UFC 3-600-01
26 September 2006
greater. In addition, the combustibility of construction will add to the water
demand for an unsprinklered building. The types of construction weighted values
are as follows:
Type of Construction
Value
Type I
1
Type II
2
Type III
3
Type IV
2
Type V
5
C-1.2.1.3
Number of Stories.
Firefighting is more difficult for multi-story buildings. Furthermore, fire spreads
faster vertically than horizontally. Fire in multi-story buildings is more difficult to
contain and has higher water demands. Consider one-story buildings with high
ceiling heights (6.1 m (20 ft) or greater) multi-story. The weighted values for
number of stories of a facility are as follows:
Number of Stories
Value
Single Story
1
Two or more stories
2
(plus 1 point for each additional floor greater than two floors; maximum 6 points)
C-1.2.1.4
Separation Distances.
The model building codes and NFPA 80A provide that a separation distance of
18.3 m (60 ft) or more does not require protection of exterior wall from exposure.
The codes indicate that a separation distance of 6.1 m (20 ft) or less requires one
hour or more fire resistance construction. Water demand for protecting exposed
facilities increases as separation distance decrease. In addition, exterior
firefighting is hampered as building separation distances are reduced. The
weighted values for the building separation distances are as follows:
Separation Distance
Value
meter (feet)
18.3 (60) or more
1
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