I occasionally run into clients who have cracks in their tile floors due to differential settlement in the foundation.  Where such tile cracks occur over a bending or shrinkage crack in the foundation the foundation cracks often telegraph through the tile finish with seasonal differential settlement in the foundation common in our area.  This type of product uncouples the tile from the supporting structure to reduce this occurrence.  I do not wish to specifically recommend this  or any other product; however, this provider offers a good presentation.  Do a little research and you will find other providers who may have suitable products for your specific needs.