Roofing products, photovoltaic roofing elements and systems using them

A photovoltaic roofing element comprising:

• a roofing product comprising
• a flexible roofing substrate having a top surface, the top surface having one or more granule-coated zones thereon capable of acting as a receptor zone or an exposure zone, each zone being adapted to receive one or more photovoltaic elements, the top surface further comprising a headlap zone and one or more inactive zones adjacent the one or more granule-coated zones and not covered when the photovoltaic roofing element is installed, the one or more inactive zones being coated with granules, the top surface of the flexible roofing substrate in the one or more granule-coated zones is recessed from the top surface of the flexible roofing substrate in the one or more inactive zones;
• and
• an adhesive suitable for securing photovoltaic elements to one or more of the granule-coated zones, the adhesive capable of forming a bond to the granules and the top surface of the flexible roofing substrate and to the bottom surface of the photovoltaic elements,
• with the adhesive disposed in one or more of the granule-coated zones but not in the inactive zones;
• and
• one or more photovoltaic elements disposed on the adhesive in the one or more granule-coated zones of the top surface of the flexible roofing substrate.