What's the difference between Casing and Trim?
Trim is a general term, often used to describe all types of molding and millwork.

Casing is a type of molding, typically used to trim the perimeter of windows and doors. Casing is typically less wide (tall?), but thicker than base molding.


11/16" x 2 1/4"

Base molding (or baseboard) is a type of molding, which is applied where the wall and floor meet.


9/16" x 3 1/4"

Crown molding (or crowns) is a type of molding, which is applied where the wall and ceiling meet.


7/16" x 3 5/8"



I think what the person was saying, was that the previous owner used casing in place of base molding.