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ADA Tolerances Provisions

This website is being developed by Evan Terry Associates to try to answer common questions about the proper use of “conventional industry tolerances” as defined by the 2010 ADA Standards. As new technical assistance is released by the U.S. Access Board (or the Department of Justice) on this subject and as questions are answered, we will update this page to reflect the new information. (For your reference, Sections 104.1.1, and 3.2, the relevant sections of the 2010 and 1991 ADA Standards concerning tolerances, are copied below.)

Q1.) When a ramp has a maximum slope of 1:12 or 8.33%, is that considered a range of from 0% to 8.33% which would allow no slope greater than 8.33% or is that a simple maximum which would allow a tolerance above 8.33%? Similarly, is a cabinet countertop that can be no higher than 34” AFF a range of from 0” to 34” AFF with no additional height allowed, or is a tolerance allowed for variations in the floor surface or cabinet construction?

A1.)  The consistent technical assistance on this question has been that both are subject to tolerances.

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