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Dimensional Tolerances in Construction and for Surface Accessibility

1.2.4 When local horizontal discontinuities and vertical alignments are measured according to Section 1.1.9 a recommended tolerance is ±1/8 in. (3 mm).

Source: Dimensional Tolerances in Construction and for Surface Accessibility by David Kent Ballast (Architectural Research Consulting) for the U.S. Access Board - published 01/2011

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