2009 International Building Code Need to Know by R. Woodson

Author:R. Woodson
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2009-08-10T16:00:00+00:00

CODE UPDATE

An aisle is an unenclosed exit access component that defines and provides a path of egress travel.

CODE UPDATE

A flight is a continuous run of rectangular treads, winders or combination thereof from one landing to another.

that complies with this chapter. If the difference in elevation is 6 inches or less, the ramp must be equipped with either handrails or floor finish materials that contrast with adjacent floor finish materials. The following is a list of exceptions that pertain to the elevation change:

A single step with a maximum riser height of 7 inches is permitted for buildings with occupancies in Groups F, H, R-2, and R-3 and Groups S and U at outside doors not required to be accessible.

A stair with a single riser or with two risers and a tread is permitted at locations not required to be accessible provided that the risers and threads comply with this chapter, have a minimum tread depth of 13 inches, and at least one handrail that complies with this chapter is provided within 30 inches of the centerline of the normal path of exit travel on the stair.

A step is allowed in aisles serving seating that has a difference in elevation less than 12 inches at locations not required to be accessible provided that the risers and treads comply with this chapter and the aisle has a handrail complying with this chapter.

Any change in elevation in a corridor serving non-ambulatory persons in Group I-2 occupancy must be by means of a ramp or sloped walkway. The path of the exit cannot be interrupted by any building element other than a means of egress component as specified in this chapter. Obstructions cannot be placed in the required width of a means of exit except projections that are permitted by this chapter. The required capacity of a means of exit system cannot be diminished along the path of exit travel. You cannot count elevators, escalators, and moving walks as a component of a required means of egress from any other part of the building, except when elevators are used as an accessible means of egress in accordance with this chapter.

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