What should be installed over plywood before laying more ceramic tile?

Installing backerboard over plywood before laying ceramic tile is a crucial step in ensuring a stable and durable tile installation. Backerboard, typically made from cement or fiberglass, provides a strong and moisture-resistant surface that helps to minimize movement and flexing. This is particularly important because ceramic tile is rigid, and improper support can lead to cracks and other issues over time.

Backerboard also acts as a barrier against moisture, which is especially valuable in areas prone to dampness, such as kitchens and bathrooms. By using backerboard, you enhance the overall integrity of the floor system, promoting better adhesion for the tile and preventing future problems such as mold growth or tile delamination.

Other materials like underlayment could refer to a layer intended for soundproofing or thermal insulation rather than providing a surface conducive for tile adherence. Particle board, while lightweight and easy to work with, is not recommended for wet areas and lacks the durability necessary for a tile installation. Cement board, while a suitable choice as well, is often considered synonymous with backerboard in many contexts, but is more accurately a specific type of backerboard. Thus, when considering the best practice for tile installation over plywood, backerboard is the optimal solution.