CertainTeed's Vinyl Carpentry™ Wall, Window, Door Transitions offers attractive transitions between styles, architectural elements and colors are the best way to ensure a uniform design on any home. CertainTeed offers a wide variety of wall and soffit transition options for you to create beautiful transitions, while providing protection from damaging moisture. Trim provides a beautiful transition between two styles of siding. On long expanses of board & batten or soffit, a trim piece offers a way to add a signature outline or focal point. Also, consider a trim piece to transition from the wall up to soffit.