28x42 double wide
have 1/2 in wafer board with shingles with 1 x3 purlins with metal roof on top
bad ice build up and runs down walls

Water melts the snow, freezes and turns to ice. Only thing to do now is chip it away or wait till a thaw. During the fall, you can put thin heating wires on the roof but with this winter and snow, not sure they would work.