According to the Morphology of Structures the roofs are structures that are defined by the shape, observing the characteristics of function and architectural style of the buildings. The main functions of the roofs are the protection of the buildings, against the action of the weather, attending to the utilitarian, aesthetic and economic functions. Actually, the coverages must meet the following conditions:
A) utilitarian functions: impermeability, lightness, thermal and acoustic insulation;
B) aesthetic functions: shape and harmonic aspect with the architectural line, dimension of the elements, texture and color;
C) economic functions: cost of the solution adopted, durability and easy conservation of the elements.
All of the possible coverings types and their basic advantages or disadvantages are showed in the gallery and more in the link bellow.