How To Install Metal Siding Panels. Step By Step Directions To Install Flashing For Corrugated Metal Siding. Installing metal wall panels and trim on an exposed fastener panel. Step By Step Metal Siding Installation Instructions That Cover These Panels: Corrugated Metal, R Panel, PBR Panel, 7.2 Panel, Western Rib, U Panel, and Ag Panels. Metal Siding Installation For These Details: Base Trim Corner Trim Door Trim Head Trim Jamb Trim Reglet Trim Screw Placement Window Trim