Thanks for the quick replies. I'm not too worried about the house burning, she's having it checked out (I work overseas, so not home for it). This is mostly just a thought that popped into my head (I'd probably go for it, if the house were to burn). I do understand the point load of TF vs the distributed load of SF...and I would certainly have the foundation checked prior to building. Have any of you (or any you know) done this?