Análise custo-benefício entre os sistemas construtivos em alvenaria cerâmica e light steel frame frente a requisitos de desempenho termoenergético em edificações unifamiliares na ZB2.

Abstract

Given the constructive strategies observed in the Brazilian civil construction scenario, the present work aims to analyze the thermal performance requirements of buildings favor the insertion in the market of new construction technologies, such as LSF, taking into account the cost/benefit analysis in different reduction ranges, based on the costbenefit analysis, based on the guidelines and requirements of NBR 15.575 and RTQR thermo-energetic performance for single-family residential buildings in Brazilian bioclimatic zone 2. The method of this research proposes to use the standard projects of NBR 12.721 as a case study to verify which form the construction systems, from the envelope configurations determined by the SiNAT Directive and NBR 12.721, they meet the requirements of thermal and energy performance through the simulation method, adjusting them if they do not meet the minimum necessary. With the envelope defined, it was possible to quantify the direct costs and evaluate its thermal and energy performance them by the national civil construction cost indicators. Subsequently, the conserved energy was calculated in order to determine the investment by methods simple and discounted return time for carrying out the cost-benefit analysis. The results show that the intervention strategies allowed performed in the constructive compositions of the two systems covered in the study all tested models to reach performance levels A according to RTQ-R, although a cost of up to 33% has added to the initial value of the project with the simplest construction compositions. The results of the return-on-investment time point to the feasibility of adapting the two construction systems to level A of the RTQ-R in periods consistent with the useful life of the buildings.