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In setting priorities for removing barriers, an accessible approach and entrance are first on the list. 1
Paths of Travel to Entrances is one area where there is substantial legal guidance for how to implement the minimum requirements of the Americans with Disabilities Act (ADA). The ADA Accessibility Guidelines (ADAAG)![]() |
| figure a. courtesy of the Institute of Human Centered Design (formerly known as Adaptive Environments) |
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| figure b. courtesy of the Institute of Human Centered Design (formerly known as Adaptive Environments) |
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| courtesy of the Institute of Human Centered Design (formerly known as Adaptive Environments) |
Stairs that are easy to use are also safe stairs. For example, handrails on stairways are an important safety factor for all of us. But for many people, stairs are useless unless they have handrails. Stairways are a necessary evil, second only to bathrooms in incidence of accidents. As we become older, stairways become more and more difficult to use and their design becomes critical. The information in this section applies to both interior and exterior stairs.
Tread and riser designs are extremely important.

courtesy of the Institute of Human Centered Design (formerly known as Adaptive Environments)
Risers in excess of 6-7" are difficult for many people to climb and are dangerous tripping hazards.
Outside risers should have a maximum height of 4". The tread should be wide enough to allow your foot to rest completely on the tread without extending over the edge of the step. Where the total length of a stairway is limited, you can extend tread width by installing a projecting edge, or a nosing on the front of the treads. However, unless you install them properly, nosings can create tripping hazards, especially for people with leg paralysis.
Nosings should be beveled, either by the insertion of a piece of wood or metal that will allow toes to slide up and over or by carpeting to slant the nosing projection.
Open risers (found on many exterior wooden stairs) are a real hazard to most people because of their tripping potential, but you can easily close them off with pieces of wood.
You should install handrails on both sides of your stairways so that anyone who has strength on only one side will have support going up or coming down. If you have a wide stairway or you can't provide handrails on both sides, you may want to install a single handrail in the center of the stairway. This installation allows users to keep the handrail on their strong side. Handrails should also extend beyond the top and the bottom nosings because users need their support to get on and off the last step.
Handrails should be designed so that users can grip the rail between thumb and fingers. This "grasp-ability" or opposition is essential to the safety of users.
Handrails should be mounted approximately 11/2" away from the wall to allow adequate grasping space for knuckles and fingers. They should be mounted to support up to 250 pounds at any point. You can secure a handrail by installing mollybolts through the wallboard or screwing directly into the upright studs behind the wall surface. Handrails made from wood should be properly finished to avoid splinters.