Mark the opening size for the door on both sides of the wall.
How to frame a door in a concrete block wall.
Place a level on the bottom of the frame and check to see if it is level.
Both the sleeve anchor and tapcon allow door frames to be placed in position leveled and plumbed before the anchor is inserted through the door frame.
Simply drill the hole in the base material with the door frame in place insert the concrete anchor and tighten.
Slide the door frame into the concrete wall opening.
If the wall is concrete you can proceed immediately to placing the frame.
In most cases one of those walls usually the one with the garage door itself will be concrete block.
Add another set of marks across the top of the frame to represent a steel lintel that will support the load above the door.
The opening should be two inches wider than the door frame and about an inch taller in height.
If the wall is made of concrete blocks you need to fill the cavities in the blocks to provide a flat surface to which you can attach the frame.
There is no prior spotting of the hole.
If it is not lift up the bottom of the frame and slide shims under the frame until it is level.
Secure the frame to concrete block.
Once both the top and bottom are secure the sides are secured based on whatever material is on the wall next to it.
Stack the shims on top of each other until the frame levels out.