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.
Rough opening for 8 x 16 garage door.
For instance if the width of the garage door is 8ft the rough opening should be 8ft 3 inches wide.
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.
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.
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.
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.
Next you will need to know your door height.
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.
Standard garage doors in our area are 8 9 16 and 18 wide.
If it s 9ft the opening must be 9ft 3 inches and so on.