The door we're accessing opens on to a 5 3/4" drop, 46" long step to another 5" (ish) drop. The second drop opens out on to uneven lawn. I figured I could make two seperate identical ramps and hinge them together then shim up or dig out the second lower ramp once I install the ramp and figure out the uneven parts of the lawn.
Something to think about if you're building one of these. The top ramp section must go flush up to the door step but the lower ramp section must be high enough to clear the end of the step, allowing it to line up with the end of the upper ramp.
So, a sheet of 3/4" ply (smooth on one side) cut in to 3 sections. 2 of 48"32" will make the ramps and the other 48x32 will be used for the sides and ends.
Some 2x1" for securing the end & sides
A load of 1 1/4" deck screws
Acrylic deck dust to provide a non slip surface.