I would use a frame of 2x6 and 2/4 with 3/4 plywood for the ramp
surface, but you can buy portable ramps for around $70.
I've written the required lengths for various slopes below
• 1:12 Slope (Or 8.3%, 5 degree incline)
* 39 foot ramp for 39 inch rise
* The ADA recommended slope for commercial and public access ramps.
* Works for most manual chair users unassisted.
• 1:8 Slope (Or 12.5%, 7 degree incline)
26 foot for 39 inch rise
* Most unassisted manual chair users can use on short ramps.
• 2:12 Slope (Or 16.7%, 9.5 degree incline)
* 19.5 foot ramp for 39 inch rise
* OK for most portable ramps.
* An able assistant required for those unable to power themselves.
OK for strong, unassisted manual chair users.
• 3:12 Slope (Or 25%, 14.5 degree incline)
13
Stability a concern.
* Clearance under scooter at top of ramp needs to be considered.
* Works for lightweight chair/user with strong assistant.
* Works for loading unoccupied power chairs and scooters.
* Only the strongest unassisted manual chair users can use on
short ramps.
Robert Riddle wrote:
>
> I need to build a small ramp from the ground up on to the porch. How
> do I figure out the gradiant? Like the porch is 39 inches off the
> ground, how long should the boards be? Ideally the ramp should be
> cement but I don't know how to do that and it's frankly beyond our
> budget to have a pro do it. So I'm thinking of building a simple 2 by6
> over 2 by 4 ramp and bolting it to the underside of the porch frame.
> Thoughts?
>
> [Non-text portions of this message have been removed]
>
>
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