What are the effects of water intrusion on deck joints and seals?

• A. It degrades seal materials, accelerates corrosion, and promotes deterioration at joints and interfaces.
• B. It has no effect on deck joints and seals.
• C. It only affects surface coatings and appearance.
• D. It limits movement but does not deteriorate materials.

Answer: (A)

Water intrusion into deck joints and seals compromises both the waterproofing and the joint’s ability to accommodate movement. Seal materials are designed to stay elastic and adhere to joint faces; when water gets in, those seals deteriorate—cracking, debonding, or losing elasticity—which allows more water to pass through. Moisture also reaches embedded metal components and fasteners, and in environments with chlorides (like de-icing salts), corrosion accelerates. As metal corrodes, it expands and creates stresses at the joint interfaces, leading to cracking, spalling, and further deterioration of the joints and surrounding concrete. The result is increased leakage, reduced joint performance, and progressive damage at the joints and interfaces.