What is the second approach to maintaining water tightness in a commercial building?

In the context of maintaining water tightness in a commercial building, the rain screen method is indeed a valid approach. A rain screen is a building element that creates a space between the outer wall and the cladding material, allowing for drainage and ventilation. This design helps to manage water infiltration by allowing any water that penetrates the outer layer to escape rather than accumulate against the structural components of the building. It provides a specified air gap that promotes ventilation, reducing moisture buildup and preventing issues such as mold or rot in the wall assembly.

The effectiveness of a rain screen design is particularly significant in environments that experience high levels of precipitation or humidity, as it enhances the overall durability and integrity of the building envelope. It acts as a protective layer over the waterproofing elements and ensures that water does not penetrate the building's internal components, contributing significantly to the building's overall performance in terms of energy efficiency and longevity.