I am in the process of replacing the front door on my house, and I've run into an interesting issue. The front door opens to a covered concrete porch with a single concrete step that comes up to the same level as the finished floor on the interior of the house (see picture links below). I plan to remove everything down to the rough opening, and install a new pre-hung unit with door and sidelights as a single piece.
After removing the threshold and interior trim it dawns on me that there is no wooden sill at the bottom of this door opening. The sides of the door frame seem to be embedded directly into the concrete step. I'm going to have a problem with the new prehung door I'm going to be purchasing since it will have a full frame.
I don't really want to sit the new door frame on top of the concrete step because that would make the door much higher than the interior floor, and also the step is angled downward toward the outside so it won't make a level platform. Is my best option to bust out this step with a jackhammer and build it back up with wood? Any advice on how to do that?