Proctor Air® - Air & Vapour Permeable Membrane 50m x 1m

The Proctor Air 1m x 50m is a high-performance, air-permeable roofing underlay designed to "supercharge" moisture escape in pitched roofs. Engineered by the A. Proctor Group, this membrane features a unique meltblown core that allows natural air movement, making the formation of condensation virtually impossible—even in complex, non-ventilated roof designs. 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. Cost-Efficient Installation: When used in non-ventilated cold pitched roofs, Proctor Air often negates the need for a Vapour Control Layer (VCL) and secondary ridge/eaves venting. Fully Compliant: Third-party tested for wind uplift resistance, it complies with BS 5534 for all UK wind zones without the need for additional tape in zones 1-4. Solar Ready: Fully compatible with integrated Solar PV assemblies, as noted in its latest BBA certification. More uniform airflow than vents. No VCL required. Compatible with PV Assemblies. EPD Certified. 15 year warranty. Specifications Length: 50m Width: 1m / 1.5m Weight: 170g/m² Coverage: 50m²/ 75m² Material: Polypropylene Spunbond, Meltblown, Spunbond laminate Breathable: Yes Colour: Purple Type: Air & Vapour Permeable Pitched Roof Underlay Certifications Met: BBA Certified