Membrane roofing is applied totally on reduced pitched roofs wherever shingles, slate or tiled roofing wouldn't be effective. Soffit vents: Perforated soffit is the simplest way to get air flow at the soffit. Should your soffit (the area underneath the eaves) is strong, then specific vents need to be installed. https://beckettfntyc.mappywiki.com/796465/facts_about_oswego_revealed