706.3 Materials.Fire walls that separate a building of Type I or II construction from a building of any construction type shall be of any approved noncombustible materials. Other fire walls shall be built of materials consistent with the types permitted for the type of construction of the building.
706.4 Fire-resistance rating.Fire walls shall have a fire-resistance rating of not less than that required by Table 706.4.
Table 706.4
Fire Wall Fire-resistance Ratings
GROUP | FIRE-RESISTANCE RATING (hours) |
A, B, E, H-4, I, R-1, R-2, U | 3a |
F-1, H-3b, H-5, M, S-1 | 3 |
H-1, H-2 | 4b |
F-2, S-2, R-3, R-4 | 2 |
a | In Type II, III, IV, or V construction, walls shall be permitted to have a 2-hour fire-resistance rating. |
b | For Group H-1, H-2, or H-3 buildings, also see Sections 415.7 and 415.8. |
[Statutory Authority: RCW
19.27.031 and
19.27.074. WSR 23-22-115, § 51-50-0706, filed 10/31/23, effective 3/15/24; WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0706, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 20-01-090, § 51-50-0706, filed 12/12/19, effective 7/1/20; WSR 16-03-064, § 51-50-0706, filed 1/19/16, effective 7/1/16.]