Proctor Air® - air and vapour permeable, highly water resistant roofing underlay.
by A Proctor Group
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
Key Features
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 three 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.
Specification Details for Proctor Air® - air and vapour permeable, highly water resistant roofing underlay. (Breather Membranes)
Please note that these product properties are not a replacement for the manufacturer's literature and it is always recommended that A Proctor Group is consulted before specifying.
Certifications & Ratings
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| BBA Certificate Number (?) | 24/714 | |
| CCPI Assessment Mark (?) | ||
| CCPI Assessment Number (?) | 007400168/027 | |
| CE Marking (?) | ||
| Reaction to Fire (?) | Class E | |
Technical
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| Features (?) | fully air permeable , Highly water resistant , Vapour permeable | |
| Resistance To Water Penetration (?) | W1 | |
| Water Vapour Resistance (?) | 0.075 MNs/g | |
| Water Vapour Resistance SD (?) | 0.015 m | |
Other
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| Uniclass (?) | Pr_25_57_10 Building papers and vapour permeable sheets | |
File Downloads for Proctor Air® - air and vapour permeable, highly water resistant roofing underlay.
While “Breathability” is a commonly used term, it is more technically accurate to refer to a material’s “vapour permeability”.
As Proctor Air is air permeable as well as vapour permeable, it can certainly be argued that it does breathe, as it allows air
movement, but this does not hold true for all “breathable” materials. In terms of vapour permeability, Proctor Air, with an Sd value 0.02m and a vapour resistance of 0.1MNs/g, is one of the most vapour permeable membranes on the market, as well as benefitting from the additional advantage of air permeability.
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