What is the inner piece around a door frame called?

• A. Jamb
• B. Casing
• C. Sill
• D. Architrave

Answer: (A)

The term that describes the inner piece around a door frame is "jamb." Jambs are the vertical components that form the sides of a door frame. They support the door and provide a surface for the hinges. The jambs are essential for the structural integrity of the door frame, as they help to secure the door in place and allow it to open and close smoothly.

While there are other components associated with door frames, such as casing, sill, and architrave, these serve different purposes. Casing typically refers to the trim that finishes off the door frame, covering the joints between the wall and the jambs. The sill is the bottom part of the door frame, often found in exterior doors, which helps keep out water. Architrave is more of a general term for the decorative molding around the door frame, which can include the casing but is not specific to the jambs themselves. Thus, "jamb" is the most accurate term for describing the inner vertical pieces surrounding a door frame.