 And they're very popular in new construction because they're affordable, they're consistent, they help you put the home together pretty quickly. But what I have found is that even though they meet the requirements for load in terms of how much weight you can put on them, they tend to be more flexible and hence more bouncy than other types of floor systems. So I can tell you that in the years that I was a professional home inspector, when I found one of these houses, especially if it was like the living room or dining room, as I walk across it, I hear everything rattle and know exactly what was going on.