A standard interior wall consists of a two-by-four frame with one layer of 1/2-inch-thick drywall on each side, for a total thickness of approximately 4 1/2 inches. The depth of a standard door jamb is 4 5/8 inches, which provides an extra 1/8 inch to account for slightly thicker walls due to stud size variation.

How much wider is door jamb?

Existing jamb should be 3/16" wider than the slab and at least 3/8" taller. There should be enough distance between the jamb edge and the stop to accommodate the thickness of the slab. Verify the existing jamb is square.

What is a standard door jamb size for 2x6 wall?

The standard sizes for prehung doors are 4 9/16 and 6 9/16. There is a 2 inch extension jamb on the 4 9/16 prehung door.