What is the maximum slope permitted for a ramp serving an egress door?

The correct answer is that the maximum slope permitted for a ramp serving an egress door is 1:12. This means that for every inch of vertical rise, there must be at least 12 inches of horizontal distance. This ratio is established to ensure that ramps are accessible and usable by individuals with mobility impairments, providing a manageable gradient that reduces the risk of slipping and falling, and making it easier for people using wheelchairs or other mobility aids to navigate.

By adhering to this maximum slope, builders and inspectors help ensure compliance with accessibility standards, such as those outlined in the Americans with Disabilities Act (ADA). A slope greater than 1:12 would be too steep for safe use, potentially leading to hazards for those who need to rely on ramps for safe egress. Additionally, a more gradual slope would be beneficial in further reducing the effort required to ascend or descend the ramp, promoting greater accessibility for all users.