Thanks for all the information. We are doing 6" because this is an automotive/fabrication shop and we want to be able to install lifts safely.
I will look into having the well rig drill an additional hole while they are there. - I'm guessing that will be $15k or so. Would seem more cost...
We are in the planning stages on a new shop with apartment over it in Bozeman Montana. It gets cold there, periods with -30 nights and highs of -5. We are coming from a house with pole-barn. the pole barn had insulated walls and ceiling (not great) and had radiant in the slab, but the slab was...