My wife and I pruchased a new home that uses TGI floor joists throughout the house. The problem is that these floors make alot of racket. The worst place in the house is the master bedroom where when I get up and go to the bathroom in the middle of the night I feel like I am going to go through the floor. We asked the builder to repair this, but he said that he does not warranty noisy floors. We have also noticed alot of floor deflection when the floor is loaded. We hired a home inspection who said that there were several problems including the use of too many metal fasterners, a patchwork of subfloor (in some sections the subfloor spans only two joists), no use of bracing sections, etc. We suggested that we hire a structural engineer. We also met with a local jurisdiction building inspector who siad that the code may be violated but again said that you will need a structural engineer. This is getting expensive, the house alone was nearly $800K!. Is there anyplace I can go to get help. The builder is not very cooperative about this situation.