All testing methods to determine conformity with the technical specifications defined can be found in norm NP EN 1024.

The compliance of roof tiles with these requirements is essential to the correct execution of roofing work.

Dimensions

The dimensional stability of pieces is one of the key aspects of their individual characteristics. In the case of longitudinal and transversal fitting roof tiles, the stability of length and width must be ensured. A dimensional variation of ± 2% over the values declared by the maker is, however, acceptable.

In lieu of individual values, the maker can declare the coverage area dimensions. In this case, the average measured value must not present a deviation of more than ± 2% over the values declared by the maker.

Planarity

Planarity is one of the main characteristics regarding the regularity of the shape of products. The planarity coefficient is expressed in percentage. The maximum allowed values for the planarity coefficient are 1,5% and 2,0%, depending on whether the roof tile length is superior or equal to 300mm or inferior to 300mm, respectively.

This however does not apply to Canudo roof tiles, whose uniformity is not measured in terms of planarity, but rather by their transversal profiles, i.e., the measurement of the width of tiles at their narrower and wider sides. In both cases, the difference between the largest and smallest width values must not exceed 15mm.

Linearity

Linearity is another key characteristic of pieces. The maximum admissible values for the linearity coefficient at 1,5% and 2,0%, depending on whether the roof tile length is superior or equal to 300mm or inferior to 300mm, respectively.