As I wanted my character to be able to climb up ladders on my level I found this tutorial which shows how easy it is to create the movement of a character climbing up a ladder to do this I had to create a builder brush that was slightly larger than my created ladder object, and by using ladder volume I got the results I wanted.
Link to video
raven67854. (15 Nov 2009 ). Using Ladders and Jump Pads in the Unreal Development Kit – UDK Tutorial . Available: http://www.youtube.com/watch?v=hhytuNKwQnY. Last accessed 05/04/2013.