RV lamination is the outer covering that helps protect against weathering and damage. Delamination typically begins as small cracks in the RV's lamination. These cracks spread outward, resulting in the outer layer of fiberglass or gel coat separating from the substrate inner layer of lauan or plywood and Styrofoam underneath. It's a common issue faced by owners of aging RVs that have damage or bad seals, and generally won't be covered by RV insurance.