Building Codes Illustrated by Ching Francis D. K.; Winkel Steven R.;

Author:Ching, Francis D. K.; Winkel, Steven R.;
Language: eng
Format: epub
ISBN: 9781119150954
Publisher: Wiley
Published: 2016-03-09T00:00:00+00:00

Elevators, Escalators, and Moving Walks

§ 1003.7 does not permit any of these modes of transportation to be used as components of a means of egress. The only exception is for elevators used as an accessible means of egress per § 1009.4, where they are provided with standby power and also with operation and signal devices per § 2.27 of ASME A17.1.

Design Occupant Load

§ 1004.1 specifies that means-of-egress facilities for a building are to be designed to accommodate the number of occupants as computed in accordance with § 1004.1.2 and Table 1004.1.2. The occupant load is to be based on actual occupant loads when it can be determined, as for the number of seats in a theater, or by using Table 1004.1.2, where occupant-load factors are assigned to determine occupant loads based on use. These factors are based on past history of anticipated occupant loads for various uses. The code does not state requirements regarding rounding. We suggest rounding all fractional calculations up to the next whole number in typical cases.

The floor-area allowances in the table are based not on the actual physical situation within any building but for code purposes, on probabilities and observation. The values are codified so that they can be used uniformly by everyone in determining the exit details; i.e., the number and width of the exit components. They are not intended as design program guidelines. It is not necessary that every office worker have a 100 sf (9.3 m2) office even though the occupant load factor is 100.

Per § 1004.2 occupant loads may be increased beyond those listed in Table 1004.1.2 as long as the means of egress system is sized to accommodate the occupant load. In no case may the occupant load calculated under this provision exceed one occupant per 7 sf (0.65 m2) of occupiable floor area.

Where there are mixed uses in a building, some of which use “gross” floor area calculations per Table 1004.1.2 and others use “net” floor areas, the occupant load factors should be applied consistently, based on the use of the areas. When areas such as toilet rooms are used by both assembly areas (net) and office areas (gross), we recommend that the toilet rooms be treated as a part of the net area occupant load and thus they may be excluded from occupied floor area calculations per the definitions referenced in § 1002. This interpretation should be confirmed with the AHJ.

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