GS0061: Building products, namely metal roofing and metal wall panels; metal gutters and metal downspouts; metal roof and wall panel fasteners; metal head, hip and valley closures for use in roofing; metal clips for roofing and wall panels; metal roof and wall trim; metal edge stiffeners for use in roofing; and metal snow guards for roofs
GS0401: Custom manufacturing services for others of metal roofing and wall panels
GS0421: Design and engineering services for others in the field of roofing, design and testing for product safety and/or new products in the field of roofing