RV Roof Leaks:
Catching Them Early

Roof leaks are the most expensive thing an RV owner can ignore, and they are almost always cheap to prevent and costly to fix. The gap between those two numbers is measured in months.

Why Austin is hard on roofs

Self-levelling lap sealant — the white bead around every vent, skylight, antenna base and cap seam — is a consumable, not permanent. UV breaks it down, and long runs of 100°F+ break it down faster. A roof that sealed fine two summers ago can have hairline cracking through every bead now. Add sudden hard rain onto a roof that has been baking, and water finds the gaps.

What to look for, twice a year

• Cracking, shrinking, chalky or lifting sealant anywhere on the roof
• Sealant that has pulled away from the edge of a vent flange
• Standing water that does not drain, or a low spot that holds it
• Any softness underfoot on the roof — that is decking, and it is serious
• Tears, punctures or bubbling in the membrane

Signs from inside

Interior symptoms mean water has been getting in for a while:

• Staining or discolouration on ceiling panels, especially near vents and at edges
• A musty smell that does not clear with airing out
• Soft or spongy spots in the ceiling or upper walls
• Wallpaper or panelling lifting at a seam
• Delamination — a visible ripple or bubble in the sidewall from outside

The important thing about stains

Water travels along framing before it drops. The stain on your ceiling is frequently nowhere near where the water is actually getting in, which is why chasing the stain rather than finding the entry point tends to fail. Tracing it properly is most of the job.

Staying ahead of it

An inspection and reseal is a service call plus an hour or two of labor. Soft decking and delamination are structural and cost many times more. Annual inspection is not a maintenance ritual here — it is the difference between those two jobs, and the earlier someone looks, the more likely yours is still the cheap one.