Most brick manufacturers have incorporated recycled materials into their brick production in one form or another for years. However, with the advent of various green building rating systems, determining the exact amount and type of recycled content material has become more crucial.

Materials used as recycled content can come from either post-consumer or pre-consumer (post-industrial) sources. Brick units may incorporate recycled materials such as overburden from mining, washings from aggregate processing, grog, sawdust and metallic oxides. These are typically considered pre-consumer recycled materials.