Roofing Membrane

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Our WRAPTOR breathable roofing membrane has full BBA approval for use in roofing construction. Use as a roofing underlay and within timber-frame walls. Available for a variety of uses in:

  • – 100gsm (1m x 50m rolls)
  • – 120gsm (1m and 1.5m x 50m rolls)
  • – 140 gsm (1m and 1.5m x 50m rolls)

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BBA Approved - Certificate No.

BBA Approved Breathable Membrane

What is Breathable Roof Membrane?

WRAPTOR breather membrane is a three layered thermal lamination cover that provides a high level of water resistance, whilst allowing any excess moisture to be released to avoid mould and condensation. Breather membrane is a water resistant material mainly used in roofing construction and timber frame construction to prevent water from getting in; however, it can often be used as a house wrap, for extra coverage.

WRAPTOR  is fully BBA approved for use in warm non-ventilated and cold ventilated and non-ventilated roofing construction, along with timber frame construction; providing UV resistance for up to 3 months.

Roofing membrane can be used as a roofing underlay and within timber frame walls with a cavity and masonry outer leaf, weatherboarding or tile/slate cladding. It has a good tensile strength and tear resistance and is incredibly durable.

WRATOR is available in 100gsm, 120gsm and 140gsm. The 100gsm membrane is available in a 1m roll and the 120gsm and 140gsm range is available in two lengths, 1m and 1.5m.

Benefits of Breathable Roofing Membrane

  • Fully BBA approved for use in warm non-ventilated and cold ventilated and non-ventilated roofing construction; along with timber frame construction
  • Extremely durable; excellent tensile and tearing strength
  • Brilliant water resistance and vapour permeability
  • Great UV resistance for up to 3 months

How does roofing membrane work?

Breathable roofing membrane is used within the construction industry; it is installed externally on buildings mainly to create a water-tight and vapour permeable layer for roofs but to also prevent debris from entering and causing damage. Often, breathable membrane can also be used as a house wrap, for the same reasons.

Roofing membrane is installed to the external side of the insulation to prevent any excess water currently or potentially getting through and damaging the structure. As the breathable membrane is vapour permeable, it allows ventilation and stops condensation from occurring and building up. If the breathable membrane is not installed, the moisture accumulation could result in a weakening of the structure and damp is likely to occur.

It is important the correct and most suitable thickness of the breathable membrane is applied to the construction. See below for guidance on the usage of  WRAPTOR in relation to wind uplift pressure:

Wind Uplift Pressure
Underlay Type250mm Batten Gauge (batten restrained lap)345mm Batten Gauge (taped lap)250mm Batten Gauge (taped lap)
WRAPTOR 100Zones 1 to 2Zones 1 to 2Zones 1 to 5
WRAPTOR 120Zones 1 to 3Zones 1 to 3Zones 1 to 5
WRAPTOR 140Zones 1 to 3Zones 1 to 4Zones 1 to 5
Map of the UK showing the wind pressure zones

How to install WRAPTOR breathable roofing membrane

WRAPTOR is for use in warm non-ventilated and cold ventilated and non-ventilated roofs must be installed in accordance with the relevant recommendations of the relevant British Standards (BS 5534:2014, BS8000-0:2014 and Dbs8000-6:2013).

WRAPTOR breathable roofing membrane for use in timber frame construction must be installed in accordance with the recommendations given in NHBC Standards, Chapter 6.2, where appropriate.

These products are designed to be installed by competent installers experienced in using breathable membrane products.

WRAPTOR should be installed with the coloured side facing up and lapped to shed water out and down. Overlaps must be provided with the minimum dimensions given in the table below:

Roof PitchHorizontal Laps (mm) Untaped and Taped
Not Fully SupportedFully SupportedVertical Laps (mm)
12.5 – 14225150100
15 +150100100

Fast Fact FAQ:

WHAT IS BREATHER MEMBRANE?

Breathable roofing membrane is a vapour permeable layer used in construction to help create a watertight roof.

IS BREATHABLE ROOFING MEMBRANE WATERPROOF?

Yes, WRAPTOR breather membrane is waterproof. It also allows for any moisture to pass while preventing any condensation build up.

WHAT THICKNESS IS WRAPTOR BREATHABLE MEMBRANE AVAILABLE IN?

100gsm, 120gsm (available in 1m and 1.5m width rolls) and 140gsm (available in 1m and 1.5m width rolls). All our rolls come are 50m in length.

HOW MANY ROLLS OF ROOFING MEMBRANE DO I NEED TO BUY

To find out the approximate amount of roofing membrane you need to purchase for your project, please either contact us or get an estimate from our roofing membrane calculator >>

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