Mill buildings are an example of which type of construction?

Mill buildings are classified as heavy timber construction due to the significant use of large wooden beams and heavy timber for structural support. This type of construction does not typically include modern lightweight materials, which tend to be used in more contemporary building designs. Heavy timber construction is characterized by its robust, durable materials that provide both strength and stability, making it suitable for structures like mill buildings that need to support heavy loads from machinery and storage.

The appeal of heavy timber construction lies in its ability to withstand fire for a longer period compared to lighter materials, due to the slower rate at which large timber members burn. This is particularly important in fire safety considerations, as heavy timber can offer more time for evacuation and firefighting efforts in the event of a fire.

In contrast, ordinary construction typically utilizes lighter wood framing and is not as structurally resilient as heavy timber. Steel construction involves the use of metal framing, which is not characteristic of mill buildings. Lightweight construction refers to modern techniques that use smaller, lighter materials, which again does not align with the traditional heavy timbers found in mill structures.