PDFWAC 51-50-0412
Section 412—Aircraft-related occupancies.
412.2.2.1 Stairways. Stairways in airport traffic control towers shall be in accordance with Section 1011. Exit stairways shall be smokeproof enclosures complying with one of the alternatives provided in Section 909.20. Where interior exit stairways and ramps are pressurized in accordance with Section 909.20.5, the smoke control pressurization system shall comply with the requirements specified in Section 909.6.3.
EXCEPTION: | Stairways in airport traffic control towers are not required to comply with Section 1011.12. |
[F] 412.7.3 Means of egress. The means of egress from heliports, helipads and helistops shall comply with the provisions of Chapter 10. Landing areas located on buildings or structures shall have two or more exits or access to exits. For landing areas less than 60 feet in length or less than 2,000 square feet (186 m2) in area, the second means of egress is permitted to be a fire escape, alternating tread device or ladder leading to the floor below. On Group I-2 roofs with heliports or helipads and helistops, rooftop structures enclosing exit stair enclosures or elevator shafts shall be enclosed with fire barriers and opening protectives that match the rating of their respective shaft enclosures below.
[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-0412, filed 11/15/23, effective 3/16/24; WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0412, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 21-06-035, § 51-50-0412, filed 2/23/21, effective 3/26/21; WSR 20-01-090, § 51-50-0412, filed 12/12/19, effective 7/1/20; WSR 16-03-064, § 51-50-0412, filed 1/19/16, effective 7/1/16.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.