Abstract
The article provides the correlation analysis of thermo-insulation layer thickness of the typical pitched roof detail and its investment payback period in the traditional new construction single-apartment residential and net-zero energy building. The calculations are carried out between the building's energy efficiency class and the building construction geographic area. On the basis of the results a simple and real payback period was calculated. The main aim – thermal transmittance coefficients of roof must satisfy the normative value of technical regulation of construction and European standards. Lithuania was chosen as the research object. Calculations for seven towns were carried out: Vilnius, Kaunas, Klaipeda, Siauliai, Panevezys, Utena, and Dukstas. Correlation analysis results are important not only for designers making decisions in a pre-projection stage, but also for the auditors and experts of buildings energy consumption.
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