Americans with Disabilities Act Ramp Slope

ADA slopeThe ADA guidelines provide specific ratios for accessibility ramp measurements that are ensured to optimize safe use. ADA requires that all business and public use ramps adhere to a 1:12 slope ratio, meaning that for every inch of vertical rise there must be 12 horizontal inches (one foot) of ramp. If, for example, you had a stairway with a vertical rise of 21″, you would need 21′ of ramp. Additionally, ADA stipulates that no ramp can run longer than 30 consecutive feet without a rest or turn platform.

Residential ramp applications are not required to follow the commercial code, instead they are suggested to feature a slope up to a 2:12 ratio, or one foot of ramp for every 2 inches of vertical rise.

Why the difference? ADA laws are designed to govern public accommodation rather than private. It is up to the homeowner or property owner to maintain a proper ramp incline for guest access.

Rise is determined by measuring each stair height, in inches, and adding them together. Example: you have three stairs leading to the front door. Each stair measures 7″ in height – that means your rise is 21″.

Ramp Run Length Slope Degree

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