This month, we are going to report how our products can help them to improve the comfort of their buildings, guarantee a better thermal behavior of the complex, as well as, to make buildings demand less energy, which will produce greater savings. Therefore, we will focus on reporting that, thanks to the renovation of a roof and part of the façade of a sports center, the building's comfort and energy efficiency conditions improved considerably.Description of the interventionIn the specific case now at hand, the main reason why it was decided to intervene in the building had nothing to do with improving energy efficiency, since the building had corrosion in its structure and needed intervention to slow down its progress. But thanks to the fact that the drafting team of the rehabilitation project and at the same time, to the developer, understood the reform as an opportunity to improve the entire building, the opportunity was taken to respond to other problems unrelated to the above-mentioned environment. The main problems afflicting the sports center were the following:

• Visible degradation of the structure due to corrosion of the structure, caused by exposure to the surrounding marine environment.

• Excessive energy demand due to a lack of thermal insulation, causing large heat losses in winter in heating and greater demand in summer for cooling.
• Glare problems on the sports court, caused by the entry of unscreened sunlight through the skylight located on the roof and by the openings on the façade.

Faced with this situation, the covers of the sports center were repaired and partially replaced. In the case of the cover, it was completely replaced. Specifically, in addition to the repair of the structure, the existing covering panel was changed to a metal one with a creased profile, in addition to the replacement of the colorless cellular polycarbonate in the vault that crossed the installation. In both cases, both in the metal panel and in the plate, the thickness of the panels was increased, thus the transmittance coefficient of the panel improved considerably. Well, with this increase, we went from an enclosure with a transmittance of 0.93 Wm²K to a significantly improved one of 0.63 Wm²K, thus complying with the CTE because the requirement in this case was 0.65 Wm²K. This achieved an environmental improvement of 30% of the thermal coefficient of the envelope and thus improved heat losses both in winter and summer. In the façade, it was decided to replace the connecting section between vertical enclosure and roof. It was a strip of about 3m, formerly solved with a 16 mm colorless cellular polycarbonate panel. This was replaced by a mixed solution between the same corrugated metal roof panel and cellular polycarbonate. It must be said that, in all the installed envelopes, in the case of polycarbonate, it was decided to change the finish color. With this decision, by moving from the original transparent material to an ice white color, it was possible to reduce energy absorption. Because, being a light color with a high luminous reflectance value, it reflects a large amount of light and absorbs less thermal energy. In other words, by reducing the radiation that has passed through the polycarbonate, the elements inside the building heat up less. Well, once the energy has entered, the polycarbonate cover behaves like the gate of a heat trap, so that it allows energy to enter but not its exit (greenhouse effect), thus increasing the interior temperature of the building. Finally, another advantage that was achieved with this decision was that, by letting diffused light pass inside, the user's comfort conditions improved significantly because the reflections on the sports court decreased considerably. In conclusion, we can say that the drafting team of the project, choosing envelopes that, in addition to performing their enclosure function, improved its efficiency. They have managed to give greater added value to the building in addition to extending its useful life.