NOVELTY - The assembly has a set of rectangular panels (2) arranged in two rows. Each panel is enclosed in an outer supporting frame. The assembly comprises support members (4) i.e. purlin for attaching to the side of each of the panels, where the support members comprise outwardly extending flanges at a lower side for supporting the sides. The support members extend along complete sides of the panels. A fixing unit e.g. snap fit bolt fixes the support members to an underlying another support member (12). One of the rows of the panels is arranged in a shingled manner with another row.    USE - Assembly i.e. integrated panel roof assembly such as photovoltaic panels or cells (BiPV) panel roof assembly, solar panel roof assembly, insulating panel roof assembly, and skylight panel roof assembly (all claimed) for forming a cover on a watertight roofing structure such as shade structures, canopies, car ports, covered car parks, bus stop roofs, train station roofs, awnings, arenas and warehouse of a building. Can also be used for integrating panel to wall of a building.    ADVANTAGE - The assembly comprises rectangular panels that are in a portrait position with a longest edge of panels that is parallel to a slope of a roof, so that the distance between purlins is large, thus reducing the number of purlins that are required, and reducing the purlin material cost and purlin mounting time. The assembly is scaleable and modular, and can be used for small or large installations and does not require an underlying sealed roof. The assembly is easy to install, and comprises few components, and reduces erection time and transportation costs. The assembly is strong, load bearing, and has low transportation cost and installation cost.    DETAILED DESCRIPTION - The panels are photovoltaic panels or cells (BiPV), solar panel, insulating panels and skylight panels. The support member is made of a light structural material such as aluminum, plastic such as glass fiber.    DESCRIPTION OF DRAWING(S) - The drawing shows a top perspective view of arrangement of panels on a sloping rood fixed in a shingled manner.    Panels (2)    Support members (4, 12)