Installing tile over wood requires specific precautions because wood expands and contracts with humidity, while tile is static. If the wooden subfloor lacks adequate thickness or proper fastening, the resulting movement can cause cracks in the grout or tiles. Furthermore, tile is not a moisture-friendly interface for wood. Using a decoupling membrane or a suitable cement backer board is standard practice to separate the tile assembly from the wood, providing a stable, crack-isolated surface that protects the tiles from the wood's natural movement.
Ask an ExpertInstallation and Preparation
What are the common risks when installing tile over wooden subfloors?
Common risks with wooden subfloors include moisture-related expansion, lack of rigidity (deflection), and the difference in movement characteristics between wood and mortar. These factors can lead to cracked grout, loose tiles, or bond failure if not properly addressed.