around every penetration.
- You are looking for cracks, lifting edges, gaps and chalky, shrunken lap sealant.
- Inside, sweep cabinets and corners with a flashlight for soft spots, stains or musty smell — and press the ceiling around vents.
Reseal the right way
- Use self-leveling lap sealant on horizontal roof seams, and the non-sag version on vertical surfaces — and match the sealant to your roof material (some products attack EPDM).
- Clean the old bead area thoroughly first; new sealant over dirt peels.
- You generally do not need to strip sound old sealant — cap over it after cleaning.
Calendar it
Inspect quarterly and after any branch strike or hail. Expect to refresh lap sealant in spots yearly and more comprehensively every few years. An annual tube or two of sealant is the cheapest insurance in RV ownership — the repair it prevents is measured in thousands.
Before your next trip: run the free 47-item pre-trip checklist. Gearing up? The Camp-Ready Gear Guide ($17) covers 50 picks by budget tier, and the RV Life Launchpad course ($97) walks the whole system from rig choice to life on the road.