Permavent Eco Breather Membrane 50m x 1.5m

  • One of the best performing breather membranes, offering superior strength, breathability, flexibility and durability.
  • Uniquely laminated for long-lasting durability, tear-resistance, and integrity.
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£67.50 Inc. VAT

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Product Details

Permavent Eco Breather Membrane: 50 x 1.5m

Permavent ECO (50m x 1.5m) is a top-quality breather membrane with a technical specification to back it up.

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.

This breather membrane has excellent water shedding and vapour transfer characteristics, keeping timbers dry, free from rot in both domestic and commercial environments.

Specification Value
Weight, g/m² 90
Water Tightness (Class) W1
Water Vapour Transmission (sd), m 0.02
Max Tensile Force (MD), N/50mm 200
Max Tensile Force (CD), N/50mm 110
Elongation at Max Tensile Force (MD) % 80
Elongation at Max Tensile Force (CD) % 60
Resistance to tearing MD (nail shank), N 90
Resistance to tearing CD (nail shank), N 125


Permavent Eco conforms several industry standards including BS 5534:2014, BS 5250, BS EN 1991 1-4 amongst others, and is CE Certified. Further details can be found in the data sheets below.

This roll is 50m x 1,5m with a coverage of 75m² and should be fitted in accordance with BS 5534:2014. Permavent Eco should be installed with the logo uppermost, horizontally across the roof.

Minimum Horizontal Laps

Rafter Pitch Not Fully Supported Fully Supported
12.5° - 14° 225mm 150mm
15° - 34° 150mm 100mm
35° and above 100mm 75mm


This breather membrane is suitable for use in wind zones 1-4 with both battened lap (250mm batten gauge) and taped lap.

Wind Zone Map

It can be used on cold roofs, cold vented roofs, traditional hybrid roof, and Scottish and Fully boarded applications. It is LABC assured.

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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