Any ramp system that is intended for public use must comply with the americans with disabilities act ada.
Ada exterior door landing.
An accessible route with a clear width less than 60 inches 1525 mm shall provide passing spaces at intervals of 200 feet 61 m maximum passing spaces shall be either.
2 the landing length shall be a minimum of 60 in 1525 mm clear.
A exterior hinged doors.
The maximum force for pushing or pulling open a door shall be as follows.
Or an intersection of two walking surfaces providing a t shaped space complying with 304 3 2 where the base and arms of the t shaped.
There are many regulations and calculations that go into designing an ada ramp but the ramp landing size is commonly miscalculated because the door size door swing and ramp approach are often not considered.
4 13 11 door opening force.
4 if a doorway is located at a landing then the area in front of the doorway shall comply with 4 13 6.
Minimum number at least 60 of public entrances must be accessible in new construction in addition to entrances directly serving tenancies parking facilities pedestrian tunnels and elevated walkways.
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.
Landing requirements for all other exterior doors.
This guide explains scoping and technical requirements for accessible entrances doors and gates in the ada standards.
Where the door opens into the stairway of a smokeproof enclosure the landing need not have a length of 5 feet.
3 if ramps change direction at landings the minimum landing size shall be 60 in by 60 in 1525 mm by 1525 mm.
The area adjacent to the landing is graded flush with the landing so no drop off exists between the landing and the grass area eliminating the need for railings.
A space 60 inches 1525 mm minimum by 60 inches 1525 mm minimum.
B interior hinged doors.
Where a door opens over a landing the landing shall be at least as wide as the door and at least 5 feet long.
This allowance provides some design flexibility.
1 fire doors shall have the minimum opening force allowable by the appropriate administrative authority.
A level landing area is provided in front of the entry door so a person can pull the door open.
5 lbf 22 2n c sliding or folding doors.
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.
Step down on the interior and up to two steps down to the landing on the exterior regardless of which way the door swings it can only swing over one step.