RSIC-1 Head of Wall Fire Track Shadowline detail. The RSIC-1 is approved for use in UL Fire resistive Design UL HW-D-0060 and UL HW-D-1011 one and two hour fire rated head of wall designs. These head of wall designs can be used in all U400, V400 and W400 series steel frame wall designs where the RSIC-1 clip is published in the Fire Resistive Design.