ClarkDietrich J-Tabbed Track is used at the floor and ceiling in shaftwall assemblies. J-Tabbed Tracks have unequal legs that provide a backstop for easy installation of the liner panel. Three-inch leg track is typically used as a jamb strut around closure details, including duct and door openings, abutments and intersections. The track is punched with fold-up tabs every 12," permitting faster, more efficient installation and eliminates the need for additional screws.