Proctor Air, an air and vapour permeable pitched roof breather membrane, is a high-performance solution for pitched roof applications, combining precision engineering with a number of impressive features. With an Sd-value of 0.02m and a vapour resistance of 0.1 MNs/g, this mem... Read More
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Proctor Air, an air and vapour permeable pitched roof breather membrane, is a high-performance solution for pitched roof applications, combining precision engineering with a number of impressive features. With an Sd-value of 0.02m and a vapour resistance of 0.1 MNs/g, this membrane ensures reliability as a versatile vapour-permeable solution.
Ensuring optimal airflow and moisture diffusion through the roof, this fully air-permeable membrane minimises condensation risks, making it an effective choice for various applications, even when moisture levels are particularly high, such as during a building's drying-out period. Highly water-resistant with a W1 rating under EN13859-1, it boasts a Hydrostatic Head of water surpassing 1m and features a hydrophobic additive in all three layers, allowing exposure for up to four months, offering the building envelope temporary weather protection.
Meeting and exceeding BS5534 wind uplift standards through third-party testing, Proctor Air is suitable for all wind zones (1-4) in the UK and does not require tape. Innovatively designed, Proctor Air provides superior airflow through non-ventilated roofs compared to those following BS5250 standards, eliminating the requirement for costly ventilation hardware. Additionally, the membrane's installation negates the need for a vapour control layer in non-ventilated cold, pitched roof constructions, streamlining the process.
Question:
Hi, I am wondering if I need one or two 50m rolls. I have a small Apex roof - length gable to gable 7m, height eaves to ridge 2.4m, 30-degree pitch. Many thanks. Andy
Answer:
Hi Andy, To calculate the amount of breather membrane you'll need for your roof, you can use the following formula: 2 x (Length of the roof x Height of the roof). Given your roof dimensions, the calculation would be 2 x (7m x 2.4m), which equals 33.6 square meters. The A Proctor Group Air & Vapour Permeable Pitched Roof Breather Membrane comes in 50m x 1m rolls, which provides 50 square meters of coverage. Based on your roof's size, one roll should be sufficient for your needs with some left over. Please note that this is an approximation and actual amount may vary based on factors such as overlap and waste. Always consult with a professional if you're unsure about measurements.
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