After finishing surface heat preservation measures, clean up the ground, make it smooth and flat. Aluminum foil reflective film is then laid flat, and later laying electric film. puting the electrothermal?film upside, and I suggest that the safety distance between the membranes should be 20 centimeter. Then connect wires, parallel connect the electrothermal?film. Do insulating treatment with both ends. after the electrothermal?film installement then cover the waterproof cloth to do waterproofing process. .