Gap In Door Jamb And Casing - Carpentry - DIY Chatroom - DIY Home ...

The best way to close the gap is with jamb extensions. It's the type of job that is a little tedious and requires some carefully attention to get it right.

Rip some thins strips of wood to 3/8" thick x the thickness of the door jamb, probably 5/8". Be sure to keep the end grain against the existing jamb. If the existing door jamb doesn't have a rounded edge, you can attach the jamb extension to the jamb using strong wood glue and clamping it in place for a couple hours. Then sand it down to a nice flush finish and re-attach the door casing.

If the existing door jamb has somewhat rounded edges you can set the jamb extension back an 1/8" to match up with the edge of the door casing, effectively thickening the edge of the casing to close the gap.

The alternative would be to get some new, thicker casing and rabbet the back to have a thicker edge against the door jamb.

Source: http://www.diychatroom.com/f14/gap-door-jamb-casing-110042/

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