We came home from work last week to find a large hairline crack in our floor tile extending from our garage, through the entryway, pantry, kitchen and beneath the cabinets to the side of the house. Ceramic tile was installed directly over concrete slab. A few weeks back, we heard loud cracking noises coming from the area that we couldn't identify. I suspect now that was the foundation or tile cracking.
Looking back over construction pictures from 2 years ago, we found that a crack in the concrete was present at the framing stage that corresponds to the tile crack. We have a home warranty for the foundation that lasts for 10 years. The builder called this normal expansion and contraction. I see no joints in the poured concrete slab to allow for controlled expansion.
This was to be our retirement home and now we are very concerned about its structural integrity longterm. I'd appreciate any suggestions on how to proceed.