Please post a picture.
And your right to be concerned about not rasing the height of the stoop.
By code that stoop needed to be at least 4" below the threshold.
There's hundreds of post on this site and any other DIY site showing all the damage that's been done to home from this one thing.
Most often when someone sticks carpet over a stoop it's because it was all cracked or falling apart.
Other then a door mat I do not know of any "rubber" flooring that can be used outside.
Last edited by joecaption; 04-24-2012 at 09:55 AM.