Patent attributes
A roofing system of the present disclosure has a first shingle layer and an overlaid layer a portion of which overlays the first shingle layer. Additionally, the roofing system has a first shingle in the first shingle layer, the first shingle having a first channel and a first protrusion in an upward-facing surface and the channel is contiguous with the protrusion, the channel and the protrusion formed on an interlocking end of the first shingle. Further, the roofing system has a second shingle in the overlaid layer, the second shingle having a second channel and a second protrusion in a downward-facing surface and the second channel is contiguous with the second protrusion such that the first channel is configured for receiving the second protrusion and the second channel is configured for receiving the first protrusion.
