Resumen
This paper is the result of the research conducted at the University of Porto and follows up on the Ph.D. thesis developed by the second author, which deals with the issue of the non-inclusion of maintenance at the time of architectural design, and of support instruments for the project author to help him in this endeavor. This work is intended to apply a guiding methodology to the design process that includes building maintenance benchmarked by the service behavior with regard to pitched roofs. The development of a decision support model enabled to obtain a maintainability index (MI) to be identified and results from the combination of two indicators: the importance indicator (Iid) and the easiness indicator (Eid). The results achieved enable the project author to have a support tool for making decisions that affect the building behavior in service as well the act of the preservation of heritage value.