Radiant Heat and Wood Floors

Carl,I am in the planning stage of building a new house and would like to install radiant heat in the floors.The lot is a very steep slope (about 25 degrees) and a large portion of the house will becantilevered over the ground level. The floor trusses are two feet tall and spaced on two foot centers.I have just four questions: 1. What type of insulation is appropriate? (For Albuquerque, a few