A significant volume of waste building materials go to landfill sites, at a cost to both the economy and the environment, others are recycled at a cost to the community. Aluminium however, is recycled in a way that pays for itself. Aluminium components can usually be recycled in a single process using up to 95% less energy than the primary production process. As almost all aluminium used in construction is recycled, the considerable energy invested in the production of primary aluminium can be reinvested into other aluminium products. Scrap may not necessarily be recycled back into its original product or even reused in the country in which it was first manufactured but the original energy investment will not be lost.