I just finished two rooms with hardwood flooring. I was told that the flooring should go perpendicular to the joists. In one room I remembered that. In the other I forgot.
The theory is that there's a tiny bit of flex between the joist that will eventaully cause the flooring to sqeak and maybe bow ever so slightly (but visibly).
I certainly don't plan to rip all the flooring up but I would like to know just hw serious of a mistake did I make.....