The "Structure" category includes all materials and products used to create the framework of a building. Included are materials such as concrete, steel, aluminium, other metals, timber and plastics.
Components and ancillary items of the above materials are also included, such as cements, aggregates, formwork.
Structural products comprised of such materials are also listed here, such as timber trusses, steel beams and flooring, timber and metal framing products, precast concrete items, anything used to form the project's "skeleton" and give it strength.