Looking at houses in my area, and there is a house for sale with a 'slab on builders pier' foundation. What on earth does that mean? I googled it, but it seems that nearly all of the search results are from housing in Texas. Anyone familiar with this kind of stuff? The house is on top of a hill, slight downward grade in backyard. I'm sure it has something to do with that... but would like more info. I can't seem to find anything on the internet about it though.