2.1 – Roof stratigraphy – 6. Controlled diffusion roof 84 Example of application in roofs with steel and corrugated sheet load-bearing structure The excess water vapor below the breathable membrane can return into the internal environment. The excess water vapor in the internal environment is screened by the vapor braking membrane. 1. zintek® standing seam roof cladding 2. Acoustic insulation draining filament mat 3. Grooved wooden board 4. Ventilated panel made with wooden battens 5. Breathable waterproofing membrane 6. Thermal and acoustic insulation 7. Hygrosensitive membrane THERMO-HYGROMETRIC BEHAVIOR OF THE ENVELOPE Thedifferent climatic conditions in summer andwinter greatly affect the thermo-hygrometric behaviors of the insulation packages and the structures of buildings. In winter, when the indoor temperatures (between 20° and 25°) are usually higher than the outdoor ones, the pressure difference pushes the humidity of the internal environment outside through the roof package. On the contrary, in summer, humidity tends to enter the building. The hygrometric behavior of the envelope is therefore affected by the building’s geographic position, the external and internal environmental conditions, the difference in temperature between day and night and the degree of production of humidity in the indoor environments. The water vapor is discharged thanks to the ventilated cavity. At the points where the insulation is not optimal, any excess water vapor can move towards the ventilated cavity. 1 2 3 4 5 6 7 EXCERPT
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