## Appendix A List of Renovation Measures  
The following tables summarize the thermal and geometrical properties of the envelope of the building and the different systems of the building, whether they exist or not, in its current conditions. They include the description by an image of a cross section, each layer thickness and material, and the U-value when appropriate or other thermal property. \begin{table}
\begin{tabular}{c c c} \hline \hline \multicolumn{3}{c}{**Fagade:** Transmittance U = 1.17 W/m\({}^{2}\)-K} \\ \hline \multirow{4}{*}{**Fagade:** Transmittance U = 1.17 W/m\({}^{2}\)-K} \\ \cline{2-3}  & Layers & Materials & D (cm) \\ \cline{2-3}  & Ext. & Exposed ceramic brick & 11.5 \\ \cline{2-3}  & 2 & Air chamber & 3 \\ \cline{2-3}  & 3 & Hollow ceramic brick & 7 \\ \cline{2-3}  & Int. & Plaster lining & 1 \\ \hline \multicolumn{3}{c}{**Rood:** Transmittance U = 1.47 W/m\({}^{2}\) K} \\ \hline \multirow{4}{*}{**Fagade:** Transmittance U = 1.47 W/m\({}^{2}\) K} \\ \cline{2-3}  & Layers & Materials & D (cm) \\ \cline{2-3}  & Ext. & Outdoor ceramic tiles & 2 \\ \cline{2-3}  & 2 & Gripping mortar & 1 \\ \cline{2-3}  & 3 & Waterproofing sheet layer & 0.3 \\ \cline{2-3}  & 4 & Horizontal ceramic brick base & 3 \\ \cline{2-3}  & 5 & Air chamber & 22.5 \\ \cline{2-3}  & 6 & Existing slab & 25 \\ \cline{2-3}  & Int. & Gypsum plaster & 1 \\ \hline \multicolumn{3}{c}{**Slab:** Internal slab between the ground floor and the first floor. Transmittance U = 1.72 W/m\({}^{2}\)-K} \\ \hline \hline \multicolumn{3}{c}{Layers} & Materials & D (cm) \\ \hline \hline \multicolumn{3}{c}{Int.} & Marble floor finish & 1 \\ \hline \hline \multicolumn{3}{c}{2} & Cement mortar & 1 \\ \hline \hline \multicolumn{3}{c}{3} & Reinforced concrete slab & 25 \\ \hline \hline \multicolumn{3}{c}{4} & Air cavity & 2 \\ \hline \hline \multicolumn{3}{c}{Ext.} & Plasterboard ceiling & 1 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Main thermal and geometrical properties of the present building envelope and systems. **Table A1. **_Cont._  
**Windows:** Transmittance U (W/m\({}^{2}\) K) = 5.7  
Description  
Single-glazed units with aluminum frame system without thermal bridge break. The glazing solar factor is 0.85. Folding leaf opening system. **Balcony doors:** Transmittance U (W/m\({}^{2}\) K) = 5.7  
Description  
Single-glazed units with aluminum frame system without thermal bridge break. The glazing solar factor is 0.85. Sliding door opening system. **Thermal bridges 1:** Joint between facade and slab at balcony. Linear thermal transmittance \(\Psi_{\text{e}}\) (W/mK) = 1.003  
Description  
The initial values for the linear thermal transmittance were selected from the official documents of the Spanish Technical Building Code [38] except for the joints between facades and slabs because these were not present in the previous atlas. The initial value of this kind of thermal bridge was evaluated using the Therm(r) software tool. The figure on the left shows the heat flux gradient. The evaluated psi-value of the detail is 1.003 W/mK. **Ventilation system:** air changes per hour, ACH = 1  
Type  
Description  
Natural  
The ventilation rate of the existing building currently relies only on natural ventilation from opening windows. Thus, for the assessment of the energy needs, the software tool considers the minimum air ventilation rate required by the building technical code, which in this building is 1 air change per hour (ACH). **Infiltration:** n50 = 10  
Description  
The initial airtightness of the building was quantified by a n50 value of 8.5 which corresponds to the average value of the existing buildings in Spain [39]. **Domestic hot water (DHW) system:** n = 0.92  
Type  
Description  
The domestic hot water system is based on a mixed gas boiler with a seasonal performance of 0.92.