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IDEX - Ch. 6
Means of Egress
35
Art/Design
Professional
05/08/2010

Term
 Define means of egress.
Definition
 Continuous and unobstructed path of vertical and horizontal egress travel from any point in a building or structure to a public way.
Term
 Define exit access.
Definition
 Portion of the means of egress that leads to the entrance of an exit.
Term
 Define exit.
Definition
 Portion of the means of egress that provides a protected path of egress between the exit access and the exit discharge.   (Fully enclosed and protected by fire-resistance rated construction with protected openings)
Term
 Define  exit discharge.
Definition
 Portion of the means of egress between the termination of exit and public way.
Term
 According to the CBC, which part of the means of egress is an exterior exit stairway or ramp?
Definition
 Exit.
Term
 What are 3 factors that determine the 1- or 2-hour rating for an exit?
Definition
 1. building height 2. construction type 3. passageway length
Term
 What must be added to the number of fixed seats in a fixed seating assembly to determine the occupant load?
Definition
 The occupant load of areas where fixed seating is not installed (waiting and wheelchair spaces).
Term
 In the CBC, what type of space requires two exits if > 500 sq. ft. and containing hazardous materials.
Definition
 Laboratory
Term
 What condition will require two exits even if the occupant load is less than indicated in the CBC Table 1015.1 Spaces with One Means of Egress?
Definition
 The common path of egress travel exceeds the limits given in the code:   a. 75 ft. for all but H-1, H-2, H-3 b. 100 ft. for B, F, S if sprinklered
Term
 How many exits are required if the O.L is between 501 - 1000?
Definition
 3
Term
 How many exits are required if the OL > 1000?
Definition
 4
Term
 What is the typical egress width per occupant for a non-sprinklered building (except H and I-2) a. for stairways b. for other egress components?
Definition
 a. 0.3 in. / occupant b. 0.2 in. / occupant
Term
 What is the typical egress width per occupant for in a sprinklered building (except H and I-2) a. for stairways b. for other egress components?
Definition
 a. 0.2 in. / occupant b. 0.15in. / occupant
Term
 If there are multiple means of egress and one means of egress becomes blocked, what is the minimum capacity that the other means of egress must handle?
Definition
 50% of the required total capacity
Term
 What types of door opening mechanism are allowed for egress doors serving hazardous areas or OL >= 50?
Definition
 Pivoted or side-hinged - swing in direction of travel
Term
 How many inches can a fully open door project into the required width of the path of egress?
Definition
 7 inches
Term
 If a building is fully sprinklered, what is the minimum separation distance of exits for a space that requires two exits?
Definition
 1/3 the maximum diagonal dimension (1/2 if not sprinklered)
Term
 What is the minimum clear width for an egress door (except I-2, I-3, R-1 or closets)?
Definition
 32 in.
Term
 What is the maximum width of swinging egress doors?
Definition
 48 in.
Term
 What is the minimum height of an egress door?
Definition
 80 in.
Term
 What is the minimum clear width of an egress door for Group I-2?
Definition
 44 in.
Term
 What is the minimum clear width of an egress door for Group I-3?
Definition
 28 in. (unless accessible)
Term
 Is glass permitted in egress doors?
Definition
 Yes, but it must be wired glass or fire-resistance-rated glazing.
Term
 What is the minimum and maximum size of risers for public stairs?
Definition
 4 in. - 7 in.
Term
 What is the minimum tread for public stairs?
Definition
 11 in.
Term
 What is the maximum riser for residential occupancies or private stairways with OL < 10?
Definition
 7 3/4 in.
Term
 What is the minimum tread for residential occupancies or private stairways with OL < 10?
Definition
 10 in.
Term
 What is the minimum dimension of a stairway landing in the direction of travel?
Definition
 No less than the width of the stair, but need not be more than 48 in.
Term
 When is an intermediate handrail required for a stairway?
Definition
 For stairways wider than 5 ft. (Handrail access must be within 30 in.)
Term
 The top of the handrail must be between what height above the nosing of treads?
Definition
 Between 34 - 38 in.
Term
 How far past the top riser must the handrail extend?
Definition
 At least 12 in.
Term
 How far beyond the bottom riser must the handrail extend?
Definition
 At least the depth of one tread.
Term
 What is the cross-sectional dimension of the gripping portion of the handrail?
Definition
 Between 1 1/4 - 2 in.
Term
 What is the minimum space between the handrail and the wall?
Definition
 1 1/2 in.
Term
 What is a common formula for determining an appropriate riser to tread ratio?
Definition
 2R + T = 25 in.
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