It’s a damp protection approach used by many builders in new building or when forming an opening in a cavity or solid external wall, extending a building, or tackling an existing damp problem. A Wellington Boot keeps the wet out and prevents wet soaking upwardly or inwardly – and that’s exactly what the Type LTT Tray does. Simply bed it in position, and the shape protects the opening at ground level, including the reveals and extending into the cavity. Wellington Boot It or