My house is approximately a year and a half old now and I already have a three areas throughout the house with a crack going through multiple tiles. The tiles were laid on top of the concrete slab without any substrate. I'll attach some photos after this post.
So, my question is: what could be causing the cracking? Is it just normal settling of the house? And if I remove/replace the cracked tiles, will that prevent crack from continuing to the adjacent tiles?
There is one area where I recently pulled up some carpet in an adjoining room and had a chance to look at the concrete underneath the tiles and didn't see any cracks; just in the tiles. I'm not sure about the other two areas.
Any help would be appreciated.
In the picture below, this is the first crack to show. It has widened and lengthened over the past few months. At the bottom of the picture, it follows the grout line to the left and then continues through the tile diagonal from the cracked tile in the picture.