How to Measure for Your New Garage Door
Measure the existing door width & height in feet and inches. This determines the size of the door needed. The finished opening should be the same size as the door or less.
Measure for side room: 3 3/4″ is required on each side for installation of vertical track.
Measure headroom(distance between the top of the door and the ceiling) or first obstruction. 14″ is required for standard headroom track, anything less requires a low headroom track. Also measure floor to ceiling. NOTE: If door height extends above the opening, the headroom measurement should be adjusted proportionately.
Measure the backroom distance – distance is measured from the garage door opening toward the back wall of the garage or first obstruction. Door height plus 18″ is required.