Originally Posted by Mallen83
The lower section of our door jamb broke off from being rotted out. I popped off the casing today to find there are no real jambs but the frame that came with the door originally. This frame is 4 1/2 x 1 1/4 x 80 on the legs. The pre cut door jambs at home depot are 5/16 x 6. I was planning on getting as close to 1 1/4 and routing out the hinges and lock positions. Anyone have an easier way?
You can buy a replacement exterior door frame in either wood or composite material. A standard frame is 4 9/16" wide.
If the frame is that bad, why not just get a new prehung door unit? The weatherstripping will be better and all the hinges and lock mortices are done. All you need to do is install the locks.
The other frame you're describing sounds like an interior door frame(though the dimensions make no sense) and should not be used.
If the door frame was that bad, you will have extensive damage to the subfloor and framing.