RV Roof Inspection: What I Check Every Spring

Every spring, before the Florida rain settles in for the season, I do a full roof inspection on every rig I look after — and I tell my customers to do the same. Not a glance from a ladder. A real inspection, on my knees, one joint at a time. Most roof leaks don’t start in the middle of a storm. They start as a crack in sealant you could have covered in five minutes, months earlier, while everything inside still looked dry.

Here’s the order I work in, and what I’m actually looking for at each stop.

First, check inside before you climb

Start in the living room, not on the ladder. Look at the ceiling, inside the upper cabinets, and along the tops of the walls. A faint stain, a bubbled panel, or that sweet musty smell tells me where to spend extra time up top. Water travels, so the stain isn’t the leak — but it’s a witness. Note where it is, then go find what’s above and uphill from it.

Get up there safely, and clean before you judge

Use a solid ladder, pick a dry day, and move like the roof is wet even when it isn’t. If your roof isn’t built to be walked on, spread your weight with boards — don’t guess with your knees. Then wash the roof or at least brush and wipe the areas you’ll inspect. Dirt hides cracks. I can’t count the failed sealant I’ve only seen after a rag went over it.

1. Scan the membrane itself

Walk the whole surface slowly. I’m looking for cuts, tears, punctures from branches, bubbling, and any spot that feels soft or spongy underfoot — soft decking means water has already been underneath, and that changes the job from maintenance to repair. On rubber roofs, heavy chalking and exposed reinforcement are wear warnings, not decoration. Note it, photograph it, and don’t pretend a coating fixes rotten wood. It doesn’t.

2. Test every sealant joint, not just the ugly ones

This is the heart of the inspection. Check the sealant around every vent, skylight, vent pipe, antenna base, and screw head. Don’t just look — touch it. I press and gently pick at the edges with a plastic scraper. Good sealant is bonded and flexible. Failed sealant cracks, lifts, separates from the surface, or has voids and pinholes you can see daylight thinking about. If an edge peels up with light pressure, water is already going under it.

Manufacturers commonly tell owners to inspect roof sealants about every 90 days, and this spring pass is the deep version of that check. The 90-day look can be quick. This one isn’t.

3. Work the seams and the edges

Front and rear cap seams, side rails, and the roof-to-wall edge get flexed every mile you drive, so they crack first. Run them end to end. Pay attention where sealant has been piled on over old sealant season after season — that buildup hides the failure underneath it. If it’s loose, it comes off. New product over lifting product just inherits the leak.

4. Vents, skylights, and the air conditioner

Plastic up here lives a hard, sunny life. Check vent lids and skylight domes for cracks and brittleness — if it crunches or crazes when you press lightly, it’s done, replace it before it shatters in a storm. Check the AC shroud for cracks and make sure its fasteners are snug, and confirm nothing is nesting in places nothing should nest. Anything that penetrates the roof gets the same sealant test as the vents. No exceptions for “that one looks fine from here.”

Fix what you find — the same day, the right way

• Small cracked or lifting spots: remove what’s loose, clean the joint, let it dry, and touch up with the correct product.
• Flat, horizontal joints: self-leveling lap sealant. My standard is Dicor 501LSW-1 Self-Leveling Lap Sealant — made for EPDM, TPO, and PVC roofing.
• Edges and anything not perfectly flat: non-sag lap sealant, so it stays where you put it instead of running.
• Long seams that keep cracking back: EternaBond RoofSeal tape can be the right call — on a clean, dry, properly prepped surface, never over dirt or loose sealant.
• Soft decking, active stains, or a membrane that’s torn or worn through: that’s a repair, not a touch-up. Don’t seal over it and hope.

The habit that actually saves roofs

Take dated photos of every joint, every spring. Memory lies; photos don’t. A seam that looks “about the same” in your head will show you a season of cracking when you put two springs side by side. Then keep the quick 90-day checks on your calendar between the big ones. Twenty minutes, four times a year. That’s the whole secret — there is no product that lets you skip looking.

An RV roof rarely fails all at once. It fails one ignored joint at a time, quietly, over a ceiling you don’t see until it stains. Climb up in the spring, touch every seam, fix the small stuff the same day, and that roof will outlast everybody’s expectations — including yours.

As an Amazon Associate I earn from qualifying purchases. Product links above are affiliate links.