ADA Ramp Slope Requirements Table of Contents ADA Ramp Slope ADA Ramp Slope Calculator ADA Ramp Landing Requirements Example: ADA Ramp and Platform Project Call (513) 889-2492 ORDER NOW Tracy Mikulec Tracy Mikulec, a seasoned leader in the digital marketing realm, currently serves as the Director of Digital at SixAxis, a pioneering manufacturer of industrial and commercial safety products from renowned brands like SafeRack, ErectaStep, and Upside. With a career spanning over three decades, Tracy has been at the forefront of digital innovation, ecommerce, and technology strategy. Since January 2015, Tracy has been instrumental in shaping the digital landscape at SixAxis, LLC, based in Andrews, South Carolina. His role involves leading digital strategies and overseeing technological advancements for SixAxis and its diverse portfolio of brands. Mar 13, 2018 Estimated reading time: 4 minutes ADA Ramp Slope The ADA ramp slope must be no steeper than 1:12 (1 inch of vertical rise to 12 inches of ramp length.) The Americans with Disabilities Act states that these criteria must be met for any wheelchair ramp used by the public. For example, suppose the vertical rise is 10”. To calculate the ADA-required ramp length, multiply the vertical rise (10”) by 12″. Note: once you calculate the ramp length, it is easiest to round up to the nearest whole foot for planning purposes. Ramp Formula ADA Ramp Slope Calculator To calculate the ramp length, you will first need to measure the vertical rise (in inches) to the threshold – the distance from the ground to the bottom of the door you are trying to reach. Once you know the vertical rise, you can insert that number into the ADA ramp calculator. Go to ADA Ramp Calculator Note: Calculations are made assuming that the ground is completely level. If the ground is not level, learn how to maintain a compliant slope on uneven ground ADA Ramp Landing Requirements The ADA states that there must be an additional resting platform for every additional 30′ of ramp length. If the ramp changes directions at the platform, the platform is required to be 60″ x 60″. If the ramp is straight, the platform must be at least as wide as the ramp and 60″ long. Ramp Length(Inches)Ramp Length(Feet)PlatformsRequired1-360″1-30′0361-720″31-60′1721-1,080″61-90′21,081-1,440″91-120′3 Once you calculate the required ADA ramp length using the ADA ramp slope equation above, you can refer to the table below to see how many platforms you require. Each additional platform will add 60” to the overall length of the ramp system. To calculate the total space the ADA ramp will take up, you must add the required platforms and their corresponding lengths to the required ramp length. The ADA also states that there must be a 5′ x 5′ clearing at both the top and bottom of the ramp so that people in wheelchairs have a place to sit. Typically, people don’t need to purchase a platform for the bottom of the ramp because the ramp sits on a sidewalk or parking lot with enough space. If you do not have a platform or space at the top of the ramp, you will need to purchase a platform that will add 60″ to the overall length that the ADA ramp system will occupy. Example: ADA Ramp and Platform Project Here is a sample project we will walk through to calculate the total length of the ADA ramp and platforms. The facts: I have a school that needs an ADA-compliant ramp. The door is off the ground, and no existing staircase or platform system leads out from the door. The ground is almost flat, but as I move away from the door in the direction the ramp will go, the ground slopes slightly upwards. The calculations: I measure the vertical rise from the ground to the bottom of the door, and it equals 49.75″. To calculate the length of the ramp at the required 1:12 ADA ramp slope, I multiply 49.75″ by 12, which equals 597″ (49.75′). After measuring the slope of the ground, I calculate that I only need 575″ (47.9′) to maintain the 1:12 slope. I will round up to the nearest whole foot (48′) to simplify the calculations. Now I’ll look at the required platforms table above. My ramp falls under the requirements of the second row, so I need to incorporate (1) 60″ x 60″ platform that breaks up the length of the ramp. I also need (1) 60″ x 60″ at the top of the ramp. Determine the ADA ramp layout that will fit your application; if you choose a switchback ramp, you will need at least (1) additional platform. For this example, we will use an L-ramp so that it avoids an existing tree. Below is the ADA ramp layout. In total, the ramp system is 696″ (58′) long. Source: ADA Regulation 405.2 ADARampsTools & Resources How to Measure Wheelchair Ramp Ground Slope Read More » December 19, 2019 Tools & Resources Stair and Walk Surface Glossary of Terms Read More » December 1, 2022
