Comparação de investimentos em sustentabilidade com a redução do custo com desperdícios devido à construção enxuta.

Abstract

This paper presents a comparative analysis between the investments made in sustainable practices and the savings due to reduction of costs with waste of materials related to the implementation of lean construction practices. The impacts on the final budget of a multifamily residential building located at Fortaleza ñ Ceara ñ Brazil are quantified by the Green Cost and Lean Saving observed in its construction process. The Green Cost is determined by the surveying of the costs related exclusively to the buildingís process of certification and labeling, which is LEED Certified in category Core&Shell and has the Etiqueta PBE Edifica/INMETRO for Project and Constructed Building level A. The same building has also lean construction practices completely absorbed by its building process, providing a cost reduction with waste, here denominated Lean Saving. The methodology of this study consisted in surveying the investments in sustainability made on the building and determining their impact on the final budget, followed by determining the reduction of waste production, comparing the current project with the last one built prior the implementation of lean practices on the construction site, and the application of the percentage of reduction of waste on the loss index of each material on the final budget of the project in question, finally obtaining the cost reduction of waste material and waste transport in relation to the buildingís total cost . The results were compared and this study showed a raising of 1,32% due to green buildings features on the final budget of the building and a saving of 0,19% on the final budget due to reductions observed on the production of construction and demolition waste and the losses of materials, which results on a compensation of 14% of Green Cost by the Lean Saving.