Environment-conscious life-cycle design (eco-life-cycle-design) is a comprehensive method to reduce the environmental load and improve materials efficiency in the total life cycle of closed loop of production, in service, demolition, recycle/reuse, reproduction of building materials, components and/or systems. Special attention is paid to the compatibility of long service life with environmental harmony (ecobalance performance). This paper proposes and discusses this eco-life-cycle-design for new external thermal insulation systems using new short-cut fiber reinforced cement composites (FRC) as exterior materials.