Breather

Breather membranes are installed to the outer side of the insulation – for example, either over or under the counter-battens on a pitched roof – and allow water vapour to escape from inside a building without the need for ventilation. They also repel any water, most commonly rain, that tries to enter the building. To ensure maximum efficiency, all joints in the membrane should be properly sealed with tape so as to prevent accidental air-leakage.