Ratio guidelines as recommended by the DDA and DRC: For every inch in step height you need inches of ramp length in the following ratios -
* 1:6 ratio - for assisted wheelchair
* 1:12 ratio - for self propelled wheelchair user on temporary ramp
* 1:15 ratio - for all permanently fixed ramps
1 inch = 25,4 mm Using the above DDA and DRC recommended ratios the minimum recommended ramp lengths are as follows.
For assisted wheelchairs:
* Height of Step
o 1 inch Step – 6 inch Ramp
o 2 inch Step – 1 foot Ramp
o 4 inch Step – 2 foot Ramp
o 6 inch Step – 3 foot Ramp
For self propelled wheelchair user on temporary ramp:
* Height of Step
o 1 inch Step – 1 foot Ramp
o 2 inch Step – 2 foot Ramp
o 4 inch Step – 4 foot Ramp
o 6 inch Step – 6 foot Ramp
For all permanently fixed ramps:
* Height of Step
o 1 inch Step – 1 foot 3 inch Ramp
o 2 inch Step – 2 foot 6 inch Ramp
o 4 inch Step – 5 foot Ramp
o 6 inch Step – 7 foot 6 inch Ramp
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