PCMs placed on the roof are able to absorb part of the incoming solar energy and thermal energy from the surrounding environment, thus reducing temperature fluctuations in the indoor environment [1]. [PERSON] et al. [17] carried out a detailed experiment, which lasted a full year, to analyze the thermal performance of the roof of a building that incorporated PCMs in Chennai, India. The experiment involved two identical test rooms to study the effects of PCM panels on the roof of the building. One of these rooms was constructed without PCM on the roof in order to have a reference case for comparison with the experimental room that included the phase change material. The results show that the PCM panel on the roof narrowed the indoor air temperature swings. The adopted solution performed well throughout all the seasons, especially when the top panel had a 6-7 \({}^{\circ}\)C higher melting temperature than the indoor temperature in the early morning during the peak summer month, and the bottom panel had a melting temperature near the desired ambient temperature. [PERSON] et al. [18] conducted an experiment on the concrete roof of a building with vertical cylindrical holes containing PCMs with the goal of reducing the heat flux from outdoors to the indoor space by increasing the thermal mass of the roof. A numerical model was validated though the experimental data and it allowed the effectiveness of the PCM in the roof to be demonstrated. Moreover, the simulations demonstrated that the heat gains could be reduced significantly with larger PCM hole diameters. In recent years, other studies have been carried out to demonstrate how the application of phase change materials to the roof of buildings contributes to reducing the thermal loads and consequently the energy consumption of the building, especially during days with high solar radiation. [PERSON] et al. [19] conducted an experimental investigation to reduce the internal temperature of a single-story industrial building with a metal roof through the help of a PCM. A scale model of the proposed building was fabricated and tested. The test results showed that the PCM significantly reduced the roof temperature and consequently the indoor temperature. Quantitatively, the daily average internal temperature was lowered by 5 \({}^{\circ}\)C and the peak internal temperature was decreased by 9.5 \({}^{\circ}\)C as a result of the application of the PCM. [PERSON] et al. [20] investigated a PCM on a roof and found that the maximum interior surface temperature was reduced by up to 8.75 \({}^{\circ}\)C. On the basis of these results and findings, the authors stated that the application of a PCM to a roof could effectively reduce the heat transfer through the building components and contribute to building energy saving. [PERSON] et al. [21] focused their study on the application of a PCM combined with a fiber cement roofing sheet (40\({}^{\circ}\) slope angle) to reduce heat transfer through a building. By composing four different configurations (two of which included a PCM), they observed an interior temperature reduction of 1.5 \({}^{\circ}\)C (from 26.8 \({}^{\circ}\)C to 25.3 \({}^{\circ}\)C) in the room where the PCM was added. In most of the above-mentioned applications, the PCMs were incorporated through the microencapsulation technique. However, an easy integration of a PCM with building elements can also be obtained by means of the macro encapsulation technique [12]. Nevertheless, the adoption of metal or polymeric envelopes/cases for encapsulation purposes could lead to an alteration of the equivalent thermal properties of the PCM (e.g., a non-homogeneous distribution of the PCM, air gaps, thermal bridges), if compared with the bulk PCM properties. Until now, the main laboratory test used to measure the properties of PCM has been Differential Scanning Calorimetry (DSC), according to ASTM E793-06 [22], as indicated in the E793 and E967 standards.