Measure door opening width and height in feet and inches. This determines the size of door needed. The rough opening should be the same size as the door.
Measure for sideroom: 3 3/4″ is required on each side for installation of the vertical track for standard torsion spring assembly.
Measure area labeled “headroom” – distance between the top of the door opening (“jamb header”) and the ceiling (or floor joist). 12″ is required for standard torsion spring systems. If you have restricted head room, special hardware is available. Additional head room is required for installation of an automatic garage door opener.
NOTE: If door height extends above the opening, the head room measurement should be adjusted proportionately.
Measure area labeled “backroom” – distance is measured from the garage door opening toward the back wall of the garage. Door height plus 18″ is required. Additional back room may be required for installation of an automatic garage door opener.