Undertile

Undertile is a term used in tiling to refer to a tile that is installed beneath a primary or visible layer of tiles. This secondary layer is often used to provide a more stable and uniform substrate for the main tiling. In some applications, undertiling is employed to improve the thermal insulation of the floor or wall. It can also be used to create a moisture barrier, protecting the underlying structure from water damage, especially in wet areas like bathrooms and kitchens.

The materials used for undertiling vary depending on the specific requirements of the project. Common undertile materials include cement backer board, specialized underlayment panels, or even a layer of plywood in some older installations. The thickness and type of undertile chosen will influence its performance characteristics. Proper installation of undertile is crucial, as any imperfections or weaknesses in this layer can compromise the integrity and longevity of the entire tiled surface. This typically involves securely fastening the undertile to the subfloor or wall, ensuring a smooth and level surface for the main tiles. Undertiling is an essential component in many professional tiling jobs, contributing to a durable and aesthetically pleasing final result.