The height of the rough opening would be the height of the garage door plus the thickness of whatever you are putting underneath the header in addition to the thickness of the mortar etc.
How tall is a garage door opening.
For an approximately 12 x 22 detached garage or one attached to your house the most common width is 8 or 9 feet.
If you have a large enough opening or you re building a new home you have the option to get a double garage door.
For example in areas where golf cart transportation is popular garage doors are usually available to suit these small vehicles.
The standard measurements are 12 x 7 14 x 7 and 16 x 7.
As for the height it is 7 or 8 feet.
It should be obvious that you don t use twice the thickness for the height since you will not be putting anything on the floor but you have been reminded.
Smaller sizes can be found.
The height of your car makes a difference.
The height of the rough opening must be 1 5 inches taller than the garage door you intend to buy.
Next measure the sideroom or space available on the left and right sides of the opening.
To put it into perspective if the garage door is let s say 8ft tall make the height of your opening 8ft 1 5 inches tall.
Measure the head room the distance between the top.
You probably noticed that the height of a standard garage door is consistently 7 feet.
Leading garage door manufacturers typically sell doors in widths ranging from 8 feet to 20 feet.
You might be surprised at the range of standard sizes that exist today for garage doors.
Most vertical track systems.
That should easily fit most cars but not all.
Begin by using a tape measure to determine the width and height of the door opening in inches.