radius as described above the edge attachment functions as a biasing member urging the heating cable upward in fig1 toward the channel first side however this may be reversed and the channel first side may function as a biasing member urging the heating cable downward in fig1 toward the edge attachment in the alternative the biasing member may be a separate resilient member that is inserted in the channel for instance below the cable to urge the cable upward in fig1 toward the channel first side the separate resilient member may comprise a wave form elongated member disposed in the channel adjacent one or both of the channel sides a foam rubber material disposed in the channel adjacent one or both of the channel sides rubber silicone or plastic inserts that extend along the channel sides and or engage one or both of the channel sides or rubber silicone or plastic inserts periodically spaced along the length of the channel sides for instance in openings in one or both of the channel sides the biasing member may be made from a heat conductive material to maximize heat transfer from the cable to the adjacent roof structure the drawings show a relatively simplified construction of the raceway involving less components where one or both of the channel sides is formed to be resiliently deflected or springably moved to allow the heating cable to be removably secured in the channel the first channel side i e the channel side adjacent the roof edge 32 has a roof engagement portion 40 extending therefrom adapted to overlie and be secured to a portion 42 of the roof of the structure adjacent the roof edge 32 as shown in fig1 the roof engagement portion.