ShadowRib™ is a proven performer and a versatile tool to the designer. Structural strength in the ShadowRib™ panel is accomplished without sacrificing appearance or design flexibility. Apply the panel over light-gauge framing, purlins, girts, structural steel and joists. Panels may be secured to the structure from the outside of the building with the ShadowRib™ concealed clip or from inside the building with an expansion fastener. Both are positive fastened methods that create a secure interlock between panel and structure. The fluted face creates distinctive shadow lines.