6.1 – Ventilated façade stratigraphy – 5. Protection against the spread of fire on ventilated façades 355 Window soffit with metal fire barrier and front ventilation. Window soffit without fire barrier and with ventilation from below: the flames propagate inside the ventilated cavity. Galvanized steel or stainless steel fire barrier, min. thickness 1.0 mm. D1 Horizontal and/or vertical fire barriers in the ventilated cavity can also be installed on each floor or on each second floor, based on the fire risk assessment. According to the FVHF regulation and the DIN 18515-1 standard, the total size of the openings in the fire barriers must be limited to 100 cm²/m of wall. Fire barriers guarantee the interruption of the propagation of the fire for 30 or 60 minutes, depending on the type of application and the characteristics of the system used. The open width of the ventilated cavity must not exceed 50 mm for façades with a wooden substructure and 150 mm for façades with a metal substructure. EXCERPT
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