I am looking for an under-floor-heat insulation. I live in a newer well insulated mobile home. I want to install electric floor heating cable on top of my existing sub-floor in the main living area in my house. I plan to install conventional 12" square floor tile as a finished floor surface. I know that my floor is currently well insulated with fiberglass bats and a thermal barrier under the house. I am looking for a recommended insulation product I can lay on the sub-flooring and under the mortar mix, preferably it will come with an aluminized reflective barrier as well.