What is a transom in construction?

A transom in construction specifically refers to a horizontal member that is situated above a door or window. It serves both structural and aesthetic purposes. Structurally, the transom can support the weight of the wall above the opening, while also allowing for additional light and air to enter the space through a window that may be installed in it. This design element can create a more visually appealing transition between spaces and enhance the overall architectural style of a building.

While other options mention construction elements, they do not accurately define a transom. A vertical supporting beam, for instance, is typically known as a post or column, while reinforcement usually pertains to materials used to strengthen structures, such as rebar in concrete. Insulation focuses on energy efficiency and temperature control within a building, which is unrelated to the structural role of a transom.