The air vents are installed to lead both the residual dampness under waterproofing to the atmosphere and dampness from living premises. They prevent blisters forming in the waterproof membrane as well unbonding of the waterproofing membrane etc. The air vent itself does not reduce the quality of the waterproof membrane and its waterproofing property. The air vent prevents the inconvenience to lose the waterproofing properties.
Air flats for flat roofs