TILE CRACKING, CAUSES & REMEDIES
When inspecting a home, many times we observe cracks in a tile floor or tile that has buckled. What causes the crack or the buckle?
Since ceramic tile is weak in flexure and in tension, any movement in the foundation to which it is attached can cause the tile to be affected, either by buckling or by cracking across the tile or along the grout lines. In areas where the soil supporting a building is plastic, i.e., clay with a Plasticity Index (PI) above 15, special attention should be used when installing tile on a concrete foundation.
When installing tile on a floor that is subject to curvature, the installation of an anti-fracture membrane will greatly reduce the potential for tile cracking or buckling. Although no manufacturer is recommended, one such membrane can be seen at www.sepulveda2.com/catalog_sepulveda/show_product_info...