Self-adhering flashing cap strip and end lap connector cap sheet assemblies include a reinforcing layer encapsulated within self-adhering bitumen. The bottom major surfaces of the flashing cap strips and the connector end lap cap sheets are formed by the self-adhering bitumen and the top major surfaces of the flashing cap strips and the connector end lap cap sheets have lateral edge portions formed by the self-adhering bitumen and a coated central portion that extends between the lateral edge portions. The flashing cap strips are used to interconnect cap sheets at roof surface intersections in the formation of waterproof roofing layers and the connector end lap sheets are used to connect lengths of cap sheets at the job site.