Thanks for your response. I'll try to clarify. My concern is that I like the idea of a 30 foot clear span with no supporting beams. However, I'm concerned about meeting snow loads. The frame I'm looking at was raised in 1880 and put on a block foundation. The condition of the timbers are in perfect condition thanks to some additions on the side of the barn that made the walls "interior" walls.

I am looking at adding a second floor to a portion of the frame for a master beadroom / loft.

I'll try to get some pictures this weekend and some better measurements.

Thanks for your insights.