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.
10 x 8 garage door rough opening.
Leave a headroom of 14 or 12 minimum.
This is assuming that you are using a 2 x 6 or 2 x 8 to finish the opening.
Rough opening for 20 x 10 garage door.
If you are installing a 9 wide door the opening will be 9 3 wide.
Many home builders do not consider this a structural necessity but a style and price choice for the homeowner.
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.
These boards are 1 5 thick.
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.
Rough opening for an over head door is the actual size of the door in this case 8 x 7.
Cut the header from 2 x 12 lumber and to a length of the rough opening plus 6 inches.
Make the rough opening 3 wider than the garage door.
If you are installing a 9 wide door the opening will be 9 3 wide.
After installing the jambs your garage door opening should now be the same size as the garage door.
Frame a few houses with a carpenter and you ll see.
Jambs go in vinyl weatherstrip known in the garage door trade as a stop goes on last.
Frame the rough opening to 3 inches wider than the garage door size you have selected.
Exact measurements are important to ensuring the correct fit and proper operation of your door.
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.
Install the header on top of the trimmers and nail.
Calculate your measurements to the closest fraction of an inch to make sure you have an accurate door size.
Nail or screw 2 x 6 jambs to the framing on the top first and then the sides of the rough opening.
Install the header jambs and center pad of the frame using a 2 x 6 lumber for the header jambs and center pad.
Robert broome on september 14 2020 at 11 08 am the rough opening should be 19 9 x 9 10 5.
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.
The standard size for double garage doors is 16 feet wide and 7 to 8 feet high.
Many homeowners have two cars and need garage space to shelter them both.