What is the maximum height of front metal thresholds of entry doors according to disabled-access regulations?

The maximum height of front metal thresholds of entry doors according to disabled-access regulations is 1/2 inch. This requirement is established to ensure accessibility for individuals with disabilities, particularly those who use wheelchairs or mobility aids. A threshold that exceeds this height could create an obstacle, making it difficult for someone with mobility challenges to enter or exit a building safely.

Regulations like the Americans with Disabilities Act (ADA) specify that thresholds must be low enough to allow smooth transition without hindrance. A threshold height of 1/2 inch strikes a balance between durability and accessibility, facilitating compliance with accessibility standards. The goal is to create barrier-free environments that accommodate all individuals, thus supporting inclusivity and ease of access.

Other heights, such as 1/4 inch or 3/4 inch, do not align with the standard for accessibility as effectively. A threshold that is too low might not provide enough protection against water or debris, while one that is too high poses a risk of obstruction. Hence, the 1/2 inch specification effectively meets both accessibility needs and practical building concerns.