NOVELTY - The roofing product (100) comprises a flexible roofing substrate (110) having a top surface, and an adhesive. The top surface has granule-coated zones (114) that act as a receptor zone or an exposure zone, where each zones are adapted to receive photovoltaic elements. The adhesive is configured for: securing photovoltaic elements to the granule-coated zones; and forming a bond to the granules and the top surface of the flexible roofing substrate and to the bottom surface of the photovoltaic elements. The receptor zone is adapted to receive encapsulated photovoltaic elements.    USE - The roofing product is useful in photovoltaic elements of photovoltaic roofing system and kit (all claimed).    ADVANTAGE - The roofing product provides enhanced adhesion between the photovoltaic element and the flexible roofing substrate thus improving the performance of the roofing system and protecting the roofing substrate from UV-induced damage.    DETAILED DESCRIPTION - The roofing product (100) comprises a flexible roofing substrate (110) having a top surface, and an adhesive. The top surface has granule-coated zones (114) that act as a receptor zone or an exposure zone, where each zones are adapted to receive photovoltaic elements. The adhesive is configured for: securing photovoltaic elements to the granule-coated zones; and forming a bond to the granules and the top surface of the flexible roofing substrate and to the bottom surface of the photovoltaic elements. The receptor zone is adapted to receive encapsulated photovoltaic elements. The flexible roofing substrate is a bituminous roofing membrane and an asphalt shingle. The top surface of the flexible roofing substrate has solar reflective properties. The surfacing of the granule-coated zones or the top surface of the flexible roofing substrate in the area adjacent to the granule-coated zones includes alignment marks. An INDEPENDENT CLAIM is included for a method for installing a photovoltaic roofing system.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic top view of a roofing product.    Roofing product (100)    Flexible roofing substrate (110)    Granule-coated zones (114)    Headlap zone (118)    Fastening zone. (119)