• Codes
  • Features

    Features Overview

    Go to features
    Reference

    Reference.

    A reliable and up-to-date source of codes.
    Research

    Research.

    Rapidly and efficiently calculate project parameters.
    Collaboration

    Collaboration.

    Get everyone on the same page and streamline code research.
    Workflows
    Architects General Contractor Building Official & Plans Examiner Inspectors Owner Subcontractors Code Consultants
  • Pricing
  • Login
  • Sign Up
Sign Up
Login
  • Code Library
  • Features
  • Pricing
  • About
  • Careers
  • Help
  • Contact
  • Terms
  • Privacy
Sign Up
Upgrade to Premium
Code calculators: Code Calculators automatically generates a detailed list of requirements.
REFERENCE
Amendment Styling
Industry-leading search
Suggested code sections
Code diagrams
RESEARCH
Code calculators
Filter by topic
Code compare
Code sheet exports
COLLABORATION
Team projects
Bookmarks
Comments
START 2 WEEK FREE TRIAL
Have an account? Sign in
// CODE SNIPPET

[BE] 1029.13.2 Stepped Aisles

2017 LA City Fire Code > 10 Means of Egress > 1029 Assembly > 1029.13 Assembly Aisle Walking Surfaces > 1029.13.2 Stepped Aisles
JUMP TO FULL CODE CHAPTER
Aisles with a slope exceeding one unit vertical in eight units horizontal (12.5-percent slope) shall consist of a series of risers and treads that extends across the full width of aisles and complies with Sections 1029.13.2.1 through 1029.13.2.4.

[BE] 1029.13.2.1 Treads

Tread depths shall be not less than 11 inches (279 mm) and shall have dimensional uniformity.

Exception: The tolerance between adjacent treads shall not exceed 3/16 inch (4.8 mm).

[BE] 1029.13.2.2 Risers

Where the gradient of stepped aisles is to be the same as the gradient of adjoining seating areas, the riser height shall be not less than 4 inches (102 mm) nor more than 8 inches (203 mm) and shall be uniform within each flight.

Exceptions:

  1. Riser height nonuniformity shall be limited to the extent necessitated by changes in the gradient of the adjoining seating area to maintain adequate sightlines. Where nonuniformities exceed 3/16 inch (4.8 mm) between adjacent risers, the exact location of such nonuniformities shall be indicated with a distinctive marking stripe on each tread at the nosing or leading edge adjacent to the nonuniform risers. Such stripe shall be not less than 1 inch (25 mm), and not more than 2 inches (51 mm), wide. The edge marking stripe shall be distinctively different from the contrasting marking stripe.
  2. Riser heights not exceeding 9 inches (229 mm) shall be permitted where they are necessitated by the slope of the adjacent seating areas to maintain sightlines.

[BE] 1029.13.2.2.1 Construction Tolerances

The tolerance between adjacent risers on a stepped aisle that were designed to be equal height shall not exceed 3/16 inch (4.8 mm). Where the stepped aisle is designed in accordance with Exception 1 of Section 1029.3.2.2, the stepped aisle shall be constructed so that each riser of unequal height, determined in the direction of descent, is not more than 3/8 inch (9.5 mm) in height different from adjacent risers where stepped aisle treads are less than 22 inches (560 mm) in depth and 3/4 inch (19.1 mm) in height different from adjacent risers where stepped aisle treads are 22 inches (560 mm) or greater in depth.

[BE] 1029.13.2.3 Tread Contrasting Marking Stripe

A contrasting marking stripe shall be provided on each tread at the nosing or leading edge such that the location of each tread is readily apparent when viewed in descent. Such stripe shall be not less than 1 inch (25 mm), and not more than 2 inches (51 mm), wide.

Exception: The contrasting marking stripe is permitted to be omitted where tread surfaces are such that the location of each tread is readily apparent when viewed in descent.

[BE] 1029.13.2.4 Nosing and Profile

Nosing and riser profile shall comply with Sections 1011.5.5 through 1011.5.5.3.

Related Code Sections


1029.13.2 Means of Egress, Stepped Aisles
). Where the gradient of stepped aisles is to be the same as the gradient of adjoining seating areas, the riser ...
Los Angeles Building Code > 10 Means of Egress > 1029 Assembly > 1029.13 Assembly Aisle Walking Surfaces > 1029.13.2 Stepped Aisles
1029.13.2 Means of Egress, Stepped Aisles
). Where the gradient of stepped aisles is to be the same as the gradient of adjoining seating areas, the riser ...
2017 LA City Fire Code > 10 Means of Egress > 1029 Assembly > 1029.13 Assembly Aisle Walking Surfaces > 1029.13.2 Stepped Aisles
1029.14.2 Means of Egress, Stepped Aisles
). Where the gradient of stepped aisles is to be the same as the gradient of adjoining seating areas, the riser ...
Los Angeles Building Code > 10 Means of Egress > 1029 Assembly > 1029.14 Assembly Aisle Walking Surfaces > 1029.14.2 Stepped Aisles
1029.10.2.1 Means of Egress, Stairways and Stepped Aisles in a Straight Run
Transitions where the stairway is a straight run from the stepped aisle shall have a minimum depth of 22 inches (559 mm) where the treads ...
2017 LA City Fire Code > 10 Means of Egress > 1029 Assembly > 1029.10 Transitions > 1029.10.2 Transitions to Stairways That Do Not Maintain Stepped Aisle Riser and Tread Dimensions > 1029.10.2.1 Stairways and Stepped Aisles in a Straight Run
1029.10.2.1 Means of Egress, Stairways and Stepped Aisles in a Straight Run
Transitions where the stairway is a straight run from the stepped aisle shall have a minimum depth of 22 inches (559 mm) where the treads ...
Los Angeles Building Code > 10 Means of Egress > 1029 Assembly > 1029.10 Transitions > 1029.10.2 Transitions to Stairways That Do Not Maintain Stepped Aisle Riser and Tread Dimensions > 1029.10.2.1 Stairways and Stepped Aisles in a Straight Run
Help Contact Us Privacy Terms
Shared projects
Shared projects
Projects provide a dedicated space to collaborate on code research.
Search
Search
Don't miss relevant code. Quickly locate sections across your jurisdiction.
Code Compare
Code Compare
Highlight differences between any two building codes.
Code sheet exports
Code sheet exports
Generate a code sheet that integrates with your drawing set.
Code diagrams
Code diagrams
Unpack the code through illustrations and descriptions.
Code Calculators
Code Calculators
Code calculators automatically generate a detailed list of requirements.
UpCodes Premium
Leverage the most sophisticated code compliance platform.
TRY FREE FOR TWO WEEKS VISIT PRICING
UpCodes Premium
Leverage the full code compliance platform.
START 2 WEEK FREE TRIAL LEARN MORE