The system according to the invention is composed, on the one hand, of an enclosed faitiere 2 in the form of a half - with the edges lateral comprise means for fastening 13 on the two slopes of the roof and which comprises in addition, a succession of openings 6 intended to ensure that the air outlet, as well as a succession of transverse ribs 7 drawn toward the packaging, and, on the other hand, an outer faitiere 1 in the form of a half - which comes to rest and is fixed on the enclosed faitiere 2 at the level of the ribs 7. / p & & p & the invention applies in particular to the covers in the flat elements, such as slates or shingles.
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