Ventilation of the underside of the roofing
Clay tile roofs

Ventilation of the underside of the tiles and their supports must be ensured. This ventilation is essential to ensure the long-term preservation of the tiles and their wood supports.

The space to be ventilated under the roof consists of :

• or through the volume of the attic if it is not occupied and the roof has no screen;

• or by the air space between the underside of the roof and its support, and the upper surface of the insulation or screen under the slope.

In addition, when installing a screen, the underside must also be ventilated.

Ventilation is provided by eaves and ridge vents connected to the exterior. Depending on the configuration of the roof, the total cross-sections of these ventilation openings are shown in the...