Prefabricated buildings consist of factory-built components that are assembled on-site. Modern prefab flats incorporate green materials and allow owners to select environmentally friendly finishes. They are strong, versatile, and easier to build in remote locations because galvanized steel parts are shipped to the site rather than assembled there. The exterior frame and full cladding system can also be quickly set up on-site. Cladding provides a protective skin or layer over the building structure to control weather infiltration without being load-bearing. Prefab flats use a frame-and-cladding system making additions and renovations easier since non-load-bearing parts are replaceable.