How does the rough opening of my garage relate to the actual door size?
If you are building a garage, the rough opening should be the same size as the door you wish to put in. The door will be placed on the inside of the opening and weather strip can be used to prevent rain and wind from penetrating any cracks. If you need to order a door for an existing opening, provide your dealer with the exact width and height of the opening as well as how much headroom there is above the opening.