The provisions of Section 504 of IBC are adopted by reference with the following modifications:
1. Revise Section 504.1, excluding the exception, to read:
"504.1 General.
The allowable building height, in feet, and the allowable number of stories above grade plane of a building shall be determined based on the type of construction, occupancy classification and whether there is an automatic sprinkler system installed throughout the building."
2. Delete Section 504.1.1.
3. Delete Section 504.1.2.
4. Revise Section 504.3 to read:
"504.3 Height in feet.
The maximum building height, in feet, of a building shall not exceed the limits specified in Table 504.3.
Exception: Towers, spires, minarets, steeples and other rooftop structures with a footprint not exceeding 25 percent of the ground area of the building on which they are erected shall be constructed of materials consistent with the required type of construction of the building except where other construction is permitted by Section 1510.2.4. Such rooftop structures shall not be used for habitation or storage. The rooftop structures shall not extend more than 60 feet (18.3 m) above the allowable building height where of noncombustible materials and shall not extend more than 20 feet (6096 mm) above the allowable building height where of combustible materials (see Chapter 15 for additional requirements)."
5. Replace Table 504.3 as shown:
TABLE 504.3
ALLOWABLE BUILDING HEIGHT IN FEET ABOVE GRADE PLANE a
ALLOWABLE BUILDING HEIGHT IN FEET ABOVE GRADE PLANE a
OCCUPANCY CLASSIFICATION | TYPE OF CONSTRUCTION | |||||||||
SEE FOOTNOTES | TYPE I | TYPE II | TYPE III | TYPE IV | TYPE V | |||||
A | B | A | B | A | B | HT | A | B | ||
OCCUPANCY CLASSIFICATION | TYPE OF CONSTRUCTION | |||||||||
SEE FOOTNOTES | TYPE I | TYPE II | TYPE III | TYPE IV | TYPE V | |||||
A | B | A | B | A | B | HT | A | B | ||
A, B, E, F, H-4 c, M, S, U | NS b | 80 | 80 | 65 | 30 | 55 | 30 | 65 | 30 | 15 |
S | UL | 150 | 85 | 45 | 70 | 45 | 85 g | 45 | 30 | |
H-1, H-2, H-3, H-5 | NS c, d | 80 | 80 | 65 | 30 | 55 | NP | 65 | NP | NP |
S | UL | |||||||||
I | NS b | 80 | 80 | 65 | 30 | 55 | 30 | 65 | 30 | NP |
S | UL | 150 | 85 | |||||||
R | NS b | 80 | 80 | 65 | 30 | 55 | 30 | 65 | 30 e | 20 |
S13D | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 35 | |
S13R | 55 | 55 | 55 | 45 | 55 | 45 | 55 | 45 f | 35 | |
S | UL | 150 | 85 | 45 | 70 | 45 | 85 g | 45 f | 35 | |
For SI: 1 foot = 304.8 mm.
UL = Unlimited.
NS = Buildings not equipped throughout with an automatic sprinkler system.
S = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1.
S13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2.
S13D = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.3.
a. See Chapters 4 and 5 for specific exceptions to the allowable building height in this table.
b. See Section 903.2 for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies.
c. New Group H occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.5.
d. The NS value is only for use in evaluation of existing buildings in accordance with the Chicago Building Rehabilitation Code.
e. Group R occupancies of Type VA construction shall be allowed to be 40 feet in building height, provided that the finished floor level of the highest occupiable space shall not exceed 30 feet above grade plane.
f. Group R occupancies of Type VA construction equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 shall be allowed to be 55 feet in building height, provided that the finished floor level of the highest occupiable space shall not exceed 40 feet above grade plane.
g. 120 feet for evaluation of buildings constructed or permitted for construction before January 1, 1951, that are equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1.
6. Revise Section 504.4 to read:
"504.4 Number of stories above grade plane.
The maximum number of stories above grade plane of a building shall not exceed the limits specified in Table 504.4."
7. Replace Table 504.4 as shown:
TABLE 504.4
ALLOWABLE NUMBER OF STORIES ABOVE GRADE PLANE a, b
ALLOWABLE NUMBER OF STORIES ABOVE GRADE PLANE a, b
OCCUPANCY CLASSIFICATION
|
SEE NOTES
|
TYPE OF CONSTRUCTION
| ||||||||
TYPE I
|
TYPE II
|
TYPE III
|
TYPE IV
|
TYPE V
| ||||||
A
|
B
|
A
|
B
|
A
|
B
|
HT
|
A
|
B
| ||
OCCUPANCY CLASSIFICATION
|
SEE NOTES
|
TYPE OF CONSTRUCTION
| ||||||||
TYPE I
|
TYPE II
|
TYPE III
|
TYPE IV
|
TYPE V
| ||||||
A
|
B
|
A
|
B
|
A
|
B
|
HT
|
A
|
B
| ||
A-1 | NS | UL | 5 | 3 | 1 | 2 | NP | 2 | 1 | NP |
S-13 | UL | 6 | 4 | 2 | 3 | 1 | 3 | 1 | NP | |
A-2 | NS | UL | 10 | 3 | 1 | 2 | NP | 2 | 1 | NP |
S-13 | UL | 11 | 4 | 2 | 3 | 1 | 3 | 1 | NP | |
A-3 | NS | UL | 10 | 3 | 1 | 2 | NP | 2 | 1 | NP |
S-13 | UL | 11 | 4 | 2 | 3 | 1 | 3 | 1 | NP | |
A-4 | NS | UL | 10 | 3 | 1 | 2 | NP | 2 | 1 | NP |
S-13 | UL | 11 | 4 | 2 | 3 | 1 | 3 | 1 | NP | |
A-5 | NS | UL | UL | UL | UL | 1 | 1 | UL | 1 | 1 |
S-13 | UL | UL | UL | UL | 1 | 1 | UL | 1 | 1 | |
B | NS | UL | 11 | 6 | 1 | 4 | 2 | 5 | 1 | NP |
S-13 | UL | 12 | 7 | 2 | 5 | 3 | 6 | 2 | 1 | |
E-1 | NS | UL | 5 | 3 | 1 | 1 | 1 | 1 | 1 | NP |
S-13 | UL | 6 | 4 | 1 | 2 | 1 | 2 | 1 | NP | |
E-2 | NS | UL | 5 | 3 | 1 | 1 | 1 | 1 | 1 | NP |
S-13 | UL | 6 | 4 | 1 | 2 | 1 | 2 | 1 | NP | |
F-1 | NS | UL | 5 | 4 | 1 | 3 | 2 | 4 | 1 | 1 |
S-13 | UL | 6 | 5 | 2 | 4 | 3 | 5 | 1 | 1 | |
F-2 | NS | UL | 5 | 4 | 1 | 3 | 2 | 4 | 1 | 1 |
S-13 | UL | 6 | 5 | 2 | 4 | 3 | 5 | 1 | 1 | |
H-1 | NS c, d | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | NP |
S-13 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | NP | |
H-2 | NS c, d | UL | 3 | 2 | 1 | 2 | 1 | 1 | NP | NP |
S-13 | UL | 3 | 2 | 1 | 2 | 1 | 1 | NP | NP | |
H-3 | NS c, d | UL | 5 | 3 | 1 | 3 | 2 | 3 | NP | NP |
S-13 | UL | 5 | 3 | 1 | 3 | 2 | 3 | NP | NP | |
H-4 | NS c, d | UL | 5 | 4 | 1 | 3 | 2 | 4 | 1 | NP |
S-13 | UL | 6 | 5 | 1 | 4 | 3 | 5 | 1 | NP | |
H-5 | NS c, d | 4 | 4 | 3 | 1 | 3 | 2 | 3 | NP | NP |
S-13 | 4 | 4 | 3 | 1 | 3 | 2 | 3 | NP | NP | |
I-1, Condition 1 | NS d, e | UL | 9 | 3 | 1 | 2 | 1 | 2 | 1 | NP |
S-13 | UL | 10 | 4 | 2 | 3 | 1 | 3 | 1 | NP | |
I-1, Condition 2 | NS d, e | UL | 4 | 3 | 1 | 1 | NP | 1 | 1 | NP |
S-13 | UL | 5 | 4 | 1 | 1 | NP | 1 | 1 | NP | |
I-2, Condition 1 | NS f | UL | 4 | 3 | 1 | 1 | NP | 1 | 1 | NP |
S-13 | UL | 5 | 4 | 1 | 1 | NP | 1 | 1 | NP | |
I-2, Condition 2 | NS f | UL | 4 | 3 | 1 | 1 | NP | 1 | 1 | NP |
S-13 | UL | 5 | 4 | 1 | 1 | NP | 1 | 1 | NP | |
I-3 | NS d, e | UL | 9 | 2 | 1 | 1 | NP | 1 | 1 | NP |
S-13 | UL | 10 | 3 | 1 | 1 | NP | 1 | 1 | NP | |
I-4 | NS | UL | 9 | 3 | 1 | 1 | NP | 1 | 1 | NP |
S-13 d, g | UL | 10 | 4 | 1 | 2 | NP | 3 | 1 | NP | |
M | NS | UL | 11 | 6 | 1 | 4 | 2 | 5 | 1 | NP |
S-13 | UL | 12 | 7 | 2 | 5 | 3 | 6 | 1 | 1 | |
R-1 h | NS d | UL | 11 | 4 | 1 | 4 | 2 | 4 | 2 | 1 |
S-13R | 4 | 4 | 4 | 2 | 4 | 2 | 4 | 2 | 1 | |
S-13 | UL | 12 | 6 | 2 | 5 | 3 | 5 | 3 | 2 | |
R-2 | NS | UL | 11 | 4 | 1 | 4 | 2 | 4 | 2 | 1 |
S-13R | 4 | 4 | 4 | 2 | 4 | 3 | 4 | 4 | 2 | |
S-13 | UL | 12 | 6 | 2 | 5 | 3 | 5 | 4 | 2 | |
R-3 h | NS | UL | 11 | 4 | 1 | 4 | 2 | 4 | 2 | 1 |
S-13D | 3 | 3 | 3 | 2 | 3 | 2 | 3 | 3 | 2 | |
S-13R | 4 | 4 | 4 | 2 | 4 | 3 | 4 | 4 | 2 | |
S-13 | UL | 12 | 6 | 2 | 5 | 3 | 5 | 4 | 2 | |
R-4 h | NS d | UL | 11 | 4 | 1 | 4 | 2 | 4 | NP | NP |
S-13D | 3 | 3 | 3 | 2 | 3 | 2 | 3 | 3 | 2 | |
S-13R | 4 | 4 | 4 | 2 | 4 | 3 | 4 | 3 | 2 | |
S-13 | UL | 12 | 6 | 2 | 5 | 3 | 5 | 3 | 2 | |
R-5 | NS | UL | 11 | 4 | 1 | 4 | 3 | 4 | 3 | 2 |
S-13D | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | |
S-13R | 4 | 4 | 4 | 3 | 4 | 3 | 4 | 4 | 2 | |
S-13 | UL | 12 | 6 | 3 | 5 | 3 | 5 | 4 | 2 | |
S-1 | NS | UL | 5 | 4 | 1 | 3 | 2 | 5 | 1 | 1 |
S-13 | UL | 6 | 5 | 2 | 4 | 3 | 6 | 1 | 1 | |
S-2 | NS | UL | 5 | 4 | 1 | 3 | 2 | 5 | 1 | 1 |
S-13 | UL | 6 | 5 | 2 | 4 | 3 | 6 | 1 | 1 | |
U | NS | UL | 5 | 4 | 1 | 3 | 2 | 4 | 1 | 1 |
S-13 | UL | 6 | 5 | 1 | 4 | 3 | 5 | 1 | 1 | |
UL = Unlimited.
NP = Not permitted.
NS = Buildings not equipped throughout with an automatic sprinkler system.
S = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1.
S13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2.
S13D = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.3.
a. See Chapters 4 and 5 for specific exceptions to the allowable number of stories above grade plane in this table.
b. See Section 903.2 for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies.
c. New Group H occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.5.
d. The NS value is only for use in evaluation of existing buildings in accordance with the Chicago Building Rehabilitation Code.
e. New Group I-1 and I-3 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies, Condition 1, see Exception 1 of Section 903.2.6.
f. New and existing Group I-2 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6 and the Chicago Minimum Requirements for Existing Buildings.
g. For new Group I-4 occupancies, see Exceptions 2 and 3 of Section 903.2.6.
h. New Group R-1, R-3 and R-4 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.8.
(Amend Coun. J. 7-24-19, p. 3646, §§ 28, 29; Amend Coun. J. 2-19-20, p. 14473, Art. II, § 16; Amend Coun. J. 6-25-21, p. 32180, Art. II, § 5; Amend Coun. J. 1-26-22, p. 43756, Art. II, § 4)