UFC 4-022-01
25 May 2005
Table 6-2 Thickness of Common Materials for Resistance Against UL 752 Level III
Wall Material
Wall Thickness
Concrete Masonry (Grouted)
6 in (152 mm)*
Brick
6 in (152 mm)*
Reinforced Concrete (3000 psi)
4 in (102 mm)
Steel Plate (mild)
9/16 in (14.3 mm)
Steel Plate (armor)
7/16 in (11.1 mm)
*Nominal thickness (Reference TM5-853-2)
AF
Table 6-3 Thickness of Common Materials for Resistance Against UL 752 Level V
Wall Material
Wall Thickness
Concrete Masonry (Grouted)
4 in (102 mm)*
Brick
4 in (102 mm)*
Reinforced Concrete (3000 psi)
2.5 in (63.5 mm)
Steel Plate (mild)
5/16 in (8 mm)
Steel Plate (armor)
1/4 in (6 mm)
*Nominal thickness (Reference TM5-853-2)
Some mechanical equipment installed in the exterior envelope of a guard facility may
not be capable of providing sufficient ballistic resistance. Therefore, locate the
equipment to minimize potential exposure to projectile penetration or provide ballistic
hardened equipment and/or louvers. As an example, it may be prudent to install the
HVAC equipment on the roof of the gatehouse or sentry booth to reduce penetrations in
the walls. Provide roof ballistic protection only where there are sightlines to the roof.
6-9.6.3 Windows and Glazing
Provide limited view window glazing. Glazing should limit viewing into the facility to the
extent possible without restricting views out of the facility during day and night
operations. The intent is to reduce the visible signature of security personnel, as seen
from the outside of the gatehouse, without reducing the ability of security personnel to
see out. The IESNA HB-9 suggests specular-reflecting, low transmission glazing at a
tilted angle can be used in the windows to limit view into the guard facilities from the
exterior.
See paragraph 6-9.6.2 for ballistic resistance requirements. Any windows provided in
the overwatch positions should not interfere with the capability to respond to an attack.
Therefore, any windows should be capable of being fully opened/removed quickly or
have a substantial gun port to enable unobstructed line of fire from the position. Without
these capabilities the overwatch positions should have no windows in the exterior wall
openings. If ballistic resistant glazing is maintained for some portion or all of an
opening, consider the visibility through the glazing after it has been impacted during an
attack. Some ballistic resistant glazing materials provide better visibility characteristics
after impact than others.
6-29
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