Wash. Admin. Code § 51-50-0705
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. |
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.
Wash. Admin. Code § 51-50-0705