UFC 4-010-01
8 October 2003
Including change 1, 22 January 2007
B-2.3
Standard 8. Building Overhangs. Avoid building overhangs with
inhabited spaces above them where people could gain access to the area underneath
the overhang. Where such overhangs must be used, incorporate the following
measures into the design for new buildings. Incorporate mitigating measures into
existing buildings to achieve an equivalent level of protection.
B-2.3.1
Parking and Roadway Restrictions. Ensure that there are no roadways
or parking areas under overhangs. In the case of existing buildings, roadways that
cannot be abandoned or relocated may be controlled to ensure vehicles do not park
underneath the overhang.
B-2.3.2
Floors. Ensure that the floors beneath inhabited areas will not fail from
the detonation underneath the overhang of an explosive equivalent to explosive weight
II where there is a controlled perimeter and explosive weight I for an uncontrolled
perimeter. Explosive weights I and II are identified in Table B-1.
B-2.3.3
Superstructure. The progressive collapse provisions of Standard 6, will
include all structural elements within and adjacent to the overhang.
B-2.3.4
Adjacent Building Elements. Ensure that all building elements adjacent
to the overhang area provide the appropriate level of protection to explosive weights I
and II in Table B-1, as applicable, based on the explosive detonating underneath the
overhang.
B-2.4
Standard 9. Exterior Masonry Walls. Unreinforced masonry walls are
prohibited for the exterior walls of new buildings. All external masonry walls must have
vertical and horizontal reinforcement distributed throughout the wall section. The
vertical reinforcement ratio will be at least 0.05%, spaced no more than 1200 mm (4 ft)
with reinforcement within 410 mm (1.3 ft) of the ends of walls. The horizontal
reinforcement ratio must be at least 0.025%, consisting of either joint reinforcement
spaced no more than 410 mm (1.3 ft), or bond beam reinforcement spaced no more
than 1200 mm (4 ft), with reinforcement within 410 mm (1.3 ft) of the top and bottom of
the wall. For existing buildings, implement mitigating measures to provide an equivalent
level of protection.
B-3
ARCHITECTURAL DESIGN. Even where the conventional construction
standoff distances are achieved, many aspects of building layout and other architectural
design issues must be incorporated into designs to improve overall protection of
personnel inside buildings.
B-3.1
Standard 10. Windows and Skylights. To minimize hazards from flying
glass fragments from windows and skylights, apply the following provisions for glazing,
framing, connections, and supporting structural elements for all new and existing
inhabited buildings covered by these standards. These provisions apply even if the
conventional construction standoff distances are met or exceeded. These provisions
only address minimum standards (very low and low levels of protection.) For higher
levels of protection, refer to the DoD Security Engineering Facilities Design Manual.
B-10
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