Final answer:
The slope of a ramp serving an egress door is typically designed to meet accessibility standards. The maximum allowable slope in the United States is 1:12, meaning that for every 12 units of horizontal distance, there should be 1 unit of vertical rise.
Step-by-step explanation:
The slope of a ramp serving an egress door is typically designed to meet accessibility standards.
The slope is usually expressed as a ratio of vertical rise to horizontal run, known as the slope ratio or gradient. In the United States, the maximum allowable slope for an accessible ramp is 1:12, meaning that for every 12 units of horizontal distance, there should be 1 unit of vertical rise.
For example, if the ramp has a total vertical rise of 24 inches, the total horizontal distance should be at least 288 inches (24 * 12). This ensures that the ramp is not too steep and is accessible for individuals with mobility devices.