The plumber is going out today to rough in the plumbing and the slab is being poured tomorrow hopefully...however as the plan was revised and we are no longer going with a 'pole building' but a framed structure a few different issues have popped up. Our barn is 30' wide by 36' long. Along the right side (as you face the front) we will have two 10'x12' rooms-an entry room with stairs leading up and a bathroom/laundry room. The rest of the ground level is open.This is where we have some issues. The span from the inner wall of the two rooms to the left wall is 20' more or less,this is too far to have no support for the upper floor so we have a few options: 1. We put in floor trusses-the builder has some 15' trusses he can get cheap but that leaves 5' unsupported...or he can buy some 17' trusses but wouldn't that still leave a few feet unsupported?? 2. Install some posts from slab to ceiling-this was the original plan when it was going to be a pole building. 3. Go BACK to a pole building.IF we do this he needs to know BEFORE the slab is poured. 4. Build a wall 10' in from the left side so the ground level is basically three 10 'sections'-the problem with this is it 'chops' up the barn space... Our thoughts were to simply have posts floor to ceiling spaced evenly even though this would still break up the space it wouldn't be as intrusive as a full wall down the left side and would perhaps be cheaper than floor trusses... Any thoughts,advice or questions???