Measure your door carefully and cut the opening to fit using a reciprocating saw.
Door frame and door installation.
The size of the door opening will vary depending on the size of the door you plan to install.
Door and frame combinations can be found in any home improvement store.
Determine the size of the door opening.
If you choose to install a front door made of steel you will need a helper.
Next add glue to the end of 1 of your longer pieces of wood and attach a shorter piece to it.
Shim between the side jambs and the studs to fill in the spaces between them.
The door frame should be slightly smaller than the opening it fits to allow for adjustments.
Measure both the door and rough opening to make sure the door is the right size.
A typical door opening is 2 inches 5 1 cm wider than the door size being installed to allow for the thickness of the jamb material and shims to plumb the jamb.
Slip shims under the side jamb until the head jamb is level.
Installing an exterior door that is insulated and made of steel can be heavy and cumbersome due to the weight of the materials.