A standard double garage door is 7 ft. high by 16 ft. wide. Standard single doors are 7 ft. high by 8 or 9 ft. wide. Because the doors are so large, few home centers and only some garage door stores keep many doors in stock, so expect to order one instead of buying it off the shelf. Garage doors are available in wood, fiberglass and steel. Steel doors, like ours, are light, maintenance-free, affordable, readily available, and have an insulating value as high as R-19.
If you pull the red emergency release rope on your automatic opener and you still can’t lift the garage door, you probably have a broken spring. The counterbalance spring is what lifts the garage door, not the garage door opener. If the spring is broken, the door is dead weight. A garage door can be lifted, but it is going to require some muscle to get it up. It is also important to lift the door evenly so it does not jam in the tracks.