curtain wall specification.
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Maximum U-value [_____]. Where, in order to meet the requirements
specified, the proposed panel assembly is thicker than indicated, make
corresponding adjustments in accessories and other work such as door,
window and louver frames, flashing, coping, and trim products at no extra
cost to the Government. Unless otherwise indicated, design for
installation from outside the building. Provide vapor barrier on interior
face of insulation. Seal edges of panels with cores of absorptive material
to prevent entrance of water and allow venting of the core space to outside
air.
2.1.16.1
Metal Facing Panels, Single Thickness
Metal facing panels shall be single thickness. Panel facing shall be [flat
sheet] [textured] [impressed-relief] [_____] type, made of [porcelain
enamel] [aluminum] [bronze] [stainless steel] and, with [backside
stiffeners] [or] [edge flanges] spaced as required to meet flatness
specified. Where indicated, backup panels with [_____].
2.1.16.2
Adhesively Bonded Panels
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NOTE: The same metal should be used on both the
exposed and nonexposed faces of the panels,
particularly in the case of aluminum, in order to
minimize differential thermal expansion between the
faces and thus reduce potential warping or buckling
of the panel.
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Adhesively bonded panels shall be sandwich type, metal faced both sides,
and bonded to form stable and composite unit. Nonexposed face shall be
[galvanized steel] [_____]. Exposed face shall be [porcelain enamel]
[aluminum] [bronze] [stainless steel] [weathering steel] [____] of
thickness indicated, with continuous laminated backing or internal
stiffening ribs or breaks spaced as required to meet flatness specified.
The nonexposed face shall be [galvanized steel] [_____] of the thickness
indicated. Maximum slope of exposed face surface at any point, measured
from nominal plane, shall not exceed the following:
a.
1.0 percent for high reflectivity finish.
b.
1.25 percent for medium reflectivity finish.
c.
1.5 percent for low reflectivity finish.
2.1.16.3
Nonmetallic Panels
a.
Panels shall be glass-faced on the side that will be exposed to
view. Glass shall be spandrel glass with ceramic coating on its
nonweathering surface and [smooth] [_____] finish on the exposed
surface [; backing shall be adhesively bonded to nonweathering
surface]. Backing shall be [_____] and shall include [galvanized
steel] [_____] on surface nearest the building. Color of glass
when viewed from the surface that will be exposed after
installation shall be [_____]. Where indicated, glass panels
shall be backed up with [_____].
SECTION 08900
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