In residential architecture and interior carpentry, casing refers to the specialized decorative trim boards and molding profiles installed around the perimeter of interior and exterior doors and windows. The primary function of casing is to bridge the structural gap left between the rough wooden framing studs or drywall edges and the actual door or window jambs, providing a clean, polished visual transition while covering up construction seams. In addition to its significant aesthetic value in enhancing a room's interior design, casing also acts as a draft barrier, prevents moisture infiltration into wall cavities, and protects vulnerable drywall edges from everyday impact damage caused by foot traffic, furniture moving, and cleaning activities.
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