If the wall you are fitting to is masonry you ll want to space the screws so they fall in the middle of the bricks or blocks instead because too close to the edge of a brick and it ll just split or shatter.
Fitting a door frame to brick.
When placing a door in an opening these doors must be fastened to the base material that is present in this location.
This will keep the frame sturdy while you fit it in the opening.
Drive a inch tapcon style concrete screw through each hole in the frame into the corresponding hole in the brick.
Tighten the screws until the heads are flush with the face of the timber frame.
Measure the distance between the jambs at the head of the liner and cut a piece of timber the same length.
Fix this piece of timber between the jambs at the bottom of the frame.
Actually a great way to install doorframes if the pain i have had to go through to get doorframes out that were fixed this way is anything to go by.
Because of their strength and durability steel door frames are often used in masonry walls in place of traditional wooden frames.
Use chalk to mark the areas where you want to cut through the brick.
If you are going to install a door into the frame take into account the exact dimensions of the door when you make your measurements on the wall.
Metal frames are typically installed before the brick or block is erected.
Fit wedges under the sill to push it up against the lintel.
Most frequently this base material will be concrete brick or block and will require the use of special concrete fasteners.
Before you make your first cut double check the measurements.
Determine how tall and how wide you want the doorway to be.
Insert the assembled frame into the opening.
Use a spirit level repeatedly to check the vertical alignment.
Use more wedges to get the jambs upright.
For example a frame made of 2 by lumber would require a 3 inch concrete screw.
Measure the frame diagonals to ensure that the frame is perfectly square as diagram k.
Use a spirit level to get the sill perfectly horizontal.
By screwing the frame in place you can adjust it by winding the screws in out later and wedging behind it.
In many retrofit applications however it is necessary to remove and replace existing frames in walls that are already in place.
Use a screw 1 inches longer than the thickness of your frame.