Foam structure in macro-scale has arisen recently as an impressive large span building structure which is the product of advanced structural design, radical architectural approach, and powerful computer-software technology. As a result of this interdisciplinary success, the efficiency of large span foam structure became an important question to answer which could lead further structural improvements. This study analyses efficiency of a large span foam structure relative to conventional large span building structures which are space frames by using a parametric simulation method. The...