Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-11C - State Building Code adoption and amendment of the 2021 edition of the International Energy Conservation Code, Commercial › Section 51-11C-40247 - Section C402.5.9-Vestibules

Current through Register Vol. 24-14, July 15, 2024
C402.5.9
Vestibules.
All building entrances shall be protected with an
			 enclosed vestibule, with all doors opening into and out of the vestibule
			 equipped with self-closing devices. Vestibules shall be designed so that in
			 passing through the vestibule it is not necessary for the interior and exterior
			 doors to open at the same time. The installation of one or more revolving doors
			 in the building entrance shall not eliminate the requirement that a vestibule
			 be provided on any doors adjacent to revolving doors. For the purposes of this
			 section, "building entrances" shall include exit-only doors in buildings where
			 separate doors for entering and exiting are provided.
Interior and exterior doors shall have a minimum distance
				between them of not less than 7 feet. The exterior envelope of conditioned
				vestibules shall comply with the requirements for a conditioned space. Either
				the interior or exterior envelope of unconditioned vestibules shall comply with
				the requirements for a conditioned space. The building lobby is not considered
				a vestibule.
EXCEPTION:
Vestibules are not required for the following:
1. Doors not intended to be used as building
						  entrances.
2. Unfinished ground-level space greater than 3,000
						  square feet (298 m2) if a note is included on the
						  permit documents at each exterior entrance to the space stating "Vestibule
						  required at time of tenant build-out if entrance serves a space greater than
						  3,000 square feet in area."
3. Doors opening directly from a
sleeping
						  unit
or dwelling unit.
4. Doors between an enclosed space smaller than 3,000
						  square feet (298 m2) in area and the exterior of the
						  building or the building entrance lobby, where those doors do not comprise one
						  of the primary building entrance paths to the remainder of the building. The
						  space must be enclosed and separated without transfer air paths from the
						  primary building entrance paths. If there are doors between the space and the
						  primary entrance path, then the doors shall be equipped with self-closing
						  devices so the space acts as a vestibule for the primary building
						  entrance.
5. Revolving doors.
6. Doors used primarily to facilitate vehicular
						  movement or material handling and adjacent personnel doors.
7. In buildings less than 3 stories above grade or in
						  spaces that do not directly connect with the building elevator lobby, doors
						  that have an air curtain with a velocity of not less than 6.56 feet per second
						  (2 m/s) at the floor that have been tested in accordance with ANSI/ AMCA 220
						  and installed in accordance with the manufacturer's instructions. Manual or
						  automatic controls shall be provided that will operate the air curtain with the
						  opening and closing of the door. Air curtains and their controls shall comply
						  with Section C408.2.3.
8. Building entrances in buildings that are less than
						  four stories above grade and less than 10,000 ft2 in
						  area.
9. Elevator doors in parking garages provided that the
						  elevators have an enclosed lobby at each level of the garage.
10. Entrances to semi-heated spaces.
11. Doors that are used only to access outdoor seating
						  areas that are separated from adjacent walking areas by a fence or other
						  barrier.
Statutory Authority:
				  RCW
				    19.27A.020,
				  19.27A.025 and
				  chapters
				  19.27 and
				  34.05 RCW. 13-04-056, §
				  51-11C-40247, filed 2/1/13, effective
				  7/1/13.