Areoeric
Setting your poles square first is the trick,not sure if your poles are in yet? if not, get some uniform size hardwood stakes and set them in a sq. 24x24. Measure diagonal corners until they are exactly the same.You only move the stake half the distance each time.example:
you have set out a 24x24 but it measures 22x26 when checked diag. move your corner stake in 1' not two. on the 26 side
and so forth until your sq. Run a string around the bottom
a couple of inches up and set your middle poles,(stake)get a can of marker paint and paint the ground following the string.
This will keep you from loosing your ref. while setting the poles.I assume you will use a auger of some type.(know anyone will access to a power line truck with a boom to set poles?) Cut them off on top after they are set. Be sure to check them as you go with the diag. and string this will make it easier with the rest of the building. Another way to keep it sq. that I use is the 3,4,5, method.
Starting in any corner,measure 3' along your string(wall) and mark it,measure 4' along the other (wall) and mark it.
The measurement between the marks should be 5'. You can multiply this out to sq. the whole building 6,8,10, 12,16,20, in your case. I assume you would set 9 poles for a 24x24 this means one in the middle of the floor to set your carrier on.cut off at you desired hieght of bottom of the floor. You will need a transit to set the floor, as well to cut of your tops at a equal height. Mark all the
bottoms where you want your finish floor, I would leave it of the ground at least a foot to the bottom of the stringers.(air flow and crawling in to fix something.)
I would lag bolt (1/4 x6 star head with a big drill works good)a 2x10 around the perimeter on your marks. You can shim with shingles to get your desired dimesion, Do you straightest wall first and measure over to the other and shim if needed. I wouldn't worry to much about getting it perfect,just rip your last floor board to fit.
Hard to do using telephone poles, but it's a barn.
You might consider styrofoam between the floor stringers before decking over. Cut at a slight bevel on a table saw
and press in. Fiberglass insl. could hold moisture that close to the ground. Hope this helps.

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