depicted in fig1 and 2 in order to provide clearance for the planar portion 22 of the roofing panel 20 extending above the mounting flange 36 in order to secure the roofing panels 20 to the mounting member 30 and thus to the roof structure 12 in the embodiment of fig1 and 2 the mounting flange portion 34 preferably has attachment tabs 42 protruding from its upper or outward edge with the attachment tabs 42 being capable of being bent in opposite directions over the adjacent panel flanges 24 of the adjacent panel portions 22 thus interlockingly securing the adjacent panel flanges 24 in a generally flat engagement with the mounting flange portion 34 and thus also securing or anchoring the roofing panels 20 to the roof structure 12 in the embodiment depicted in fig1 and 2 wherein the panel flanges 24 of the adjacent roofing panels 20 generally flatly engage opposite sides of the same mounting flange portion 34 a seam cover 40 is provided to cover this joint the preferred seam cover 40 has a generally u shaped lateral cross section defined by a pair of legs 46 as shown in fig2 the seam cover 40 is adapted to be resiliently snapped onto.