![]() Specifying a running slope of 7.5% maximum and a cross slope of 1.5% maximum for exterior ramps will accommodate most irregularities or variances due to construction methods or materials according to a study sponsored by the Board (\“Dimensional Tolerances in Construction and for Surface Accessibility\” by David Kent Ballast.) Recommendation: Providing the least possible slope below the 1:12 (8.33%) maximum offers better usability for a wider range of users. Variations in slope, such as grade breaks within runs, can disrupt wheelchair travel. No other changes in level other than the running slope (1:12 max.) and cross slope (1:48 max.) are permitted. The running slope is to be uniform along a run, although slight variations may occur with certain materials such as concrete. It also can be expressed as a percentage, pitch, or in degrees. Slope represents the proportion of vertical rise to horizontal length and is specified in the Standards as a ratio (e.g., 1:12). Portions of accessible routes with running slopes steeper than 5% also must be treated as ramps. ![]() Elevators and, under certain specified conditions, platform lifts, can be used as an alternative. ![]() Ramps and curb ramps are required along accessible routes to span changes in level greater than ½”. This guide explains requirements in the ABA Standards for ramps and curb ramps. Guidance on the International Symbol of AccessibilityĬhapter 10: Recreational Boating FacilitiesĬhapter 10: Swimming Pools, Wading Pools, and Spas Chapter 3: Clear Floor or Ground Space and Turning SpaceĬhapter 6: Washing Machines and Clothes Dryers
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