If you re installing a two car garage door place a reinforcing bar on the top panel to prevent the door from bowing in the center.
How to insstall a garage door.
The door must be level even if the floor isn t so use shims under the section to level it.
Door opening height and width headroom from top of opening to ceiling and back room length of garage.
Center and level the first section after you install the brackets.
Next lower the panel into place and screw the corresponding part of the track to the door frame.
For the headroom you should have about 10 to 12 of space depending on the spring system you re installing.
To hold the level in place tape it to the section.
Be sure the bar is centered on the panel.
Drill pilot holes image 1 and secure the bar with screws.
The rubber gasket on the bottom section will fill the gaps created by an unlevel floor.
Attach hinges to the top of each panel image 2.