Proctor Air - Vapour Permeable Membrane - 1M x 50M (50 sqm)

Proctor Air is a high-performance, air and vapour-permeable breather membrane designed to enhance the thermal efficiency and condensation control of pitched roofs

Proctor Air® from Proctor Group Ltd is a revolutionary air and vapour permeable roofing underlay engineered for modern roof construction. This advanced roofing underlay acts as an external air barrier, significantly improving the thermal efficiency of the building envelope while effectively managing moisture vapour. Its unique properties make it a superior alternative to traditional vapour barrier and air barrier systems. Installing Proctor Air means that a vapour control layer is not required for nonventilated cold pitched roof constructions.

Proctor Air has an Sd-value of 0.015m and a vapour resistance of 0.075 MNs/g making Proctor Air one of the highest performing vapour-permeable membranes on the market.   

Key Features & Benefits 

• Advanced Condensation Control: As a uniquely air and vapour-permeable material, Proctor Air allows natural air movement through the roof, as well as allowing moisture to escape by diffusion. This means that condensation is far less likely to form on the membrane itself, and also allows the membrane to deal with much higher moisture levels within the building, for example during the drying out period. 

• Superior Energy Efficiency: By functioning as a high-performance air barrier, Proctor Air drastically reduces air leakage, a primary cause of heat loss in pitched roofs. This allows the thermal insulation to perform at its maximum potential without the need for air gaps or extensive ventilation hardware.

• Exceptional Water Resistance: Proctor Air is rated W1 under EN13859-1, and has a hydrophobic additive in all 3 layers. It is capable of withstanding a significant hydrostatic head of water. It serves as a dependable water resistant roofing underlay that can be left exposed to provide temporary weather protection to the building during construction.

• Optimised Vapour Permeability: Proctor Air has an extremely low vapour resistance (with an Sd-value of 0.015m ). This high vapour permeability ensures that moisture within the roof construction can easily escape, promoting a faster drying out period and maintaining low moisture levels. 

Applications:

• Proctor Air is the ideal permeable underlay for a variety of pitched roof applications, especially for non-ventilated cold pitched roofs and complex pitched roofs where achieving adequate cross-ventilation is challenging.
• It simplifies construction by removing the requirement for secondary ventilation, making it a cost-effective and efficient solution.