Planning a roof is a big responsibility, as it is such an important part of any building. When planning, the technician in charge must consider the framing and location of the building, as well as the materials to be used.

The most common anomalies resulting from incorrect planning are:

Roof inclination

The roof tile maker should always provide the minimum requisites regarding inclination for each tile type, area and exposure profile.

However, roof inclination might also present problems stemming from the building plan itself.

  • Insufficient Inclination

Insufficient inclination leads to poor rainwater draining, which could lead to infiltration problems. It will also favour the accumulation of rubbish, moss and other elements that might impair the proper functioning of a roof.

The roof tile maker should always provide all relevant information regarding inclination with its products, but the architect or technician designing the roof should also state this information clearly in the project blueprints.

  • Excessive inclination

If the roof is designed to have a steep pitch, the architect or technician designing it should also plan how to fixate the composing elements of the roof, so as to avoid their fall as a result of gravity or other external factors, such as wind.

Roof Ventilation

Lack of proper ventilation is one of the most common anomalies found in roofing work.

Air circulation should always be carefully planned when designing a roof (for more details, please refer to the section regarding roof ventilation for each tile type: Lusa, Marselha, Canudo and Milénio).

The roof project plan should include the number of ventilation tiles to be applied on the roof, as well as their exact location, so that no doubts regarding this matter arise when laying them.
Without ventilation or with insufficient ventilation the roof might suffer from:

  1. Peeling from the frost-defrost cycle;
  1. Premature appearance of moss;
  1. Proneness to condensation;
  1. Rapid degradation of support elements and other accessories.

Without ventilation a roof will quickly degrade and present serious functional problems.

Geometry of Structural Elements

Proper calculation of structures is fundamental at the planning stage. The structure will have to withstand not only its own weight but also the effect of climate variation for the entirety of its usable existence.

It is not uncommon to see a roof with deformations along one or more of its sides. These deformations are usually the result of structural deficiencies and will seriously compromise the roof itself. Deformed areas will have openings and misaligned roof tiles which will lead to the infiltration of water and other elements