Which type of construction often includes trussed roofs?

Trussed roofs are a characteristic feature of lightweight construction. This type of construction utilizes a system of trusses—prefabricated structures made up of triangular units that efficiently distribute loads and create open spaces. Lightweight construction is known for its reduced overall weight, which can lead to faster and more economical building processes.

Additionally, trusses made from wood or metal are designed to provide maximum strength while minimizing material use. This contrasts with other construction types such as ordinary construction and heavy timber construction, which do not typically integrate trussed roofs to the same extent. Fire-resistant construction, while focused on materials that can withstand high temperatures, does not inherently relate to the use of trussed roof systems, which are more common in lightweight methods.

In summary, lightweight construction is specifically designed to utilize trusses effectively, making it the correct answer in this context.