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What is the ratio of ramp slope?

1:12 slope ratio (ADA Recommended) means that for every inch of rise, you will need one foot of ramp. As an example, a 12 inch rise would require a 12 foot ramp to achieve a 1:12 ratio.

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To determine the length of ramp for your application, you need to determine the rise. The rise is the vertical measurement between the ground and where the top of the ramp is going to be. Disability Systems recommends a 1:12 slope on most applications. Residential applications can use a 2:12 slope ratio if space is an issue but only if an assistant is present to help push the wheelchair or to help a person walking on the ramp. For commercial public access, a 1:12 ratio is required, check your local codes. 1:12 slope ratio (ADA Recommended) means that for every inch of rise, you will need one foot of ramp. As an example, a 12 inch rise would require a 12 foot ramp to achieve a 1:12 ratio. 2:12 slope ratio means that for every two inches of rise, you would need one foot of ramp. As an example, take the total amount of rise in inches and divide by 2. If you have a 12 inch rise divide by 2 and the resulting number would be 6, this is the length of ramp which is required in feet to achieve a 2:12 ratio. 3:12 slope ratio means that for every three inches of rise you would need one foot of ramp. As an example, take the total amount of rise in inches and divide by 3. If you have a 12 inch rise divide by 3 and the resulting number would be 4, this is the length of ramp which is required in feet to achieve a 3:12 ratio. This slope ratio is only used to move an unoccupied wheelchair, never an occupied wheelchair and should never be used for walking.

NOTE: *** Check Your Local Code to Ensure Compliance

For ADA compliance, any ramp that is used on a rise of 6 inches or more, must have handrails and be 36" wide. Any ADA compliant ramp longer that 30 feet (30 inch rise) must include a resting platform and have guardrails (Baulusters spaced 3.5" - 4" apart) to prevent a child from falling through.Contact Disability Systems, Inc. at 1-877-258-7423 for pre-fabricated ramp information or email at info@disabilitysystems.com

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