Red Seal Tilesetter Practice Exam

What should be done with a subfloor that exceeds standard deflection limits?

1. Ignore it and proceed with installation

2. Reinforce the subfloor or add additional supports

3. Use lighter tiles

4. Install directly without concern

The correct answer is: Reinforce the subfloor or add additional supports

When a subfloor exceeds standard deflection limits, reinforcing the subfloor or adding additional supports is essential to ensure a stable and durable foundation for the tile installation. Excessive deflection can lead to cracking of the tiles, grout deterioration, and other long-term issues associated with floor stability. By reinforcing the subfloor or adding supports, you can effectively reduce the amount of movement and flexing that occurs beneath the tile, ultimately ensuring a more solid and reliable installation. This approach can involve using additional joists, blocking between existing joists, or installing a thicker plywood layer to help distribute weight and provide greater support. Following these procedures not only helps meet required building codes but also enhances the overall longevity of the flooring system. Employing lighter tiles or ignoring the deflection limits altogether does not address the underlying issues and could lead to significant problems post-installation.