Back3.4.4.4.(2)

ATTRIBUTION:

Functional Statement:

F05

To retard the effects of fire on emergency egress facilities.

F06

To retard the effects of fire on facilities for notification, suppression and emergency response.

Objective:

OS1.5, OS1.5, OS1.2

 

APPLICATION:

Separation from each other of exits within scissors stairs and other contiguous exit stairways.
This applies to exits serving floor areas that are intended for occupancy, including mezzanines as stated in Sentence 3.4.2.2.(1), in buildings described in Sentence 1.3.3.2.(1) of Division A.
This also applies to tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1).

INTENT:

To supersede the requirements of Subsections 3.1.8., 3.1.9. and 3.2.8., and require scissors stairs and other contiguous exit stairways to be separated from each other by smoke-tight fire separations.
This is to limit the probability that fire will spread from one exit to another exit, which could lead to:
  • delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons, and
  • delays or ineffectiveness in fire emergency response operations, which could lead to:
    • delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons, including emergency responders, and
    • the spread of fire to other parts of the building, which could lead to harm to persons.

ATTRIBUTION:

Functional Statement:

F06

To retard the effects of fire on facilities for notification, suppression and emergency response.

Objective:

OP1.2

 

APPLICATION:

Separation from each other of exits within scissors stairs and other contiguous exit stairways.
This applies to exits serving floor areas that are intended for occupancy, including mezzanines as stated in Sentence 3.4.2.2.(1), in buildings described in Sentence 1.3.3.2.(1) of Division A.
This also applies to tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1).

INTENT:

To supersede the requirements of Subsections 3.1.8., 3.1.9. and 3.2.8., and require scissors stairs and other contiguous exit stairways to be separated from each other by smoke-tight fire separations.
This is to limit the probability that fire will spread from one exit to another exit, which could lead to delays or ineffectiveness in fire emergency response operations, which could lead to the further spread of fire, which could lead to damage to the building.