If you are finishing the opening with 2x8 then the rough opening is 3 inches wider and 1 1 2 inches higher than the door or 9 3 x 7 1 1 2 etc etc.
Finished garage door opening.
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.
The size of the finished opening should be the exact same size as the sectional garage door or down to 1 smaller on each side and or the top.
It may be easier to entirely disconnect the opener and set it aside.
If there isn t enough room above the opening this can t be done without raising the roof of the garage.
Once again it should be obvious that if you have an arched opening the height would be the same as the highest point of the arch.
Finished opening is the same size as the door.
The span above the door opening is framed with a long header that supports the wall area above the door and this header will need to be raised or rebuilt in order to increase the overall door size.
This way the door will have a nice tight seal once the weatherseal or door stop molding is applied.
As i stated earlier you will want the finished opening to be the same size or slightly smaller than the door.
Does 15 leave enough room for the door tracks and a center mount chain driven electric door opener.
How to measure the finished width and height use of 2x4s for the sides and header.
The rough opening is equal to the size of the door but you need to figure back head and side room before choosing and installing the new garage door.
Reinstall the garage door track brackets using a new section of angle iron on the ceiling.
So the rough opening depends on how you are going to finish the opening.
The garage ceiling will not be sheetrocked or finished this leaves 15 from the top of the door to the bottom of the ceiling joists.
All of the rough framing has just been completed.
While technically the door could overlap the opening as much as the space will allow the design on the outside of the door disappearing behind the jamb will tend to distract from the overall outside.
The doors extend beyond the finished trim you see from the front a fact that must be taken into consideration when framing and preparing the area for installation.
How to frame a garage doors opening in this case 9ft wide by 8ft tall.