Computation and analysis of corrected thermal insulation in a common dwelling building in Romania, in various thermal insulation variants – The slab over the soil

Abstract

The present paper investigates the magnitude of the corrected thermal resistance of the slab on the soil in the case of a usual dwelling building in Romania. For computational purposes, the CIMPSPAT software [8] was used; it uses the very accurate numerical method of the thermal balance written in the nodes of the computational grid, according to the provisions of SR EN ISO 10211:2008 [7]. The research was performed for eight variants of thermal insulation layer, with thicknesses varying from 5 to 40cm. When buildings are designed, in general, only the one direction thermal resistances are considered, without taking into account the regulations in Standard C107/2010 [6] and Order no. 2641/2017 [3], which requires specific minimal values for corrected thermal resistances, including thermal bridges, for various construction elements (external walls, external joinery, floors over the last level, slabs on the soil, etc.) [1]. For the slab over the soil, for instance, a thermal insulation layer made of extruded polystyrene of 5, rarely 8 or 10 cm is generally used [1]. This research, performed on a common dwelling building in Romania, aims at finding out the minimal thickness of the thermal insulation layer that meets the requirements of the Norms in C107/2010 [6] and Order no. 2641/2017 [3], that specifies a minimal value for the corrected thermal resistance of the slab over the soil of 4,50 m2·K/W [2].