Gravel Stop
From Roofing, Solar Power, and Spray Foam Insulation Wiki
Gravel Stop
A low profile upward-projecting metal edge flashing with a flange along the roof side, usually formed from sheet or extruded metal. Installed along the perimeter of a roof to provide a continuous finished edge for roofing material. Acts as a bitumen-stop during mop application of hot bitumen along a perimeter edge.