SYSTEMS/GLASS AND METAL CURTAIN WALLS
UNACCEPTABLE
Figure 4.1.5 Screw-On Face Mullion
Internal Slide-In Spacer
Figure 4.1.6 shows a schematic of this system in which the interior and exterior metal is separated
by a plastic, slide-in separator. These spacers often consist of extruded PVC and are designed to
transfer the structural loads to the interior framing. The plastic spacer is slid into the framing at the
fabrication shop. This system is common in medium commercial curtain walls. The structural
properties of the plastic material are key to this system.
ACCEPTABLE
Figure 4.1.6 Slide-in-Spacer Mullion
PAGE 4.1-5
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