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Dimensional Tolerances in Construction and for Surface Accessibility

Accessible - Changes in Level:
Changes in level up to 1/4" may be vertical and without edge treatment. Changes in level between 1/4" and 1/2" shall be beveled with a slope no greater than 1:2. Changes in level greater than 1/2" shall be accomplished by means of a ramp. The maximum slope of a ramp in new construction shall be no greater than 1;12. Ramps where space limitations prohibit this may have slopes and rises as follows: a slope between 1:10 and 1:12 is allowed for a maximum rise of 6", and a slope between 1:8 and 1:10 is allowed for a maximum rise of 3 inches. A slope greater than 1:8 is not allowed.

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