The structure was done using 4 mortar pillars, also with reinforcing bars, one in each edge of the cubicle. The base consists of a mortar base of 3×3 meters with crushed stones and reinforcing bars. The walls consist of perforated bricks (29x14x7.5 cm, Fig. 2) with an insulating material (depending on the cubicle) on the external side and plaster on the internal side. The external finish was done with hollow bricks and a cement mortar finish. Between the perforated bricks and the hollow bricks there is an air chamber of 5 cm. The roof was done using concrete precast beams and 5 cm of concrete slab. The internal finish is plaster. The insulating material is placed over the concrete, protected with a cement mortar roof with an inclination of 3% and a double asphalt membrane.

Three cubicles using different insulating materials are compared:

1. Reference cubicle: This cubicle has no insulation.

2. Polyurethane cubicle: The insulation material used is 5 cm of spray foam polyurethane.

3. PCM cubicle: The insulation used is again 5 cm of spray foam polyurethane and an additional layer of PCM. CSM panels (Fig. 3) containing RT-27 paraffin are located between the bricks and the polyurethane (in the southern and western walls and the roof).

The most important properties of the insulation materials and the PCM are shown in Table 1 and Table 2.

From Fig. 4 to Fig. 6 it is shown the demonstration cubicles built with brick, polyurethane, mineral wool, polystyrene and with brick, RT-27 PCM and polyurethane.