I bought the gutter material from Camping world. It's about 1/2 high and has adhesive on the back. I ran it from the center awning brace to about 8 inches past the end of the awning on either end. It has a very slight slope to it so that it drains. I caulked the spaces between it and the awning. Caulked around the center brace. It works very well, no drips come from under the awning . We are dry in a rainstorm.