First off, you don't figure loads by the "square yard".
Secondly, the fact that you're asking a question like this in a public forum, with only half of the information required for anyone to even attempt to give you a proper answer, and in a thread called "Building Inspector Dispute" tells me that you don't have a leg to stand on.
I'm assuming the inspector has questioned your selection of materials/sizes for the proposed construction, and asked you to prove that it's acceptable. As I'm sure you've already found out, he doesn't have to prove that it "doesn't work", but you have to prove that it does. I'd spend a few $$ on having an engineer review the design and seal the calculations, since you'll end up doing that after a few more rounds with your inspector. Better to just do it right now, instead of belaboring the problem and ticking the inspector off (making it more difficult down the road).
Bob