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GENERAL BUILDING HEIGHTS AND AREAS
TABLE 503
ALLOWABLE BUILDING HEIGHTS
AND AREAS°
stories
plane.
Building heightlimitationsin feet above gradeplane.
determined
limitationsStory shown egrade
by thdefniti of "Ai ISO building," per
limitations shown in square feet as
Building area
TYPE OF CONSTRUCTION
TYPE III
TYPE IV
TYPE V
TYPEI
TYPE It
a
HT
A
a
A a
A
a
A
65
56
65
50
40
' HEIGHT(feel UL 160
65
55
STORIES(S)
'
AREA A
® GROUP
11L 5
3
2
3
14,000
2
8,500
3
15,000
2
11,500
1
5,500
S UL
A-1 p UL
15,500
8,500
2
-3
2
_ 1.
11
S �"
3
2
9,500-
3
14,000
9.500
15,000
11,500
6,000
A-2 A UL
I5,500
3
2
3
2
1
UL 11
3
15,500
2
9,500
14,000
9,500
IS 0p0
(I,500
-
6,000
A-3 A UL UL
11
3
2
2
9,500
3
15,000
2
11,500
1
6,000
UL
A 4 S UL UL
A
15,500
9,500
140M
UL
UL
UL
S UL UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
A-5 A UL UL
UL
3
S
3
2
UL 11
5
3
23,000
5
28,500
19,000
36,000
18,000
9,000
® g A UL UL
37,500
2
3
1
1
UL 5
3
26,500
2
14,500
3
23,500
14,500
25,500
18,500
9,500
E p UL UL
11
4
2
3
2
12,000
4
33,500
2
14,000
I
8,500
S UL
FA UL UL
25,000
15,500
19,000
5
3
2
A
S UL 11
5
23,000
28 500
18,000
50,500
21,000
13,000
F-2 UL UL
A
37,500
I
1
NP
S I 1
1
7,000
9,500
7,000
10,500
7,500
NP
H-1 A 21,000 16,500
11,000
2
1
2
I
I
S UL 3
2
1
7,000
9,500
7,000
10,500
7,500
3,000
H-2d A 21,000 16,500
I1,000
2
4
2
1
S UL 6
14,000
17,500
13,000
25,500
10,000
5,000
e
H-3 A UL 60,000
26500
3
5
3
2
7
S �"
5
3 -
17,500
S
28,500
17,500
36,000
18,000
6,500
H 4 A UL UL
37,500
3
3
3
2
4 4
3
37,500
3
23.000
3
28,500
19,000
36,000
18,000
9,000
H-5 A UL UL
9
4
3
4
3
4
18,000
3
10,500
2
4,500
S UL
I-1 UL 55,000
19000
10,000
16,500
I0,000
I
I
NP
p
S UL 4
S
2
11000
12,000
NP
NP
12,000
9,500
NP
1-2 UL UL
15,000
2
2
I
S �'
S
15 000
10,000
2
10,500
7,500
12,000
7,500
5,000
I-3 UL iJL
5
3
2
3
2
13,000
3
25,500
1
I8,500
9,000
g UL
I-4 UL 60,500
26,500
13,000
23,500
4
3
i
A
S UL 11
4
l2 500
1S 500
2
12,500
20,500
14,000
9,00(
® M A UL UL
21,500
4
4
3
2
S UL
4
16,000
4
24,000
16,000
20,500
12,000
7,00(
R I A UL 111
24,000
4
4
3
2
S ULit
4
4
16,000
4
24,000
16,000 '
20,�00
12,000
7,001
R-2 A UL UL
24,000
3
3
S UL 11
UL
UL
UL'
R-3 A UL UL
�
- 4
4
4
4
4
20,500
3
12,000
2
7,00
UL ll
�-
A
24,000
16,000
24,OOD
16,000
3
1
R-4 UL
UL
4
26,000
2
17,500
4
25,500
14,000
9.2
8
S-1 A UL 48.0100
26,000
17 500
3
5
4
2
® UL 11
S
3
26,000
q
39,000
26,000
38,500
21,000
13,1
S-2s•` A UL 79,000
39,000
2
4
2
)
UL 5
4
2
8,500
3
14,000
8•SW
18,000
9,000
5,51
U. A UL 35,500
19,000
For sI: 1 foot = 304.9 mm, 1 square foot = 0.0929 m'.
NP =Not
pemd¢ed.
® A = building area per story, S = stories above grade plane, UL Unlimited,
a. See the following sections for general exceptions to
Table 503:
increase
due to automatic sprinkler system installation.
1. Section 504.2, Allowable building height and story
2. Section 506.2, Allowable building area increase due to street
frontage.
sprinkler system
installation.
3. Section 506.3, Allowable building area increase due to automatic
4. Section 507, Unlimited area buildings.
structures, see Section 406.3.
b. For open parking
c. For private garages, see Section 406.1.
d. See Section 415.5 for )imitations.
2009 INTERNATIONAL BUILDING CODE
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1173055IMNL� y'
SECTION 601
GENERAL
cope. The provisions of this chapter shall control the
ation of buildings as to type of construction.
SECTION 602
CONSTRUCTION CLASSIFICATION
1 General. Buildings and structures erected or to be
led, altered or extended in height or area shall be classified
ae of the five construction types defined in Sections 602.2
ugh 602.5. The building elements shall have a fire-resis-
e rating not less than that specified in Table 601 and exte-
walls shall have afire -resistance rating not less than that
ified in Table 602. Where required to have afire -resistance
ig by Table 601, building elements shall comply with the
icable provisions of Section 703.2. The protection of open-
, ducts and air transfer openings in building elements shall
ie required unless required by other provisions of this code.
602.1.1 Minimum requirements. A building or portion
thereof shall not be required to conform to the details of a
type of construction higher than that type which meets the
minimum requirements based on occupancy even though
certain features of such a building actually conform to a
higher type of construction.
602.2 Types I and II. Types I and II construction are those
types of construction in which the building elements listed in
Table 601 are of noncombustible materials, except as permitted
in Section 603 and elsewhere in this code.
602.3 Type M. Type III construction is that type of construc-
tion in which the exterior walls are of noncombustible materi-
als and the interior building elements are of any material
permitted by this code. Fire -retardant -treated wood framing
complying with Section 2303.2 shall be permitted within exte-
rior wall assemblies of a 2-hour rating or less.
602.4 Type IV. Type IV construction (Heavy Timber, HT) is
that type of construction in which the exterior walls are of
noncombustible materials and the interior building elements
are of solid or laminated wood without concealed spaces. The
TABLE 601
FIRE -RESISTANCE RATING REQUIREMENTS FOR BUILDING ELEMENTS (hours)
TYPE
TYPE II
TYPE III
TYPE IV
TYPE
A
B
Ad
B
Ad
B
HT
Ad
B
BUILDING ELEMENT
Primary structural frame-'
(see Section 202)
3'
2'
1
0
I
0
HT
1
0
Bearing walls
-. Exterior'- 4
3
2
1
0
2
2
2
1
0
Interior
3'
T
1
0
1
0
1 IIHT
1
0
Nonbearing walls and partitions
Exterior
See Table 602
Nonbearing walls and partitions
Interioe
0
0
0
0
0
0
See Section 602.4.6
0
0
Floor construction and secondary
-. members (see Section 202)
2
2
1
0
1
0
HT
1
0
Roof construction and secondary
c members (see Section 202)
11/2b
lb•
1b,`
0`
1b,o
0
HT
Ib,`
0
For SI: 1 foot = 304.8 man.
a. Roof supports: Fire -resistance ratings of primary structural frame and bearing walls are permitted to be reduced by 1 hour where supporting a roof only.
b. Except in Group F-1, H, M and S-1 occupancies, fire protection of structural members shall not be required, including protection of roof framing and decking
` where every part of the roof construction is 20 feet or more above any floor immediately below. Fire -retardant -treated wood members shall be allowed to be used
for such unprotected members.
c. In all occupancies, heavy timber shall be allowed where a I -hour or less fire -resistance rating is required. -
d. An approved automatic sprinkler system in accordance with Section 903.3.1.1 shall be allowed to be substituted for I -hour fire -resistance -rated construction, pro-
vided such system is not otherwise required by other provisions of the code or used for an allowable area increase in accordance with Section 506.3 or an allowable
height increase in accordance with Section 504.2. The t-hour substitution for the fire resistance of exterior walls shall not be permitted.
e. Not less than the fire -resistance rating required by other sections of this code.
'i f. Not less than the fire -resistance rating based on fire separation distance (see Table 602).
9. Not less than the fire -resistance rating as referenced in Section 704.10
vnno udTeoninr,nu n, onu nmir_ nnnme
69
TYPES OF CONSTRUCTION
details of Type IV construction shall comply with the provi-
sions of this section. Fire -retardant -treated wood framing
complying with Section 2303.2 shall be permitted within exte-
rior wall assemblies with a 2-hour rating or less. Minimum
solid sawn nominal dimensions arerequired for structures built
using Type IV construction (HT). For glued -laminated mem-
bers the equivalent net finished width and depths correspond-
ing to the minimum nominal width and depths of solid sawn
lumber are required as specified in Table 602.4.
602.4.1 Columns. Wood columns shall be sawn or glued
laminated and shall not be less than 8 inches (203 min),
nominal, in any dimension where supporting floor loads and
not less than 6 inches (152 mm) nominal in width and not
less than 8 inches (203 mm) nominal in depth where sup-
porting roof and ceiling loads only. Columns shall be con-
tinuous or superimposed and connected in an approved
manner.
602.4.2 Floor framing. Wood beams and girders shall be of
sawn or glued -laminated timber and shall be not less than 6
inches (152 min) nominal in width and not less than 10
inches (254 min) nominal in depth. Framed sawn or
glued -laminated timber arches, which spring from the floor
line and support floor loads, shall be not less than 8 inches
(203 min) nominal in any dimension. Framed timber trusses
supporting floor loads shall have members of not less than 8
inches (203 min) nominal in any dimension.
602.4.3 Roof framing. Wood -frame or glued -laminated
arches for roof construction, which spring from the floor
line or from grade and do not support floor loads, shall have
members not less than 6 inches (152 min) nominal in width
and have not less than 8 inches (203 min) nominal in depth
for the lower half of the height and not less than 6 inches
(152 min) nominal in depth for the upper half. Framed or
glued -laminated arches for roof construction that spring
from the top of walls or wall abutments, framed timber
trusses and other roof framing, which do not support floor
loads, shall have members not less than 4 inches (102 min)
nominal in width and not less than 6 inches (152 min) nomi-
nal in depth. Spaced members shallbe permitted to be com-
posed of two or more pieces not less than 3 inches (76 min)
nominal in thickness where blocked solidly throughout
their intervening spaces or where spaces are tightly closed
by a continuous wood cover plate of not less than 2 inches
(51 min) nominal in thickness secured to the underside of
the members. splice plates shall be notless than 3 inches (76
min) nominal in thickness. Where protected by approved
automatic sprinklers under the roof deck, framing members
shall be not less than 3 inches (76 nun) nominal in width.
TABLE 602
BASED ON FIRE SEPARATION DISTANCEa `
RATING
REQUIREMENTS FOR EXTERIOR WALLS
FIRE -RESISTANCE
SEPARATION DISTANCE = X
OCCUPANCY
GROUP RI
OCCUPANCY
GROUP F-1, M, S-19
OCCUPANCY
GROUP A, B, E, F-2, I, R, S-29, U°
FIRE
B (feet)
TYPE OFCONSTRUCTION
X < 5`
All
3
2
1
�
3
21
i
5 < X <10
Others
2
1
TA,IB
2
1
id
0
105X<30
IIB, VB
1
1
0
I
id
Others
X>_30
All
0
0
0
For SI: 1 foot= 304.8 mm.
a. Load -bearing exterior walls shall also comply with the fire -resistance rating requirements of Table 601.
b. For special requirements for Group U occupancies, see Section 406.1.2.
c. See Section 706.1.1 for party walls.
d. Open parking garages complying with Section 406 shall not be required to have a fire -resistance rating.
e. Thefre-resistance rating of an exteriorwall is determined based upon the fire separation distanceof the exterior wall and the story in which the wall is located.
f. For special requirements for Group H occupancies, see Section 415.3.
g. For special requirements for Group S aircraft hangars, see Section 412.4.1.
TABLE 602.4
WOOD MEMBER SIZE
MINIMUM NOMINAL SOLID SAWN SIZE MINIMUM GLUED -LAMINATED NET SIZE
r, inch Depth, inch
Width, inch Depth,
8 6 314 811
6 10 5 to,
6 8 5 81
6 G
6 6 5
4 6 3
For SI: 1 inch = 25.4 mm.
on
2009 INTERNATIONAL BUILDING CODE®
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