Ventilation Outlets are used to allow moisture to escape from unventilated warm roofs. Moisture can get trapped within the roof during construction, if ventilation is not provided, heat from the sun can cause gases to expand, which in turn can cause blistering and tearing of the roof membrane.
Breather vents: these are designed to create air circulation above the insulation layer to remove moisture and condensation on the underside of the waterproof layer
As a renovation vent: for safe repair to old or damaged vents
For drying out roofs after construction or renovation to prevent formation mould, rot and surface blisters