Install the header on top of the trimmers and nail.
9 foot garage door rough opening.
Standard garage doors in our area are 8 9 16 and 18 wide.
Frame the rough opening to a height that is 1 5 taller than the door that you have selected.
Verify the width and height of the door frame are each 1 2 smaller than the rough opening width height.
Verify the rough opening is level and plumb.
Many home builders do not consider this a structural necessity but a style and price choice for the homeowner.
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 or 6 boards.
Hope this helps you.
Next you will need to know your door height.
9 3 wide for the width and 7 11 2 for the height.
1 2 or 1 in one direction of the other will won t typically cause you to have to shop for a non standard garage door size.
99 of the residential garage doors that we run across are different than these widths.
Verify the rough opening is square.
Many homeowners have two cars and need garage space to shelter them both.
If the door is 7 tall frame the opening 7 1 5.
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.
Many 16 x 7 garage doors will be designed with a pair of single 8 foot garage door bays separated by a central post or column.
The diagonal measurements should be the same.
Cut four 2 x 4 trimmers to this length and nail two each to either side of the rough opening.
This guide is intended primarily for our builder customers to explain in detail the measurements and condition we need the work site to be in to properly co.
More rough opening tips.
Frame the rough opening to 3 inches wider than the garage door size you have selected.
These trimmers should be on edge just as the studs in the wall rather than flat.
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.
If you are installing a 9 wide door the opening will be 9 3 wide.
Cut the header from 2 x 12 lumber and to a length of the rough opening plus 6 inches.
However if you are putting bricks thick river rock stones marble or anything else on both sides that is more than 1 thick you will want the rough opening the same.
Therefore making the width of the garage door rough opening the same size as the door would be fine if you are going to use a thin layer of stucco vinyl siding or 1 by lumber.
Maximum allowable deviation from square is normally 1 4.