What is required when the backing surface is susceptible to water damage?

When the backing surface is susceptible to water damage, utilizing a membrane is critical. Membranes serve as a protective layer between the substrate and the tile installation, helping to prevent moisture penetration that can lead to damage such as mold growth, surface deterioration, and reduced adhesion. The membrane acts as a waterproofing barrier, ensuring that any water that accumulates does not reach the underlying materials that could be compromised.

Proper installation of a membrane is essential in any environment where water exposure is a possibility, such as bathrooms, kitchens, or outdoor spaces. By integrating this protective component into the tiling system, the longevity and durability of both the tile and the backing surface are significantly enhanced.

In contrast, while control joints, vapor barriers, and drainage systems play important roles in other scenarios, they do not directly provide the same level of moisture protection as a membrane does for surfaces specifically susceptible to water damage. Control joints are used to manage expansion and contraction, vapor barriers are more about preventing vapor transmission rather than direct waterproofing, and drainage systems are designed to facilitate water removal rather than prevent its intrusion.