What factor is essential to consider when using backer board for tile installation?

When using backer board for tile installation, the ability to withstand moisture is a crucial factor. Backer board serves as a substrate that provides a stable surface for tiles while protecting underlying structures from moisture damage, particularly in areas prone to water exposure, such as kitchens and bathrooms.

Moisture-resistant backer boards help prevent the growth of mold and mildew, which can compromise both the integrity of the installation and the health of the occupants. Using a moisture-resistant material greatly enhances the longevity and durability of the tile application, ensuring that it can withstand fluctuations in humidity and moisture levels typically found in residential spaces.

Other factors, while important, do not directly impact the fundamental purpose of backer board as significantly as moisture resistance does. For instance, while cost, ease of installation, and availability are relevant considerations, they do not address the core requirement of protecting against moisture, which makes it the most essential factor in tile applications.