Katepal Green Roof Black Gable Flashing is installed at the edge of the green roof to prevent water from entering the roof structure. The product features a fixed extension piece that makes installation easier. The flashing is installed in a butt joint, and the extension piece saves time while providing a neat finish as the sheets butt against the extension piece to ensure a seamless join. The ends of the sheets have holes pre-cut at a 45-degree angle to make corner detailing easier.