The Assembly Hall With Fixed Seating
A new 600-seat lecture hall is being designed with fixed seating in rows. The design shows 6 wheelchair spaces, all located in the last row at the rear of the hall, each paired with one companion seat. The accessible route to the spaces runs down the center aisle, which is 42 inches wide and has a slope of 1:10 for the last 20 feet. There is no accessible route to the stage. The sound system includes an assistive listening system with 12 receivers, and the signage at the entrance lists the hall's capacity but not the availability of assistive listening. The designer notes that 6 spaces is "about 1 percent" and that the rear location is the most convenient for staff.
1. Evaluate the number and distribution of wheelchair spaces.
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For assembly areas with fixed seating, the number of wheelchair spaces is set by a table based on seating capacity, not by a rough percentage. At 600 seats the required number is more than 6; the applicable table requires a stepped increase as capacity grows, and 6 spaces is short for a 600-seat hall. The designer's "about 1 percent" is not the standard. Distribution is also wrong: wheelchair spaces must be dispersed across the seating area and must provide lines of sight comparable to those for the general public. Clustering all spaces in the last row concentrates users in the worst sightlines and segregates them. The spaces should be distributed among the seating sections and rows, with at least some in locations with sightlines equivalent to adjacent seats. Each space needs an adjacent companion seat, which the design does provide, and the spaces must be on an accessible route.
2. Assess the center aisle and the route to the stage.
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The center aisle at 42 inches wide is acceptable for an accessible route (36-inch minimum), but the 1:10 slope over the last 20 feet is a problem. A slope steeper than 1:12 in an accessible route is a ramp and must meet ramp requirements: handrails, edge protection, landings, and a maximum 1:12 slope (with limited exceptions). A 1:10 aisle is not a compliant accessible route and is hazardous - wheelchair users and people with mobility impairments cannot safely manage it, and it creates a fall risk for ambulatory users. The aisle should be regraded to 1:12 or flatter, or the accessible seating relocated to a level area served by a compliant route. Separately, no accessible route to the stage means performers and staff who use wheelchairs cannot reach the stage; where a stage is part of the assembly function, an accessible route (ramp or lift) should be provided. The route should connect the seating, the stage, and the accessible entrance.
3. Evaluate the assistive listening and signage.
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An assembly area with an audio amplification system must provide an assistive listening system. The number of receivers is based on the seating capacity; at 600 seats the required receiver count is higher than 12, and the system must include a minimum number of hearing-aid-compatible receivers (a proportion of the total). The system must be maintained and available. Signage is deficient: the international symbol of access for assistive listening must be displayed at the ticket office or entrance indicating the availability of the system, and the hall's capacity sign alone does not satisfy this. The signage should tell users where to obtain receivers. The designer should also confirm the system type (induction loop, FM, or infrared) is appropriate for the space and that the receivers are functional at inspection, not merely specified.