For the thermal measurements, all the samples were assem-bled with external dimensions 1230 × 1480 mm, for a total areaof 1.82 m2. The dimensions were chosen considering the limits of the experimental apparatus. Modular PC panels for roofing, parti-tions or windows have a total maximum width of 435 mm, so three modular elements (1.48 m high) were joined, in order to obtain the correct dimensions for the sample. This condition is very similar to the real installation: the thermal performance measured in lab-oratory condition could be compared to the in situ performance(Fig. 4)