Air needs a path even when insulation fills the deck. This ventilation outlet uses a bonded bitumen skirt to seal into torch‑on membranes, then rises to promote air movement above the insulation layer. The design encourages circulation that keeps moisture migrating out rather than condensing, protecting thermal performance over time. Installers like the way the skirt fuses into the field to create a continuous, watertight perimeter—set the outlet, bond and move on with confidence. From street level the detail reads quiet, yet inside the roof build‑up it works steadily to remove trapped moisture and equalise vapour pressure. Use it on warm roofs, complex layouts and refurbishment projects where internal humidity meets cold surfaces. With the bitumen ventilation outlet you gain a discreet component that defends the envelope and helps the roof feel settled and durable through seasons.