UFC 3-310-01
25 May 2005
1-6.1
IBC Section 1604.5 Importance factors. Use Table 1 below to determine
the importance factor for snow load, wind load and seismic load in lieu of Table 1604-5,
"Classification of Buildings and Other Structures for Importance Factors".
TABLE 1
CLASSIFICATION OF BUILDINGS AND OTHER STRUCTURES
FOR IMPORTANCE FACTORS
Seismic
Seismic
Snow
Wind
Occupancy
Use
Nature of Occupancy
Factor
Factor
Factor
Category
IE
Group
IS
IW
Buildings and other structures that represent a low
hazard to human life in the event of failure,
including, but not limited to:
0.87a
I
1.00
0.8
Agricultural facilities
I
Certain temporary facilities
Minor storage facilities
Buildings and other structures except those listed
II
1.00
1.00
1.00
in Categories I, III, IV and V
Buildings and other structures that represent a
substantial hazard to human life or represent
significant economic loss in the event of failure,
including, but not limited to:
Buildings and other structures where more than 300
people congregate in one area
Buildings and other structures with elementary school,
secondary school, or daycare facilities with an occupant
load greater than 250
Buildings and other structures with an occupant load
greater than 500
Health care facilities with an occupant load of 50 or
more resident patients, but not having surgery or
1.25
1.10
1.15
II
III
emergency treatment facilities
Jails and detention facilities
Structures and equipment in power-generating
stations; water treatment facilities that are required for
primary treatment and disinfecting of potable water;
waste water treatment facilities that are required for
primary treatment; and other public utility facilities that
are not included in Categories IV and V
Buildings and other structures not included in
Categories IV and V containing sufficient quantities of
toxic, flammable, or explosive substances to be
dangerous to the public if released
Facilities having high-value equipment, as designated
by the using agency
1-2
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