The purpose of this study is to simulate the emission of life cycle greenhouse gas (GHG) from foamed insulations of houses including the increase of thermal conductivity called as "Ageing". The simulation results are as follows; 1) If foamed insulations put in fluorocarbon are not used, GHG emission of detached houses is reduced by 50% in Sapporo, 70% in Tokyo. 2) In addition, GHG emission of apartments is reduced by 30% in Sapporo and 60% in Tokyo.
