Suitable for use in new-build and retrofit projects for roofs and walls.


Reflective coated breather membrane for use on roofs and walls.

Features and benefits:

  • Has a reflective thermal advantage over standard breather membranes, and can therefore be used to enhance thermal performance.
  • Vapour permeable, and allows the passage of warm moist air to reduce condensation.
  • Will contribute to the airtightness of a building.
  • Easy to handle and install.
  • Manufactured with 40% recycled materials and is recyclable at the end of its useful life.
  • Watertight to EN 1928: 2000, and provides a secondary rain barrier.
  • Can be used to help meet the requirements of Approved Document Part L and Scotland Part J.
  • Can be used on its own, in multiple layers or with varying forms of insulation to achieve any U-value.
  • CE marked, and manufactured in accordance with BS EN 13859.
  • Approved for Building Regulations by UK Certified Test laboratories - consult manufacturer for details.


Reflective coated breather membrane.


Suitable for use in new-build and retrofit projects for roofs and walls.

General information

Uniclass 2015

Pr_25_57_10_94 Vapour permeable sheetsPrimary


H21/130 Breather membrane

H21/20 Breather membrane

H22/130 Breather membrane

H22/20 Breather membrane

H30/350 Breather membrane

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Specification data - Vapour permeable sheets

Product Reference


Roll length

25 m

50 m

Standard product features

Roll width:

1.5 m.


>1 mm.


5.4 kg per roll.

Total area coverage:

37.5 m² per roll.

Thermal performance (R-value):

  • Roof: 0.29 m²K/W.
  • Wall: 0.366 m²K/W.

Technical characteristics:

  • Water vapour resistance: 0.115 MNs/g.
  • Resistance to water penetration: W1.
  • Water vapour transmission: 0.023 sd.
  • Nail tear strength: 179 N.
  • Tensile strength: 194 N/50mm.
  • Emissivity: 0.3.
  • Reaction to fire (Euroclass): Class E (behind plasterboard).

Third party certifications
  • Declaration of Performance (DoP): 001-BD-CPR-16-03-16 : To EN 13984: 2014