What type of mortar is essential for tiling in wet areas, such as bathrooms?

Modified thin-set mortar is essential for tiling in wet areas like bathrooms due to its superior bonding capabilities and resistance to moisture. This type of mortar contains additives that enhance its adhesion to various substrate materials and improve flexibility, which is important in environments that experience temperature fluctuations and potential movement.

The modified aspect also provides water resistance, ensuring that the installed tiles can withstand the high humidity and occasional standing water typically found in wet areas. This function is critical in preventing issues such as tile delamination, which can lead to water damage beneath the tiles or grout lines.

In contrast, while thin-set mortar is suitable for dry environments, it may lack the same level of water and adhesion resistance as modified thin-set. Epoxy mortar, although very strong and waterproof, is often more expensive and complicated to work with, making it less common for standard bathroom applications. Sanded grout, while useful for filling joints between tiles, doesn’t provide the necessary bonding layer for the tiles themselves and is primarily intended for the grout lines once the tiles are installed.