Recycled building materials are those that are partially or entirely produced from post-industrial or post-consumer waste.  Another environmentally friendly practice is to use surplus building materials, which are excess, unused or salvaged building materials that may be used for another construction project when they are no longer needed for the intended project.  Green, recycled, and surplus building materials are environmentally responsible choices due to the reduced negative impact they have on the environment. Some examples of recycled building materials are composite lumber (made from waste wood), recycled polystyrene, insulation made from recycled products, shingles made from recycled aluminum, plastic lumber & pavers made from recycled products, and many more.  Providers listed in this section are committed to offering recycled and surplus building and construction materials and products.