This topic includes information related to lavatories and sinks that are installed in commercial structures during construction. Sinks are fixtures, that in conjunction with a faucet are used for cleaning. Sinks are commonly referred to as lavatories in bathrooms. They are made from a variety of materials, including stainless steel, enameled steel or cast iron, ceramic, marble, plastic, soapstone, concrete, terazzo, wood, stone, copper, glass and granite.