Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-50 - State Building Code adoption and amendment of the 2021 edition of the International Building Code › Section 51-50-0705 - Section 705-Exterior walls

Current through Register Vol. 24-14, July 15, 2024
705.2
Projections.
Cornices
, roof and eave overhangs,
			 projecting floors above, exterior balconies and similar projections extending
			 beyond the
exterior wall
shall conform to the requirements of
			 this section and Section 1405. Exterior egress balconies and exterior
exit stairways
and
ramps
shall comply with
			 Sections 1021 and 1027, respectively. Projections shall not extend any closer
			 to the line used to determine the fire separation distance than shown in Table
			 705.2.
EXCEPTIONS:
1. Buildings on the same lot and considered as portions
						  of one building in accordance with Section 705.3 are not required to comply
						  with this section for projections between the buildings.
2. Projecting floors complying with Section 705.2.4 are
						  not required to comply with the projection limitations of Table 705.2.
705.2.5
Projecting floors.
Where the fire separation distance on a lower
			 floor is greater than the fire separation distance on the floor immediately
			 above, the projecting floor shall have not less than the
fire-resistance rating
as the exterior wall above based on
			 Table 602. The
fire-resistant rating
of the
horizontal
portion shall be continuous to the lower
vertical
wall.
Table 705.5
Fire-Resistance Rating Requirements for Exterior Walls
				Based on Fire Separation Distancea,d,g,j
Fire Separation Distance = X
							 (feet)
Type of
							 Construction
Occupancy Group
							 He
Occupancy Group F-1, M,
							 S-1f
Occupancy Group A, B, E, F-2, I,
							 Ri, S-2,
							 Uh
X [LESS THAN]
							 5b
All
3
2
1
5 [LESS THAN EQUAL TO] X [LESS THAN]
							 10
IA, IVA
3
2
1
Others
2
1
1
10 [LESS THAN EQUAL TO] X [LESS THAN]
							 30
IA, IB, IVA, IVB
2
1
1c
IIB, VB
1
0
0
Others
1
1
1c
X [GREATER THAN EQUAL TO] 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 See Section 706.1.1 for party
				walls.
c Open parking garages complying
				with Section 406 shall not be required to have a fire-resistance rating.
d The fire-resistance rating of an
				exterior wall is determined based upon the fire separation distance of the
				exterior wall and the story in which the wall is located.
e For special requirements for Group H
				occupancies, see Section 415.6.
f For special requirements for Group S
				aircraft hangars, see Section 412.3.1.
g Where Table 705.8 permits nonbearing
				exterior walls with unlimited area of unprotected openings, the required
				fire-resistance rating for the exterior walls is 0 hours.
h For a building containing only a Group
				U occupancy private garage or carport, the exterior wall shall not be required
				to have a fire-resistance rating where the fire separation distance is 5 feet
				(1523 mm) or greater.
i For a Group R-3 building of Type II-B
				or Type V-B construction, the exterior wall shall not be required to have a
				fire-resistance rating where the fire separation distance is 5 feet (1523 mm)
				or greater.
j In a mixed occupancy building
				containing Group R-3 and Group U private garage, the exterior wall
				fire-resistance rating shall be as required for Group R-3.
Table 705.8
Maximum Area of Exterior Wall Openings Based on Fire
				Separation Distance and Degree of Opening
				Protectionl
Fire Separation Distance
							 (feet)
Degree of Opening
							 Protection
Allowable
							 Areaa
0 to less than
							 3b,c,k
Unprotected, Nonsprinklered (UP, NS)
Not Permittedk
Unprotected, Sprinklered (UP,
							 S)i
Not Permittedk
Protected (P)
Not Permittedk
3 to less than
							 5d,e
Unprotected, Nonsprinklered (UP, NS)
Not Permitted
Unprotected, Sprinklered (UP,
							 S)i
15%
Protected (P)
15%
5 to less than
							 10e,f,j
Unprotected, Nonsprinklered (UP, NS)
10%h
Unprotected, Sprinklered (UP,
							 S)i
25%
Protected (P)
25%
10 to less than
							 15e,f,g,j
Unprotected, Nonsprinklered (UP, NS)
15%h
Unprotected, Sprinklered (UP,
							 S)i
45%
Protected (P)
45%
15 to less than
							 20f,g,j
Unprotected, Nonsprinklered (UP, NS)
25%
Unprotected, Sprinklered (UP,
							 S)i
75%
Protected (P)
75%
20 to less than
							 25f,g,j
Unprotected, Nonsprinklered (UP, NS)
45%
Unprotected, Sprinklered (UP,
							 S)i
No Limit
Protected (P)
No Limit
25 to less than
							 30f,g,j
Unprotected, Nonsprinklered (UP, NS)
70%
Unprotected, Sprinklered (UP,
							 S)i
No Limit
Protected (P)
No Limit
30 or greater
Unprotected, Nonsprinklered (UP, NS)
No Limit
Unprotected, Sprinklered (UP,
							 S)i
No Limit
Protected (P)
No Limit
For SI: 1 foot = 304.8 mm.
UP, NS = Unprotected openings in buildings not equipped
				throughout with an automatic sprinkler system in accordance with Section
				903.3.1.1.
UP, S = Unprotected openings in buildings equipped throughout
				with an automatic sprinkler system in accordance with Section 903.3.1.1.
P = Openings protected with an opening protective assembly in
				accordance with Section 705.8.2.
a Values indicated are the
				percentage of the area of the exterior wall, per story.
b For the requirements for fire
				walls of buildings with differing heights, see Section 706.6.1.
c For openings in a fire wall for
				buildings on the same lot, see Section 706.8.
d The maximum percentage of
				unprotected and protected openings shall be 25 percent for Group R-3
				occupancies.
e Unprotected openings shall not be
				permitted for openings with a fire separation distance of less than 15 feet for
				Group H-2 and H-3 occupancies.
f The area of unprotected and protected
				openings shall not be limited for Group R-3 occupancies, with a fire separation
				distance of 5 feet or greater.
g The area of openings in an open
				parking structure with a fire separation distance of 10 feet or greater shall
				not be limited.
h Includes buildings accessory to
				Group R-3.
i Not applicable to Group H-1, H-2,
				and H-3 occupancies.
j The area of openings in a
				building containing only a Group U occupancy private garage or carport with a
				fire separation distance of 5 feet or greater shall not be limited.
k For openings between S-2 parking
				garage and Group R-2 building, see Section 705.3, Exception 2.
l In a mixed occupancy building
				containing Group R-3 and Group U private garage, the maximum area of exterior
				openings shall be as required for Group R-3.