Abstract: A cleat for use with a roof blocking unit has an integral leaf spring formed as a bend in a web intermediate its front and rear ends with a front side extending downward from the front end and a rear side extending downward from the rear end. In a coping unit, a diverter component defines a channel and is mounted over the cleat. The channel is disposed at an acute angle relative to the cleat web. In a coping assembly installation, a fluid impermeable membrane is disposed over the top of a roof blocking unit with the cleat mounted over the membrane and the diverter component mounted over the cleat. A pair of coping caps is disposed over the cleat and diverter in an offset arrangement with the channel beneath adjacent coping cap edges. The spring leaf biases the caps with a hook-like flange in engagement with a cleat flange.