In this study wall dimensions were decided just by means of structural calculations. However, in addition to satisfying the structural requirement, the outer building walls also have to fulfil other requirements as a building envelope. In this case the thermal parameters (such as heat transfer coefficient) of the walls should be taken into account before running LCA. In any case, the inclusion of the thermal conductivity variables would require selecting the examples proposed through a more defined case study. Thus the differences between inner and outer walls should be considered and so complementary materials for insulation or thermal comfort could be included to fulfil the requirements due to a given climatic zone. These variations would imply a new perspective for the present investigation and for an specific case quite possibly would improve the LCA relationship between SS and CB considering that CB has much less mass comparing to SS, but certainly provides much less thermal comfort than SS.