Bski, when you are planning to clear span the entire 28', remember that when they are being designed to code (L/360 or higher, hopefully) that you could have up to an inch of deflection in the entire span, and still meet code. You may want to reconsider such a long span, so that you have a stiffer floor.
Thanks for the heads-up, bbjr. I'm working with a Georgia Pacific engineer. The product we will use will exceed L/480 with the planned load. I have also nix'd the hot tub and grand piano.
