A bracket for attaching solar panels to a roof, in the form of an L-foot, as well as devices and assemblies that utilize the L-foot. The L-foot includes a base and a riser extending upward from the base. The base includes a pair of raised stiffeners each extending obliquely upward toward each other from opposites sides of the base and each extending lengthwise along the base. The base can receive threaded roof fasteners that extend perpendicularly through the raised stiffeners and obliquely through the base. Threaded roof fasteners positioned on opposite raised stiffeners can extend through the roof deck toward each other. The L-foot is compatible with rail-based and rail-less solar panel racking systems.