For the buildings production, the better solutions against greenhouse gas emission

The paper focuses on the assessment of greenhouse gas emissions produced by the walls of buildings according to their lifespan. These assessments take account the entire cycle life. The contribution of the utilization phase must be equivalent for all technical solutions for a given usage function. In the first part of the work, the methodology is described by considering a unit area of wall (i.e. 1 square metre), determining a long service life, choosing technical solutions in agreement with the specifications, establishing the lifespan of each technical solution according to experts, finding the corresponding greenhouse gas index from an appropriate database, and finally modelling the evolution of these indicators with time. Several technical solutions (concrete, brick, stone, wood, aerated concrete) are considered and lifespans range from a few years to centuries.

The results of this analysis suggest and quantify the important impact of lifespan on greenhouse gas emission indicators. Too, the stone is the best solution for a long life.