What type of sheets provide an excellent base for tile on floors or walls?

Backerboard is specifically designed for use as a substrate in tile applications. It is typically made from cement or a combination of cement and other materials, making it moisture-resistant and providing a stable, durable base for tiling. This is particularly important in areas that are exposed to water, such as bathrooms or kitchens.

The textured surface of backerboard enhances adhesion, ensuring that tiles will stick properly and reducing the likelihood of cracks or delamination over time. It also helps to prevent moisture from seeping through to the surface beneath, which can lead to structural damage and mold growth.

While drywall is not recommended for areas exposed to water, and plywood and OSB may not provide the same level of moisture resistance and durability required for tile installation, backerboard serves the distinct purpose of offering a robust foundation that supports tile applications effectively. It is the industry standard for creating a reliable surface for both floor and wall tile installations.