Steel doors account for about 50 percent of the market. With foam core insulation they are energy efficient. Manufactured with a smooth or woodgrain surface, steel doors are delivered primed, or with a finish paint or stain. Steel doors resist shrinking, swelling and warping, but will scratch and rust if not quickly finished after being damaged.
Fiberglass doors also are energy-efficient with a foam core and are manufactured with a smooth but most frequently a woodgrain finish. More expensive than steel, fiberglass doors are less expensive than wood and are low maintenance when compared to wood. Finished in a variety of textures, fiberglass doors may be painted or stained to mimic solid wood. Fiberglass may crack under extreme pressure.
Solid Wood doors provide an expensive and substantial look to a home. Constructed from a variety of hardwoods — mahogany to oak— wood doors are 1-3/4” thick offering energy efficiency and security to the building. More expensive than other materials, wood doors must be maintained to eliminate warping, swelling and shrinking. A traditional choice for older and historic homes, wood doors can be stained or painted, and even hand-carved to variety of designs.