What would be a safe run /rise for a handicap ramp?
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Standards call for a maximum slope of 1:12, but experts say this is too steep for many people and recommend 1:20 slope.
There should be no lip greater than ½", preferrably less. You'll also need handrails at 33 to 36" in height, with a rail that's easily graspable, a toe-kick or curb 4" high, and a flat landing at every change in direction.
At the doorway there should be at least 18" of level space to the latch side of the door, about 4 to 5 feet of level platform in front of the door. You'll also want to consider slip resistance, lighting, overhang, snow removal, and, of course, appearance.
Taunton's book, Building for a Lifetime, is excellent if you will be doing more than just a ramp.
http://www.access-board.gov/adaag/html/adaag.htm#4.8
http://www.mdausa.org/publications/Quest/q52rampit.html
http://www.students.mines.edu/~jfield/epics/assign/memo5/reg.html
Thanks. This info is a great help.