We have completely dug down the cellar by 3 and 1/2 feet. Then we put a vapour barrier and 3 inch insulation which we taped at the seams. Then we put down the salvaged fencing from the back yard to act as strengthener for the cement. On the fence we tied the pex tubing for the radiant head.
Meanwhile on the ceiling we are insulating the pipes. Fanatical insulation is the trick to green building.
The next step is to pour the cement.