If you are installing a 9 wide door the opening will be 9 3 wide.
Rough opening for 9 ft garage door.
Step 1 measure the old door if you are replacing an existing door with one of the same size or the new door of choice if you are building a new garage.
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.
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 just in case this thought escaped you at the moment.
Frame the rough opening to a height that is 1 5 taller than the door that you have selected.
Framing rough opening sizes are really quite simple.
If the door is 7 tall frame the opening 7 1 5.
When pricing your door you will need to price a garage door exactly the size of the opening so when calling around for price points be sure that you have this information in hand.
Width of garage door opening standard widths are 8 9 10 12 14 16 17 and 18 height of the garage door opening standard residential heights are 7 7 6 8 header the header is ideally a minimum 12 wide micro laminated beam that spans the width of the garage door opening.
Cut four 2 x 4 trimmers to this length and nail two each to either side of the rough opening.
Standard garage doors start at 7 tall and increase in increments of one foot.
You should add 2 1 2 to the height of the actual door.
This will give you room to space the door frame off of the sub floor.
Measure the distance from the bottom plate of the wall to a point that is 1 1 2 inches higher that the garage door height.
For residential homes 99 of doors are either exactly 7 or 8 tall.
Frame the rough opening for the garage door to 3 inches wider than the garage door you have selected.
This would allow you to frame and wrap and apply the door seal around the outside of the door after it is installed with 2 x 4.
Frame the rough opening to 3 inches wider than the garage door size you have selected.
