RV sidewall bubbles and delamination: the check, the cause, and the cost

A bubble or soft spot on an RV sidewall almost always starts the same way: water gets behind the fiberglass or aluminum skin through a failed seam, and the bond to the substrate underneath breaks down. Catching it small keeps the repair small.

Check this first (five minutes)

Press gently on the bubble. A soft, slightly spongy give under light pressure confirms delamination rather than just a cosmetic surface flaw.
Look around the perimeter of the panel for the actual water entry point: a window seal, a seam between panels, a trim piece, or an impact mark.
Check nearby areas for smaller, less obvious bubbles. Delamination often has more than one spot once you start looking closely.
Note whether it is growing. A photo dated today, compared in a few weeks, tells you whether it is stable or actively spreading.

What is usually wrong

What you find	Likely cause	Fix and cost
Small, isolated bubble, stable size	Localized water intrusion, early stage	Injection repair: $300 to $900
Bubble near a window or trim edge	Failed seal letting water in	Reseal plus injection repair: $300 to $900
Bubble near a storage-yard scrape or impact	Damage broke the bond, water followed	Assess on site, repair scope depends on size
Multiple bubbles or a large soft area	Delamination has been progressing for a while	Larger repair, may need body-shop panel work
Bubble growing month to month	Active, ongoing water intrusion	Find and fix the leak first, then repair the panel

Ranges from the pricing page, on top of the $75 to $150 trip fee and $125 to $190 hourly labor.

Why this happens in Montgomery County

Gulf Coast humidity and a genuine wet season give water more chances to find a failed seam than a dry climate would, and heat cycling (a hot Texas afternoon followed by cooler night air) works the bond between skin and substrate over years. A rig that took a storage-yard scrape or a piece of storm debris also has a fresh entry point for water to start the same process. The fix in every case is the same two-part job: seal the entry point, then repair the bond underneath it.

What to expect on the call

Photos of the bubble and the surrounding panel, and how long it has been there if you know, help us plan the visit. We work on site across Conroe, Montgomery, Willis, The Woodlands, Magnolia, New Caney, and Huntsville. The fiberglass and delamination repair service page covers what the job involves and where mobile repair stops and body-shop work starts.

Frequently Asked Questions

What is delamination, exactly?

The fiberglass or aluminum skin of the rig separating from the foam or wood substrate underneath it, usually because water got behind the skin through a failed seam, seal, or impact point and the bond broke down over repeated heat and moisture cycles.

Is a small bubble an emergency?

Not usually, but it does not get better on its own, and it is far cheaper to fix small. A bubble caught early is often a localized injection repair for a few hundred dollars. Left for a season or two, the same spot can spread into a much larger, more expensive repair.

Can this be fixed without replacing the whole panel?

Often, yes, if it is caught while the affected area is still small. Localized delamination injection repairs the bond without removing the panel. Larger areas, or delamination that has been progressing for a long time, may need a body shop for panel-level work.

How do I stop it from coming back?

Fix the water entry point, not just the bubble. That usually means resealing the seam, window, or trim piece where the water got in. Repairing the bubble without fixing the leak is a repeat call waiting to happen.