Regular house carpet is good for landings and around the rail where you don't need to get speed but on the actual drop in do what the others said and get some out door carpet and construction fence.
I have carpet on mine and as long as it is steep and not to crappy of a tranny then I like it better. The carpet I have feels a lot more snow like and I still get enough speed. If you can put construction fence over it and it will be money.