Repairing rotted door jambs.
Marty on Jul 22, 2020
I've have done this in this manner on several of my door jambs. Turns out fairly well but I see two things in this that I didn't do, both would have helped: (1) Using the biscuit. Has to help alignment of the pieces and keep them from moving a little when nailing, and (2) using a longer piece of the brick molding which also would help keep the pieces lined up.
I think the rotting is due to the lower edge of the wooden pieces being left unpainted or sealed by the builder, allowing water to wick up. All my replacement parts were vinyl or fully painted.
Jim P on Jul 22, 2020
This fix may not work on vinyl. The door frames I repaired were wood.