2.1 – Roof stratigraphy – 8. Waterproofing 94 Waterproofing below the roof cladding is necessary in the case of: • slightly sloping roof; • roofs in mountainous climates in accordance with standard UNI 10372; • roofs with a slope that is less than that contemplated by the cladding system in use (standing seam cladding with zones of the roof with slope < 3°; cladding with standard shingles with roof slope < 25°; cladding with staggered panels with roof slope < 12°); • roofs with snow load at ground level qs ≥ 3.20 KN/m2; • areas with snow accumulation risk. Fully sealed impermeable attic membrane Hot welding of the breathable waterproofing membrane guarantees perfect waterproofing, airtightness and windproofing because it seals the overlaps and gaps. The membrane is coated on both sides with a hot-weldable synthetic film. The longitudinal edges of the coil are sealed to prevent water rising upwards through capillarity through the central polyester mat. It is important to install only products whose technical datasheet indicates their use for a specific roof slope. A continuous tape seal must be used to guarantee sealing at the fixing points of the battens. Another continuous tape waterproofing of the ventilation batten tape must be used to raise the piercing point of the waterproofing membrane above the water flow plane. Ventilated cavity with metal tubular profile, overlapped waterproofing membrane and interposed seal. Ventilated cavity with double wooden battens, overlapped waterproofing membrane and interposed seal. MONO-ADHESIVE BYTYL TAPE SEAL CONTINUOUS TAPE SEAL EXCERPT
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