Voided biaxial slabs, sometimes called biaxial slabs, are a type of reinforced concrete slab which incorporates air-filled voids to reduce the volume of concrete required. These voids enable cheaper construction and less environmental impact.[citation needed] Another major benefit of the system is its reduction in slab weight compared with regular solid decks. Up to 50% of the slab volume may be removed in voids, resulting in less load on structural members.[1] This also allows increased weight and/or span, since the self-weight of the slab contributes less to the overall load.