Soffit is the hard aluminum, wood or vinyl material that covers the underside of a roof's overhangs and provides a finished look. Most soffit comes in long 12-inch-wide strips, and you must cut it into pieces to fit the dimensions of your sub-fascia. Installing soffit on the gable portion of the eaves is no different than installing it on a horizontal overhang, except that you will likely faced
. increased safety concerns because the gable is higher. With the correct tools and supplies, you can install soffit on your gable roof. Get step by step instructions at http://www.ehow.com/how_4617117_install-soffits-gable-roof.html