Cracked tiles are usually the result of other underlying issues, mostly likely incorrect installation. However, it could also be due to extreme temperature changes, cracks in the substrate (or surface the tile is laid on), supporting too much weight or something as simple as a heavy item being dropped on them.

How do you stop tiles from cracking?

You should make sure that an anti-fracture membrane has been laid between your tile and the subfloor. Anti-fracture membranes are designed to absorb any cracking energy and disperse it across a larger area of the floors. This keeps all that pressure off of a single tile and prevents cracking.

Can tiles crack on their own?

If the mortar is only adhering some of the tile to the subfloor, or if it isn't completely hardened, the tile can shift and, therefore, crack. ... These joints are there to absorb pressure from shifting tiles. If they are too thin, the tiles won't have enough room to expand and contract, causing cracking.