Here are some common reasons delamination occurs:
Water: If moisture gets into the space between the outer layer and the substrate, it breaks down the bonds that hold the layers together.
Normal wear and tear: The flexing of the RV structure can cause small stress cracks to appear in the body. If repaired quickly, these cracks don't typically pose a problem. However, if moisture penetrates the cracks, the integrity of the RV's structure can be severely compromised.
Neglect: Just as you would regularly check the oil levels or tire pressure on your vehicle, you need to check the integrity of the RV's structure from time to time.