radiant heat

I put radiant in my 40 x60 shop and love it. Perimeter insulation between the slab and foundation walls is critical this is the biggest heat loss on the slab.I used a product called insul- tarp under the slab. It comes in 12 ft wide rolls and you just roll it out. I took pictures of the loops before the slab was poured for future reference. I also dug out a deeper area for footings for the lift and measured it out so I did not hit any tubing when I put it in. I wish I had a wood boiler instead of oil. Good luck!