In construction and carpentry, casing refers to the decorative or functional framing boards installed around the perimeter of door and window openings to conceal the rough gaps between the drywall or framing studs and the window or door jambs. Serving as both an aesthetic finish and a structural transition, casing bridges the gap between the wall surface and the door or window frame, providing a clean, polished appearance while preventing drafts, moisture penetration, and dust accumulation. Casing profiles can range from simple, flat, minimalist boards in modern architectural designs to heavily ornate, multi-layered moldings in traditional or Victorian homes, often matching the style of baseboards and crown molding used throughout the rest of the building interior.
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