The diagonal measurements should be the same.
Rough opening for 12x8 garage door.
For instance if the width of the garage door is 8ft the rough opening should be 8ft 3 inches wide.
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.
Nail or screw 2 x 6 jambs to the framing on the top first and then the sides of the rough opening.
Width meaning your header should be 16 feet 9 inches long.
Verify the width and height of the door frame are each 1 2 smaller than the rough opening width height.
More rough opening tips.
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.
This 12 x 8 model 2500 is the new standard for heavy duty commercial sheet doors featuring universal mount 4 deep 12 gauge galvanized steel guides for strength and durability.
It is important to note.
Words like rough opening are thrown around and i m not sure if we are speaking about the same thing.
After installing the jambs your garage door opening should now be the same size as the garage door.
Next you will need to know your door height.
The easy installation versatility and easy operation make this door the standard of all commercial sheet doors.
In our business we refer to rough openings as the size of the opening before the finished lumber has been added to the jambs.
Width of rough opening the width of the rough opening should be 3 inches greater than the width of the garage door you are purchasing.
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.
99 of the residential garage doors that we run across are different than these widths.
To make my.
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.
Provide enough load bearing strength to cover the 16 foot opening span.
Standard garage doors in our area are 8 9 16 and 18 wide.
Verify the rough opening is square.
Ordering a garage door based on a rough opening size can leave you with a door that is too big.
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.
Maximum allowable deviation from square is normally 1 4.
If it s 9ft the opening must be 9ft 3 inches and so on.
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.
Cut the header from 2 x 12 lumber and to a length of the rough opening plus 6 inches.
Verify the rough opening is level and plumb.
