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MIL-HDBK-1013/1A
5.6.4.1
Summary.  Table 41 summarizes the maximum penetration delay times
achieved by floor/roof construction in use today.  These times are for the
high-level threat.  It is not practical to attack these barriers at the
low-or medium-level threats.  Concrete floors can provide up to about 45
minutes of delay against the high-level threat whereas concrete roofs only
provide about 35 minutes.  Wood construction provides up to 1.5 minutes
against high- level threats and 1.6 minutes against medium-level threats.
Metal construction can provide up to about 2 minutes of delay for roofs but
up to 15 minutes for floors that use riveted steel gratings.
5.6.4.2.  Low-Security Threat Level.  As noted, it is not practical to attack
roofs/floors with a limited set of hand-held tools.  A more reasonable attack
would be against more vulnerable parts of the facility such as doors,
windows, etc.
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