cerned, the original ones were to be replaced with new thermally insulated ones, respecting the existing window sizes in keeping with the facade’ s enclosed and empty space rapport. The plastered walls compared to the previous grit-blasted ones no longer result in a facade dominated by horizontal stripes, which made the buildings seem much longer( fig. 4). To lessen the complex’ s compactness, terraces were introduced at different levels, which other than creating a landing to access some apartments, break the linear aspect of the balconied gallery and become places for people to relax or socialize. To understand the energy performance of Building A, a study was carried out using STIMA software which resulted in drawing up a model where, for each environment, the elements of the existing closures, walls and floors, and the relevant trasmittance value, were included to obtain an energy performance assessment for the whole construction.
Figure 5: Building A today: duplex apartment and transmittance evaluation for external wall and windows
Furthermore, as it is a building with a centralized heating system, the simplex apartments were considered as one single large environment while the duplexes were considered as two different environments. The transmittance values were compared with the ministerial decree of 26 November 2010 published in Official Gazette n. 35, 12 / 02 / 20106 concerning building energy requalification, updated from the ministerial decree of 11 March 2008( amendment of legislative decree n. 192, 19 August 2005). Instead, for the total building calculation and the relevant energy certificate, the UNITS11300( the recommendation of the Comitato Termotecnico Italiano regarding building energy certification) was used. The checks were carried out taking into account the present exterior walls, made of an 8 cm reinforced concrete panel, a 14 cm air cavity, a layer of 8 cm perforated plaster and of plaster board, where, as can be seen in the Glaser diagram, no condensation occurs between the layers. The calculation of the transmittance, instead, highlighted the problem of thermal dispersion being u = 0.518 w / m ² k more than the minimum values forecasted by law( 0.29 w / m ² k). In the covering floor, the Glaser diagram highlights the formation of condensation inside the damp-proofing and this would require adding a vapour barrier before insulating to avoid the damaging effects of condensation. In this case, the transmittance value( u = 0.492 w / m ² k) is much higher than the values forecasted by law( 0.26 w / m ² k).
Energy retrofit for Rome municipality’ s residential real estate( ATER) 709