The sun's heat is absorbed by a roof, heating the roof sheathing and causing the underside of the sheathing and the roof framing to radiate downward toward the attic floor. Applying Prodex Total will result in the heat radiated from the hot roof being reflected back out through the roof. Prodex Total also prevents the heat from the living space below from escaping through the roof -- This translates to a reduction in cooling and heating costs. Roof Insulation - Stop Condensation, Heat and Cold