The predominant climate in most of Mexico is hot and sunny, divided between humid in the southern coastal areas and dry in the north. One of the most common materials used to build roofs today is reinforced concrete. This material allows a better use of the available space, but its thermal insulation characteristics are inadequate. This causes the levels of comfort inside the houses to be much worse than the minimum required. The current tendency to make better use of energy in buildings has led to the development of a new generation of roof coatings that offer a greater resistance to heat transfer.