Ada Door Threshold Slope
Changes in level up to 1 4 inch can be vertical and do not need an edge treatment.
Ada door threshold slope. When a ramp is added to provide an accessible entrance the slope of the ramp should be as shallow as possible but not more than 1 12. Maximum threshold height at building entry is 3 4 inch 19 mm for exterior sliding doors and 1 2 inch 13 mm for other types of doors without modification. Doors and gates in series. It is also important to provide handrails whenever the slope is more that 1 20 and the vertical rise is greater than 6 inches a.
Cross slope of ramp runs shall not be steeper than 1 48. Additionally the grade of the threshold may not exceed 2 percent in any direction. Fight infiltration and service calls with the first water rated ada compliant sill. Advisory 405 3 cross slope.
4 5 1 general ground and floor surfaces along accessible routes and in accessible rooms and spaces including floors walks ramps stairs and curb ramps shall be stable firm slip resistant and shall comply with 4 5. 4 5 ground and floor surfaces. In other words the slope of the threshold ramp may not exceed 8 33 percent. As multi family projects are on the rise so are the use of ada compliant door sills.
Thresholds at doorways shall not exceed 3 4 in 19 mm in height for exterior sliding doors or 1 2 in 13 mm for other types of doors. The ada requirements for thresholds are. Accessibility for individuals with disabilities is incredibly important as employers employees patrons and visitors with physical limitations have the right to access key areas of public spaces offices schools restaurants and many other facilities. Cross slope is the slope of the surface perpendicular to the direction of travel.
Changes in level between 1 4 inch and 1 2 inch must have a beveled slope equaling 1 2. A maximum height of 3 4 is permitted for existing or altered thresholds if they have a beveled edge on each side with a slope not steeper than 1 2. Thresholds if provided at a doorway must not exceed 3 4 inch in height for exterior sliding doors or 1 2 inch for other types of doors. While some standard door thresholds particularly modern thresholds are designed to adhere to ada standards this is hardly the norm.
Ada ramp handrails when a handicap ramp has a rise greater than six inches or a horizontal projection greater than 72 inches the ramp must have handrails on both sides. Current ada compliant options may help provide a compliant solution as outlined by the americans with disabilities act but they are also all but guaranteed to leak. Cross slope is measured the same way as slope is measured i e the rise over the run. Raised thresholds and floor level changes at accessible doorways shall be beveled with a slope no greater than 1 2 see 4 5 2.
The ada home page provides access to americans with disabilities act ada.