interiordoor

An interior door is a door used inside a building to separate rooms and control privacy, light, sound, and climate. Unlike exterior doors, interior doors are not typically designed to resist weather and may be lighter or thinner. They are selected for function, acoustics, and aesthetics within a space.

Common configurations include hinged doors for most rooms, sliding doors (including pocket and bypass types), French doors with multiple panels, barn doors, bi-fold doors, and louvered doors that provide ventilation.

Materials range from wood and wood-based composites to hollow or solid cores, fiberboard (MDF), metal, glass panels, and composite hybrids. Solid-core and veneered doors generally offer better sound dampening and durability than hollow-core doors, at higher cost. Finish options include paint, stain, or veneer.

Doors are installed in a frame (jamb) set within a rough opening. Most interior doors are prehung with their frame. Hardware includes hinges, door handles or knobs, locks, strike plates, and weatherstripping. Standard interior doors in the United States are typically 80 inches tall, with widths of 24 to 36 inches; common thicknesses are 1 3/8 inches for hollow-core and 1 3/4 inches for solid-core doors.

Performance is described by insulation and acoustics ratings. Some interior doors are fire-rated for specific assemblies. Weatherstripping helps seal gaps to improve energy efficiency and reduce noise transfer.

Design considerations include matching style to the surrounding architecture, hardware finishes, and door alignment with flooring and trim. Regular maintenance involves cleaning, occasional refinishing, and checking hardware alignment.