FORCING OVERHEAD SECTIONAL DOORS

摘要

Sectional doors are the most common type of overhead door found in commercial buildings and residential garages. They can also be one of the most difficult overhead doors to force when they are designed to meet new standards for wind resistance (photo 1). Sectional doors consist of hinged panels that travel on rollers in guide tracks fastened to the sides of the doorway. Older, conventional sectional doors have wood or sheet metal panels that attach to vertical reinforcing members called "stiles." Stiles give the door panels strength and serve as a fastening point for hinges and rollers. Conventional sectional doors may also have wood 2-inch by 4-inch or steel channel fastened horizontally across the stiles for added strength and wind resistance. Conventional sectional doors, as measured from the outside skin of the panels to the inside of their reinforcing framework, generally have a thickness of less than five inches. This makes it possible to cut completely through these doors with a rotary saw equipped with a 14-inch-diameter blade.