Back to the Jacuzi issue from last week:
As far as strengthing the joists, he pointed out that my vision sucked. I had thought and previously posted that I had a cantilevered box and the rim joist was attached to a joist that was part of the main house floor system. Turns out there is a triple joist there parallel to the wall and the perpendicular joists that make up the cantilever sit in joist hangers attached to one of the triple joists. We didn't discuss it but I believe his analysis assumed that the triple were well attached to each other. They are not but they will be before I am done. Even so he thought that there would be too much deflection and I should add a 4th joist or angle iron to the triple joist. He didn't feel it had to go span all the way to the support beams but he thought I should go as far as possible to stiffen it up.