Landings should have a 60-inch minimum length of clear space at both the top and bottom. If a ramp longer than 6 feet will be used by ambulatory people as well, a handrail is needed on both sides of the ramp. There should be a distance of 30-34 inches from the floor of the ramp to the top of the handrail. Children will require a lower handrail. The two most common materials used for ramp construction are wood and concrete.
Wood is easier and faster to construct, relatively inexpensive, and can last for years.
All ramps and landings need a nonskid surface and should be designed so water will not accumulate. To do this for concrete ramps the surface must be textured. In Colorado, it may be a good idea to keep snow melt handy to use on ramps and landings during inclement weather. Every ramp must be custom built to conform to the specific site. Chapter 3 of How To Create Interiors for the Disabled 6 provides detailed directions on ramp building.