I use hooks on the top of the ramp. and loops on the coop. That way I can easily take it off it need be and clean it.
something like these, gives you the idea.
http://www.homedepot.com/p/Lehigh-3-5-8-in-x-3-4-in-Zinc-Plated-Screw-Eye-Hooks-2-Pack-7229S-6/100111333...