Often finished floors within wet areas are ensured to be impervious by maintaining the integrity of the system and use materials and finishes suitable for wet areas. But due to structural movements and any possible construction mistakes the wet areas are most likely to leak the water flown over the surface. Anticipating the structural movements particularly at joints, should be considered in the design and selection of waterproofing system. The waterproofing should cover the structural movement, preventing water damage to substrate, adjoining walls, or flooring, thereby providing a secure ‘envelope’ to protect the wet areas.