Yes I am going to do radiant floor heat. 40X64X16 is the building size. I ordered the 2700ft Pole barn pex manifold pole barn kit from blueridge. I bought a radiant heat water boiler off craigslist in Chicago. My building has 2X8 skirt board with 1.5" attached to it with a 45 at the top of the foam. I am doing 10mil poly on compacted recycled cement. On that poly I am putting 1.5" extruded poly styrene I found on craigslist used. Then I am putting tghe wire mesh on 2" chairs and tying the pex on that. Then we are pouring 5" of concrete.
Ill post this too but dont hold anyone to my numbers as each bid is their own. My building for materials and labor installed - 40X64X16 with 12X24 porch, full double bubble on roof and walls, wainscotting, 2 14X14 rollup doors, 3 pedestrian doors, and 4 windows, 2X8 skirt boards, 2X6 wall girts - it was just under $30K installed. My concrete with site prep is $10.5K - that is 5" and help installing all the parts I sourced (poly,foam,pex).
There are a few differences vs morton/cleary/fbi/ragland. I have trusses that are 4' on center. They are 2X4 trusses not 2X6 but I have 17 of vs 9. S&L builders uses the cheaper spliced laminated 6X6 poles with treated going about 6' above ground and then regular wood after that. I also have double 2X12s that the trusses sit on. I upgraded to 2X6 (from 2X4) wall girts and 2X8 skirt board (from 2X6) - these are standard on most. The only thing in this price range was getting a Menards it bldg put together. No major dealer could touch this. S&L does not do gutters and does not like to do concrete. My concrete guy is localish.