doorframe

Doorframe is the structural surround around a door opening in a wall. It provides support for the door, a mounting surface for hinges and hardware, and a guide for proper operation. The vertical members are called jambs; the horizontal member across the top is the head or header; the bottom element around the floor is the sill or threshold. The frame is typically set in the rough opening of the wall and is fastened to surrounding studs; interior frames may be finished with trim or casing to conceal gaps.

Materials and styles vary. Wood frames are common for interior doors and are compatible with many finishes, but they can shrink or swell with humidity. Metal frames, including steel and aluminum, offer greater security and moisture resistance, especially for exterior doors. Fiberglass or composite frames are used for durability and low maintenance, particularly in harsh climates. Frames may be designed to accommodate weather sealing and insulation with integrated weatherstripping or a separate door stop.

Installation and adjustment require a plumb, square frame anchored securely to the wall structure. Shims are used to align the frame, hinges are attached to both the frame and door, and hardware is installed. After installation, weatherstripping is fitted, a threshold is set, and trim is applied.

Maintenance involves inspecting for warping, rust, or loose hardware, resealing or repainting as needed, and replacing worn weatherstripping to maintain energy efficiency and seal.