Water ingress

Water ingress is the entry of moisture from outside into the walls, floor, or ceiling of a motorhome or caravan habitation area through worn sealants, damaged seams, cracked windows, or roof-light mountings. It is the biggest single cause of value loss: even a small chronic leak rots the timber frame and delaminates the walls in 2–3 seasons.

Top three sources: perimeter roof seams and cantrails, window frames, and roof-light (skylight) mountings. Signs: musty smell, soft walls when pressed, water marks in lower cupboards, peeling wallpaper at floor level. Early fix: re-bed with Sikaflex 221/512, replace cover strips. Advanced damage means rebuilding the wall and replacing the frame, $3,000–15,000. Run a damp test annually as part of a habitation check.