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System No. CW-S-2053
CWS 2053
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1. Floor Assembly — Min 4-1/2 in. thick steel-reinforced lightweight or normal weight (100-150 pcf) structural concrete. Floor assembly to be
supported at perimeter edges by spandrel beams having a Restrained or Unrestrained Beam Rating of 2 hr. Edge of concrete floor to be max 8 in.
from interior surface of spandrel panel (Item 2A).
2. Curtain Wall Assembly — The curtain wall assembly shall incorporate the following construction features:
A. Spandrel Panels — Min 36 in. high by min 4 in. thick steel-reinforced lightweight or normal weight (100-150 pcf) structural concrete spandrel
panels. Wall may also consist of min 4 in. thick steel-reinforced lightweight or normal weight concrete tilt-up panels with a min 36 in. vertical
separation between window openings. Panels provided with steel dead load anchors welded to steel reinforcing bars embedded in the
concrete for attachment to the steel columns and spandrel beams. Panels also provided with steel lateral anchors or braces. The dead load
anchors, which are located in the linear gap between the concrete floor slab and the spandrel panel or tilt-up panel, are to be spaced max 72
in. OC. The top of the dead load anchor is to be recessed min 1/2 in. from top surface of
B. Framed Window — Metal framed window with nom 1 in. thick (double pane) transparent heat-strengthened glass panels. Sill of window to be
min 6 in. above top of floor.
C. Impaling Pins — No. 12 gauge steel pins, min 1/2 in. longer than thickness of insulation boards (Item 2D), swaged to nom 2 by 2 in. galv steel
base plate. Steel base plates secured to concrete spandrel panel with steel concrete screws or powder-driven steel fasteners. Impaling pins to
be spaced 3 in. from edges of insulation boards (Item 2D) on each side of seams and spaced max 24 in. OC both vertically and horizontally. A
min of two horizontal arrays of impaling pins are required to be located on spandrel panel above top surface of floor.
Reproduced by HILTI, Inc. Courtesy of
Underwriters Laboratories, Inc.
April 08, 2009
F Rating — 2 Hr
T Rating — 1/4 Hr
Linear Opening Width — 8 In. Max
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