If the wall is concrete you can proceed immediately to placing the frame.
How to frame a door in a concrete block wall.
Add another set of marks across the top of the frame to represent a steel lintel that will support the load above the door.
Mark the opening size for the door on both sides of the wall.
Examine the sides of the door opening in the wall to determine the material makeup of your foundation wall.
Once both the top and bottom are secure the sides are secured based on whatever material is on the wall next to it.
Place a level on the bottom of the frame and check to see if it is level.
Simply drill the hole in the base material with the door frame in place insert the concrete anchor and tighten.
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.
The opening should be two inches wider than the door frame and about an inch taller in height.
In most cases one of those walls usually the one with the garage door itself will be concrete block.
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.
There is no prior spotting of the hole.
The tutorial begins after the hole in the concrete has al.
Slide the door frame into the concrete wall opening.
If it is not lift up the bottom of the frame and slide shims under the frame until it is level.