Proctor Air® is an air and vapour permeable, highly water resistant roofing underlay. Its characteristics allow even very complex pitched roofs to breathe, without the need for air gaps or secondary venting.
The high performance meltblown core at the heart of Proctor Air® allows natural air movement to ‘supercharge’ the passage of moisture vapour from the roofspace, making the formation of condensation in the roofspace virtually impossible.
- Vapour permeable
- Fully air permeable
- Highly water resistant
- More uniform airflow than vents
- Wind Uplift Resistance Complies with BS5534
- No VCL required
- 15-year warranty
Proctor Air® – Next Generation Air & Vapour Permeable Membrane
Vapour Permeable
Proctor Air has an Sd-value of 0.02m and a vapour resistance of 0.1 MNs/g, making Proctor Air one of the highest performing vapour-permeable membranes on the market.
Fully Air Permeable
Air permeable membranes allow 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.
Highly Water Resistant
Proctor Air is rated W1 under EN13859-1, and has a hydrophobic additive in all 3 layers. The membrane can be left exposed to provide temporary weather protection to the building envelope for up to four months.
More Uniform Airflow than Vents
The air permeability of Proctor Air means a non-ventilated roof fitted with Proctor Air allows a more consistent air flow through the roof than a roof ventilated as per BS5250, without expensive and time consuming ventilation hardware fitted to the roof.
No VCL Required
Installing Proctor Air will mean that a vapour control layer is not required for non-ventilated cold pitched roof constructions.
15 Year Warranty
Proctor Air’s 15-year warranty provides peace of mind on any project.
Why Proctor Air®?
Proctor Air® is a vapour and air permeable underlay (VPU) for pitched roof applications. While the majority of VPUs in use today utilise an airtight, vapour permeable, film layer to achieve their performance, Proctor Airs’ SMS (Spunbond Meltblown Spunbond) structure allows high levels of airflow in addition to the transport of moisture vapour, making the formation of condensation virtually impossible.
Independent studies of the effect of air permeability have confirmed that lofts using air permeable underlays have more consistent air-flow through the roof than those found in traditionally ventilated lofts, according to BS5250, so whatever side of the vents/no vents debate you sit on, Proctor Air has it covered.
Its heavyweight 170gsm three-layer structure also containing a hydrophobic in every layer, gives a Class W1 rating under the latest EN13859-1 specifications.
Proctor Air – Technical Support
Our products are backed up by a dedicated team of technical experts, able to assist at every project stage from pre-planning to on site. We offer CAD detail reviews, installation guidance, condensation risk analysis, WUFI calculations, U-Value calculations, ground gas system designs, telephone support & more. Our products also have a range of BIM Objects & Performance Specifications.