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Concrete Industry Tolerances for ADA /ABA Work

ASCC Position Statement #43

Standards issued under the Americans with Disabilities Act (ADA) and the Architectural Barriers Act (ABA) address access walkways and ramps to buildings and sites in new construction and alterations. The running slopes and cross slopes of walkways and ramps are being measured for compliance with these standards months or even years after completion. These evaluations typically do not include consideration of tolerances on slab surface finish—tolerances that the concrete industry has had in place for decades. Also, the measurements include changes in surface profiles caused by factors outside of the control of the concrete contractor, such as movements associated with concrete shrinkage and curling, temperature changes, and soil settlement or heave.

Section 5.8—Surface accessibility, of ACI 117.1R14, “Guide for Tolerance Compatibility in Concrete Construction,” provides this discussion: “‘Americans with Disabilities Act and Architectural Barriers Act Accessibility Guidelines’ (ADA/ABA-AG) states that all dimensions are subject to conventional industry tolerances except where the requirement is stated as a range with specific minimum and maximum end points. Where a requirement is a minimum or a maximum dimension that does not have two specific minimum and maximum end points, tolerances may apply.”

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