Breathable Roofing Membrane
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Our WRAPTOR range of breathable roof membranes is designed for use as a roofing underlay beneath tiles and slates, providing reliable water resistance while allowing moisture to escape. Suitable for new roofs, re-roofing projects, extensions and outbuildings.
What is Breathable Roofing Membrane?
Breathable roofing membrane (also known as a breathable roof underlay or vapour permeable membrane) is a protective layer used in roofing systems to prevent water ingress while allowing trapped moisture to escape.
This helps to:
– Reduce condensation build-up
– Protect roof structures from damp and mould
– Improve the long-term durability of your roof
Our WRAPTOR membranes are manufactured to high standards and are fully BBA approved for use in UK roofing construction, including warm and cold roof systems.
How to Choose the Right Breathable Roofing Membrane
Choosing the correct membrane depends on your project type and exposure conditions:
100gsm Membrane – This is the best option for sheds, outbuildings and low-risk applications
120gsm Membrane – Ideal for most standard domestic roofing projects
140gsm Membrane – Heavy-duty option for exposed areas and high wind zones
If you’re unsure which breathable roofing membrane you need, contact our team for expert advice.
Our WRAPTOR Breathable Roofing Membrane Range
We supply a range of WRAPTOR breathable roofing membrane rolls in 100gsm, 120gsm, and 140gsm, available in multiple widths to suit your project. All rolls are 50m in length and available with free UK mainland delivery.
- – WRAPTOR 100gsm (1m x 50m rolls) – Lightweight and cost-effective for smaller roofing jobs
- – WRAPTOR 120gsm (1m and 1.5m x 50m rolls) – Versatile and suitable for most UK residential roofs
- – WRAPTOR 140 gsm (1m and 1.5m x 50m rolls) – Strong, durable membrane for demanding environments
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BBA Approved Breathable Membrane
Where Can Breathable Roofing Membrane Be Used?
Breathable roofing membrane is a versatile solution used across a wide range of construction and roofing applications. Designed to act as a breathable roof underlay, it provides reliable protection against water ingress while allowing moisture vapour to escape, making it suitable for both domestic and commercial projects.
Our breathable membranes are suitable for:
Pitched roofs – Installed beneath roof tiles or slates, breathable membrane acts as a secondary barrier against wind-driven rain while allowing the roof structure to ventilate effectively.
New builds and re-roofing projects – Ideal for modern roofing systems, breathable roofing membrane helps improve energy efficiency and protects roof timbers from moisture damage in both new builds and replacement roofs.
Extensions and renovations – Perfect for home extensions and refurbishment work, ensuring continuity of moisture control and protection across new and existing roof sections.
Sheds, garages and outbuildings – A lightweight breathable membrane (such as 100gsm) is commonly used to provide cost-effective protection for smaller structures and garden buildings.
Timber frame wall systems – Can also be used as a breather membrane in timber frame walls, installed behind cladding to protect against external moisture while allowing the structure to breathe.
Thanks to its vapour permeable properties, breathable roofing membrane helps prevent condensation build-up, reducing the risk of damp, mould and long-term structural damage across all of these applications.
Key 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 Breathable Roofing Membrane Work?
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 also to prevent debris from entering and causing damage. Often, a breathable membrane can also be used as a house wrap for the same reasons.
Roofing membrane is installed on the external side of the insulation to prevent any excess water from 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 membrane is not installed, the moisture accumulation could result in a weakening of the structure and damp is likely to occur.
The correct and most suitable thickness of the breathable membrane must be applied to the construction. See below for guidance on the usage of WRAPTOR roofing membrane in relation to wind uplift pressure:
| Wind Uplift Pressure | |||
| Underlay Type | 250mm Batten Gauge (batten restrained lap) | 345mm Batten Gauge (taped lap) | 250mm Batten Gauge (taped lap) |
| WRAPTOR 100 | Zones 1 to 2 | Zones 1 to 2 | Zones 1 to 5 |
| WRAPTOR 120 | Zones 1 to 3 | Zones 1 to 3 | Zones 1 to 5 |
| WRAPTOR 140 | Zones 1 to 3 | Zones 1 to 4 | Zones 1 to 5 |
How Do You Install WRAPTOR Breathable Roofing Membrane?
WRAPTOR breather membrane is designed for use in warm, non-ventilated and cold, ventilated and non-ventilated roofs. It must be installed following the relevant recommendations of the British Standards (BS 5534:2014, BS8000-0:2014 and Dbs8000-6:2013).
It is manufactured for use in timber frame construction and must be installed under 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 Pitch | Horizontal Laps (mm) Untaped and Taped | ||
| Not Fully Supported | Fully Supported | Vertical Laps (mm) | |
| 12.5 – 14 | 225 | 150 | 100 |
| 15 + | 150 | 100 | 100 |
Fast Fact FAQ:
WHAT IS BREATHABLE ROOFING 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 ROOFING 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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