These photos show a crack in the foundation slab that I discovered when I took up the carpet in my house at Sun City Hilton Head, SC.
Photo 1 shows what happens when concrete foundation slabs crack and water under the slab seeps up through cracks to the wood floor above. Why do concrete foundation slabs crack? Because there's no steel reinforcement in them, and because they're poured on fill dirt that hasn't been properly compacted.
Photo 2 shows the plastic vapor barrier that is supposed to be under the concrete foundation slab, but instead, is sticking out of the top of the slab, causing the crack. Why is the plastic vapor barrier poking out through the top of the slab? shoddy construction.
Photo 3 is a close-up of the plastic vapor barrier sticking through the top of the concrete foundation slab, causing the crack.
Photo 4 is a close-up of the same crack taken from a different spot . The carpet hid this crack. A wood floor might hide it (as long as ground water doesn't come up through it); but, a ceramic tile floor won't hide it; the crack will reflect up through the tile and/or grout, and, voila, you have a crack in your ceramic tile floor.
Many, many Pulte houses at Sun City Hilton Head, SC have cracked foundation slabs, and resulting cracks in ceramic tile floors. SHODDY!
Product or Service Mentioned: Pulte Homes House Construction.