International Building Code 504.1
GENERAL BUILDING HEIGHTS AND AREAS
General. The height permitted by Table 503 shall be
increased in accordance with this section.
Exception: The height of one-story aircraft hangars, aircraft
paint hangars and buildings used for the manufacturing
of aircraft shall not be limited if the building is provided
with an automatic fire-extinguishing system in accordance
with Chapter 9 and is entirely surrounded by public ways or
yards not less in width than one and one-half times the
height of the building.
International Building Code 504.2
Automatic sprinkler system increase. Where a building
is equipped throughout with an approved automatic sprinkler
system in accordance with Section 903.3.1.1, the value
specified in Table 503 for maximum height is increased by 20
feet (6096 mm) and the maximum number of stories is
increased by one. These increases are permitted in addition to
the area increase in accordance with Sections 506.2 and 506.3.
For Group R buildings equipped throughout with an approved
automatic sprinkler system in accordance with Section
903.3.1.2, the value specified in Table 503 for maximum height
is increased by 20 feet (6096 mm) and the maximum number of
stories is increased by one, but shall not exceed 60 feet (18 288
mm) or four stories, respectively.
Exceptions:
1. Fire areas with an occupancy in Group I-2 of Type
IIB, III, IV or V construction.
2. Fire areas with an occupancy in Group H-1, H-2, H-3
or H-5.
3. Fire-resistance rating substitution in accordance with
Table 601, Note e.
International Building Code 504.3
Roof structures. Towers, spires, steeples and other roof
structures shall be constructed of materials consistent with the
required type of construction of the building except where
other construction is permitted by Section 1509.2.1. Such
structures shall not be used for habitation or storage. The structures
shall be unlimited in height if of noncombustible materials
and shall not extend more than 20 feet (6096 mm) above the
allowable height if of combustible materials (see Chapter 15
for additional requirements).
International Building Code TABLE 503
ALLOWABLE HEIGHT AND BUILDING AREAS