Water damage is the single most expensive problem an RV owner will ever face — and it almost always starts at the roof. By the time you see a stain on the ceiling, the damage underneath is usually ten times worse than what you can see. The good news: a 15-minute inspection every season is enough to catch nearly every roof issue before it becomes a structural rebuild.
Start with a visual walk-around from a ladder. You're looking at the entire roof surface — most modern RVs use either TPO, EPDM rubber, or fiberglass. Each ages differently, but all three share the same enemy: failed sealant. Pay close attention to every penetration: roof vents, AC shrouds, antennas, satellite mounts, refrigerator vents, skylights, plumbing vents, and the front and rear caps.
Look for three things at every sealant bead: cracking, lifting, and discoloration. Hairline cracks let water wick in slowly over months. Lifted edges let water flood in during a single rainstorm. Brown or black discoloration usually means the sealant has already failed and water is sitting underneath. Self-leveling lap sealant is the correct product for horizontal seams; non-sag sealant is for vertical seams on the sidewalls and end caps. Never mix the two.
Inside the coach, look for the early warning signs. Soft spots in the floor near slide-outs or along the walls. Stains on the ceiling, especially in corners. A musty smell that doesn't go away. Wallpaper or trim that's pulling away from the wall. Any of these mean water has already made it past the roof and into the structure — stop reading and call a professional immediately.
Resealing a roof is a maintenance item. Rebuilding a rotted roof, replacing delaminated sidewalls, or tearing out a soaked floor is a five-figure repair. The difference between the two is usually six months of ignored sealant.
Know when to call a pro. If you're uncomfortable on the roof, if you see active leaks, if the membrane itself is damaged, or if you suspect any interior water intrusion, get a qualified mobile tech out for a proper inspection. We use moisture meters, thermal imaging, and 30 years of pattern recognition to find what your eyes will miss. A $200 inspection today is the cheapest insurance you'll ever buy.