306.3 Knee Clearance

306.3 Knee Clearance.

Figure 306.3(a) Knee Clearance: Elevation. Knee clearance is 27 inches (685 mm) high minimum above the floor or ground for a minimum depth of 8 inches (205 mm), measured from the leading edge of the element. The vertical clearance decreases beyond this depth to a height of 9 inches (230 mm) minimum at depth of 11 inches (280 mm) minimum measured from the leading edge of the element. Figure 306.3(b) Knee Clearance: Plan. Combined knee and toe clearance can extend 25 inches (635 mm) maximum under an element.

Figure 306.3 Knee Clearance

306.3.1 General.

Space under an element between 9 inches (230 mm) and 27 inches (685 mm) above the finish floor or ground shall be considered knee clearance and shall comply with 306.3.

306.3.2 Maximum Depth.

Knee clearance shall extend 25 inches (635 mm) maximum under an element at 9 inches (230 mm) above the finish floor or ground.

306.3.3 Minimum Required Depth.

Where knee clearance is required under an element as part of a clear floor space, the knee clearance shall be 11 inches (280 mm) deep minimum at 9 inches (230 mm) above the finish floor or ground, and 8 inches (205 mm) deep minimum at 27 inches (685 mm) above the finish floor or ground.

306.3.4 Clearance Reduction.

Between 9 inches (230 mm) and 27 inches (685 mm) above the finish floor or ground, the knee clearance shall be permitted to reduce at a rate of 1 inch (25 mm) in depth for each 6 inches (150 mm) in height.

306.3.5 Width.

Knee clearance shall be 30 inches (760 mm) wide minimum.

Source: 2013 Forest Service Trail Accessibility Guidelines (FSTAG) by USDA Forest Service - published 2013

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2013 Forest Service Trail Accessibility Guidelines (FSTAG)