Permavent BLACK: 50m x 1m

  • One of the best performing breather membranes, offering superior strength, breathability, flexibility and durability.
  • Top of the range performance, suitable as a breather membrane for all domestic and commercial applications.
  • Uniquely laminated for long-lasting durability, tear resistance and integrity.
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£47.50 Inc. VAT

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Free Delivery for orders over £50 

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Product Details

Permavent BLACK Breather Membrane (50m x 1m)

Permavent Black is a top-quality Breather Membrane. It is suitable for all cold, warm, hybrid and boarded roof designs.

Permavent is manufactured using unique bonding techniques adapted from the medical industry. Permavent’s exclusive laminating processes produce a multi-layer membrane with incredible tensile strength and superior water vapour transmission. For long-lasting protection of roofing timbers, this underlay is hard to beat.

Permavent BLACK is also fully certified under the CE having been tested and certified by independent European laboratories and is only manufactured under the strictest ISO requirements. Permavent membranes are certified for use in all types of roofing and walling applications and conform fully.



Weight, g/m²


Water Tightness (Class)


Water Vapour Transmission (sd), m


Max Tensile Force (MD), N/50mm


Max Tensile Force (CD), N/50mm


Elongation at Max Tensile Force (MD) %


Elongation at Max Tensile Force (CD) %


Resistance to tearing MD (nail shank), N


Resistance to tearing CD (nail shank), N


Vapour resistance, MNs/g-1


Permavent BLACK conforms to several industry standards including BS 5534:2014, BS 5250, BS EN 13859 amongst others, CE Certified and assured by LABC. Further details can be found in the data sheets below.

This roll is 50m x 1m with a coverage of 50m² and should be fitted in accordance with BS 5534:2014. Permavent BLACK should be installed with the logo uppermost, horizontally across the roof.

Minimum Horizontal Laps

Rafter Pitch

Not Fully Supported

Fully Supported

12.5° - 14°



15° - 34°



35° and above



This breather membrane is suitable for use in wind zones 1-5 with taped lap and wind zone 1 with battened lap (250mm batten gauge).

Zonal Wind Map

Product Delivery

Ashbrook Roofing offers free delivery for orders over £50 to United Kingdom postcodes excluding the Highlands, Islands and Ireland.

Delivery expectation for orders placed before 2.00pm (Mon - Fri) are:

You pay: £4.95
Delivery: 2-3 working days
For orders placed before 2.00pm (Mon - Fri)

FREE Delivery   
On all orders over £50
Delivery: 2-3 working days
For orders placed before 2.00pm (Mon - Fri)

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Prior to shipment, we’ll let you know of our estimated date of delivery. Don’t worry if you have made other plans or find this inconvenient.

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And remember, if you need help, have any concerns, or require a more timely delivery of your product(s), then simply give our customer services team a call on 01629 828500.

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