UFC 4-010-01
8 October 2003
Including change 1, 22 January 2007
The specific requirements below will result in window and skylight systems that provide
for effective hazard mitigation.
B-3.1.1
Windows and Skylights with Laminated Glass Glazing. Windows and
skylights fabricated using laminated glass glazing will be designed in accordance with
the requirements below.
B-3.1.1.1
Glazing. Determine the required thickness of laminated glass and
associated polyvinyl-butyral interlayers in single panes and insulating glass unit (IGU)
windows using Tables B-2 and B-3, respectively for the applicable level of protection,
explosive weight, and standoff distance. Those tables are based on application of
ASTM F 2248, Standard Practice for Specifying an Equivalent 3-Second Duration
Design Loading for Blast Resistant Glazing Fabricated with Laminated Glass and ASTM
E 1300 Standard Practice for Determining Load Resistance of Glass in Buildings., which
result in higher levels of protection than those required in these standards as reflected
in Table 2-1. The following adjustments to the ASTM standards are made to provide
the appropriate performance.
Where the tables indicate "F 2248 / E 1300", determine the glass
thickness using the procedures in ASTM F 2248 and E 1300, respectively based on the
applicable charge weight and standoff distance noted in Tables B-2 and B-3.
Do not use less than 6-mm (1/4-in) nominal laminated glass for any single
pane exterior windows or skylights. The 6-mm (1/4-in) laminated glass consists of two
nominal 3-mm (1/8-in) annealed glass panes bonded together with a minimum of a
0.75-mm (0.030-inch) polyvinyl-butyral (PVB) interlayer. For insulating glass units
(IGU), use 6 mm (1/4 inch) laminated glass for the inboard pane as a minimum.
Note that ASTM F2248 can be used for a limited range of charge weights
and standoffs, including those covered by this standard. For charge weights and
standoffs outside of the range of ASTM F2248 and for glazing alternatives to laminated
glass that provide equivalent levels of protection, refer to the DoD Security Engineering
Facilities Design Manual.
B-3.1.1.2
Frames. Provide window and skylight frames, mullions and sashes of
aluminum or steel. In accordance with ASTM F2248, ensure that the framing members
restrict deflections of edges of the blast resistant glazing they support to 1/160 of the
length of the supported edge at allowable stress levels under the equivalent 3-second
design loading. The equivalent 3-second duration design loading determined using
ASTM F 2248 will be based on the applicable explosive weight at the actual standoff
distance at which the window is sited, but not greater than the conventional construction
standoff distance.
In the case of a punched window, the supported edge length will be taken
as equal to the span of the glass, regardless of any intermediate support connections.
In the case of multi-panel glazing systems, the supported edge length to be considered
B-11
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