Weathertight structures are specialized enclosures designed to prevent the admission of water into the vessel from external environmental sources. Unlike watertight systems, weathertight units are specifically intended for installation above the waterline. They serve as the primary defense for the ship's superstructure, protecting internal spaces from heavy weather while allowing for standard operational access. Designed to prevent water ingress from the exposed side only. Engineered to withstand continuous exposure to rain, spray, and waves.