08-18-2013 07:37 AM
The Americans with Disabilities Act requires a maximum slope of 1:12 which means 12" of ramp for every 1" of rise. In your case, the ramp would need to be 48 feet long. ADA doesn't apply to residential construction so you can increase the slop but you're still going to need a pretty long ramp. You should also consider who is going to be using the ramp and with what equipment.