LOW-EMISSION HEAT INSULATION FOR ROOF CONSTRUCTIONS

This research was carried out to start the discussion on the amount of harmful emissions that are emitted in producing building and insulation materials for roof constructions. Usually, for the improvement of energy efficiency of buildings and reduction of the embodied thermal energy, effective thermal insulation solutions for the external building envelope have to be provided. From the buildings available for the analysis, in Latvia there were selected multi-apartment buildings of separate series with a uniform composition of roof constructions. Within the context of renovation works, the reports of energy audit for the buildings contain recommendations referred to improvement of the thermal performance of roofs. Using mutually comparable energy efficiency report data, there was drawn up an averaged model of a five-storey multi-apartment residential house. There were taken into account legislative documents relating to thermal engineering of buildings: LBN 002-01 'Heat engineering of building boundary constructions' and LVS EN ISO 6946: 2007 'Building components and building elements - Thermal resistance and thermal transmittance', and moisture regime according to LVS EN ISO 13788: 2001 'Hygrothermal performance of building components and building elements - internal surface temperature to avoid critical surface humidity and intersatial condensation - calculation methods', which states that the roof constructions should be free from possibility of water vapor condensation. In this study, there were calculated energy savings obtained by improving thermal resistance of the roof constructions and the opposite primary energy consumption for the production of building materials. As a result, there is obtained environmentally friendly roof construction.