Overmolded fenestration building product and method of manufacture

An overmolded building product having a frame and a thin shell base. The frame has a periphery and a first aperture. The frame further has an overmolding adapted to receive a pane, which has an interior side and exterior side in contact with the overmolding. The pane covers the first aperture and transmits light. The thin shell base has an exterior side opposed to a portion of an interior side forming a first cavity. The first cavity selectably receiving a filler. The thin shell has a first distal end of the exterior side which may be selectably positionable adjacent to and securable to a roof member. The roof member defines a second aperture leading to a room in a building. The interior side of the thin shell defines a second cavity adjacent to the pane. The frame is securable to the thin shell base. The frame and thin shell base are molded using a process selected from thermoforming, rotomolding, compression molding, or injection molding.