Delamination is one of the most serious structural problems an RV can develop — and unfortunately, it's also one of the most common. If you've noticed bubbling, waviness, or soft spots on your RV's exterior walls, you may be dealing with delamination. Here's what it is, how it happens, and what you can do about it.

What Is RV Delamination?

Most modern RV sidewalls are built as a sandwich: an outer fiberglass or aluminum skin, a layer of adhesive, a foam or wood substrate, and an inner wall panel. Delamination occurs when the bond between these layers fails — the outer skin separates from the substrate beneath it.

The result is visible as bubbling, waviness, or a hollow sound when you tap the wall. In advanced cases, the outer skin may flex visibly when you press on it.

What Causes Delamination?

Water intrusion is the primary cause. When water gets into the wall assembly — through a failed roof seal, a cracked window frame, a damaged corner cap, or any other penetration — it saturates the substrate. Wood substrates rot; foam substrates lose their bonding properties. The adhesive fails, and the skin separates.

Manufacturing defects can also cause delamination, particularly in older RVs where adhesive formulations were less durable. Some RV brands had widespread delamination issues in certain model years.

Age and UV exposure degrade the adhesive over time, particularly on south-facing walls that receive intense sun exposure.

How to Spot Delamination Early

Early detection is critical — small delamination areas are repairable; large ones may require full wall replacement.

Visual inspection: Walk around your RV in good light and look for any waviness, bubbling, or distortion in the sidewalls. Pay particular attention to areas around windows, doors, slide-outs, and roof-to-wall seams.

Tap test: Knock on the sidewall with your knuckles. A solid wall produces a dull thud; a delaminated area sounds hollow.

Soft spots: Press firmly on the wall. A properly bonded wall should feel rigid. Any flex or give indicates delamination.

Interior signs: Water stains on interior walls, soft flooring near walls, or musty odors can indicate water intrusion that may be causing delamination.

Repair Options

The appropriate repair depends on the extent of delamination and whether the underlying cause (water intrusion) has been addressed.

Small, localized delamination (less than a square foot, no active water intrusion): In some cases, a technician can inject adhesive into the delaminated area and clamp it until the adhesive cures. This is only viable when the substrate is dry and undamaged.

Moderate delamination with dry substrate: The outer skin may be carefully cut, the substrate repaired or replaced, and the skin re-bonded. This requires skilled work to match the original appearance.

Extensive delamination or wet/rotted substrate: Full wall panel replacement is often the only viable option. This is a significant repair involving removal of the outer skin, complete substrate replacement, and installation of a new skin.

Critical first step: Before any delamination repair, the source of water intrusion must be identified and sealed. Repairing delamination without fixing the leak is a waste of money — the problem will return.

Prevention

The best delamination prevention is a rigorous roof and seal inspection program. Inspect and reseal all roof penetrations, window frames, door frames, and wall-to-roof seams annually. Silicone and lap sealants degrade over time — don't wait until you see a leak to reseal.

Store your RV with the roof protected from standing water when possible, and address any roof damage immediately.

Mobile Structural Assessment in North Texas

Done Right RV Repair provides mobile delamination assessment and repair throughout North Texas. Our RVTI Master Certified technician can evaluate the extent of delamination, identify the water intrusion source, and recommend the most cost-effective repair approach.

Call us or request service online — we come to your location.