Breather Membranes

Breather membranes are specialised building materials used primarily in roofing and wall construction to provide a weather-resistant barrier that allows the passage of water vapour while preventing the ingress of liquid water and wind-driven rain. They play a crucial role in maintaining the durability and energy efficiency of buildings by managing moisture and protecting structural elements.

Function

• Waterproof yet Vapour Permeable: Breather membranes are designed to be impermeable to liquid water, stopping rain and snow from penetrating the building fabric. Simultaneously, they allow water vapour generated inside the building to escape, preventing condensation build-up within the structure.
• Windproof Barrier: By blocking wind, breather membranes reduce heat loss and prevent drafts, contributing to improved thermal performance.
• Durability: Made from robust synthetic materials such as polypropylene or polyethylene, these membranes resist tearing and degradation from UV exposure during installation.

Benefits

• Moisture Management: By allowing vapour to escape, breather membranes help maintain a dry and healthy building environment, reducing the risk of structural damage and mould growth.
• Energy Efficiency: By preventing drafts and moisture ingress, they contribute to better insulation performance and lower heating costs.
• Ease of Installation: Lightweight and flexible, breather membranes are relatively easy to install and can be cut to fit various building shapes.

Applications

• Roofing: Installed beneath roof tiles or slates, breather membranes protect the roof structure from moisture ingress while allowing trapped moisture to escape, reducing the risk of rot and mould in timber rafters and insulation.
• Wall Construction: Used in timber frame and masonry walls, they act as a secondary weather barrier, preventing rain penetration while allowing moisture vapour to pass outwards.
• Renovation Projects: Breather membranes are often used in retrofit projects to improve the weather resistance and breathability of older buildings.