a detailed cross-section of a Welted Drip to External Gutter Detail for a green roofing system. It illustrates how water is managed and how various structural layers integrate at the edge of a building. The system is built upon a solid Concrete Deck, which serves as the primary structural foundation. COMPONENT BREAKDOWN The assembly is organized into three main functional zones: the structural base, the thermal/moisture protection layers, and the green roof system. 1. STRUCTURAL & DRAINAGE BASE