UL™ Listed Rails and Ramps can be essential for handicapped access into, around and within dwellings and commercial & industrial buildings.
In those instances where the ramp has a rise of more than 30 inches, a landing platform should be constructed half way up.
Additional safety requirements include handrails on both sides and a non-slip surface.
Exterior ramps in climates where ice and snow are common should have a more gradual incline preferably 1:20, and the requisite hand rails.
RAILS For HANDICAPPED ACCESS | 
