In what case must sloped surfaces be utilized in a means of egress?

Sloped surfaces must be utilized in means of egress for elevation changes of less than 12 inches due to accessibility requirements outlined in building codes, such as the International Building Code (IBC) and the Americans with Disabilities Act (ADA). These codes recognize that changes in elevation can pose barriers to individuals with mobility impairments.

While minimal elevation changes may not seem significant, any rise that is not accompanied by proper accessibility features can create hazards and impede safe and efficient movement through a building. By implementing sloped surfaces, such as ramps, facilities ensure compliance with accessibility standards, allowing all individuals to navigate the space without undue difficulty or risk of injury.

In contrast, the other options suggest smaller elevation thresholds, which do not reflect the established guidelines that require sloped surfaces to accommodate elevations up to 12 inches. Therefore, the correct requirement ensures safety and compliance, facilitating equitable access throughout commercial buildings.