Final answer:
The most common exterior wood doors are found on historic Shotgun Houses and Creole Cottages, as discussed by Mr. Hust. These iconic Southern house types are known for their unique layouts and built features like ensconced porches.
Step-by-step explanation:
According to Mr. Hust, the most common exterior doors made of wood are found on C Shotgun Houses and Creole Cottages. Shotgun Houses, common in the Lowland South, have a distinctive layout that allows for a visual line of sight from the front door to the back door, and this may be how it earned its name. Alternatively, the term might derive from a misinterpretation of the African-Haitian word for house, "togun."
The Creole Cottage, also known as the Grenier House, is another prevalent Franco-American house type. Its distinguishing feature is the built-in or ensconced porch, which is unlike the more typical attached porches found in other Southern house designs. Creole Cottages typically have two front doors leading to separate rooms without an interior connecting doorway.
Neither house type describes the materials used for doors, but in the context of traditional house types, especially in the period and regions mentioned, wooden doors would have been the material of choice due to their availability and ease of work.