An air tight membrane can be used to combat draughts. A thin membrane can be fitted within walls, roofs and even floors to reduce the air that flows through them. To ensure ‘air tightness’ these membranes must be fitted with no gaps to ensure that the external envelope of the house is sealed. It is not easy to retrofit an existing house with a membrane, it is much easier to install during construction.
All Green Doors homes with an air tight membrane ensure ventilation through a Mechanical Ventilation and Heat Recovery (MVHR) system.