A.Gary Katz, a finish carpenter in Reseda, Calif.; moderator of JLC Online's finish-carpentry forum; and a frequent contributor to JLC, responds: I've installed thousands of hollow-core prehung doors in apartments, condominiums, and housing tracts — all without shims.

If the rough openings are sized 2 inches larger than the net door size, and if the door frame is roughly centered in the opening, the remaining gaps between the jambs and the framing are only 1/4 inch to 3/8 inch wide. Four 2 1/2-inch-long nails through the jamb at each hinge — a pair above and a pair below — and pairs of nails through the...

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