Airtight Membranes

Choose an airtight membrane for your wall, roof or building-envelope project from the Insulation4Less range. Products include Proctor Wraptite self-adhesive, vapour-permeable air barrier membranes, Wraptite FZ and FramePro W1, alongside Reflectatherm Plus reflective vapour control layer and compatible Wraptite preformed corners. The collection also contains roof breather membranes, roof accessories and other specialist barriers, so check each product’s intended application before ordering.
Compare roll dimensions, substrate compatibility, vapour resistance and joint-sealing requirements. For example, Wraptite is listed in a 1.5 m × 50 m roll, while Wraptite FZ comes in 1 m × 50 m and 750 mm × 50 m formats. Select the membrane as part of a continuous, correctly detailed airtightness system rather than by roll size alone.

Browse Insulation4Less for a wide range of Airtight Membranes from top brands like Danosa, Danodren and Proctor. Give us a call if you need advice at 020 3582 6399

Airtight Membrane | Airtight Membranes

Airtight Membranes play a pivotal role in ensuring that buildings are not only insulated effectively but also protected from unwanted air infiltration, thereby contributing significantly to energy efficiency and creating a healthy living environment. The variety of products in the airtight membrane category on Insulation4Less spans a broad spectrum, enabling professionals and DIY enthusiasts alike to secure optimal solutions for their insulation needs.

Reflective Vapour Control Layers

Reflectatherm Plus Reflective Vapour Control Layer is a prime example of innovative membrane technology from PROCTOR, providing not just airtightness but also managing the movement of moisture through building assemblies. Especially pertinent for walls and roofs, this layer minimises the risk of condensation, enhances energy efficiency and provides a high level of thermal insulation.

Corner Solutions for Enhanced Airtightness

Wraptite Preformed Airtight Corners offer specialised solutions for ensuring airtightness in those tricky and often neglected corner areas, where sealing efficiently can be a challenge. Whether window corners or other junctions, these preformed airtight corners contribute to comprehensive and robust airtight barrier systems.

Vapour Permeable Membranes

Noteworthy here is Wraptite’s Self-Adhesive Vapour Permeable Air Tightness Membrane, offering the dual benefit of airtightness and vapour permeability. This product ensures the reduction of air leakage, while also allowing for the safe escape of vapours, ensuring durable, effective insulation and avoiding condensation-related issues.

Torch-On SBS Membranes from DANOSA

With products like the Danosa Torch On SBS Underlay and Danosa Trade Torch On SBS Mineral Cap SheetDANOSA offers reliable torch-on solutions. They typically serve dual functions, acting as waterproof barriers and providing reliable adhesion to prevent uplift of the layers in windier climates.

Extensive Airtightness with FramePro

The FramePro W1 Air Barrier is tailored for extensive airtightness in wall systems. With its particular formulation, it provides a robust barrier against the external environment, making sure that the insulation within the wall structure is safeguarded against moisture and air infiltration.

Specific Solutions for Various Membrane Needs

Wraptite FZ Membrane and Eolis HC provide varied solutions, ensuring they meet the specific requirements of different application contexts. With diverse size options and characteristics, these membranes are tailored to meet the nuanced demands of different building assemblies and insulation needs.

Advanced Solutions with StrataShield and Novia

Products like StrataShield Self Adhered Aluminium Faced AVCL and 1600 Gauge Radon Barrier from NOVIA present advanced solutions in the realm of vapour and radon control, delivering exceptionally high performance in managing air and vapour permeability while ensuring robust radon protection.

Breathable Membranes and Repair Solutions

Including offerings like Breathable Membranes - BBA 140 and Membrane Repair Tape, ROOFTEC provides both preventative and reactive solutions. The BBA certified breathable membranes ensure quality and reliability, while the repair tape allows for robust, lasting repairs to existing membrane installations.

Adaptable Membranes for Walls and Roofs

Black+ from NOVIA provides a range of adaptable, breathable membranes suitable for both roofs and walls. Available in various configurations and as a DIY Kit, these membranes offer versatility and a high degree of adaptability to various installation contexts.

Choosing the right air barrier for walls and roofs

An airtight membrane helps limit uncontrolled air movement through the building envelope. The intended position matters: some products are installed externally as vapour-permeable air barriers, while others form an internal vapour control layer. Airtightness and vapour resistance describe different properties. A membrane may resist air leakage while still allowing water vapour to diffuse through it.

Proctor Wraptite is listed as a self-adhesive, vapour-permeable air tightness membrane in a 1.5 m × 50 m format. It is relevant when a continuous external air barrier is specified. Wraptite FZ is available in narrower roll formats, which may suit particular detailing or façade applications subject to the manufacturer’s installation instructions. FramePro W1 is another listed Proctor air barrier; check its technical literature for the specified assembly before treating it as interchangeable with Wraptite.

For an internal layer, the listed Proctor Reflectatherm Plus is a reflective vapour control layer. Its purpose and position differ from a vapour-open external membrane. StrataShield self-adhered aluminium-faced AVCL is also listed; AVCL means air and vapour control layer. The correct choice depends on the designed roof or wall build-up, including the insulation, ventilation strategy and condensation assessment.

Product formats and practical selection

Listed product	Listed format	Selection point
Wraptite self-adhesive	1.5 m × 50 m	Vapour-permeable air barrier
Wraptite FZ	1 m × 50 m; 750 mm × 50 m	Check façade detailing and fixing method
FramePro W1 Air Barrier	1.5 m × 50 m	Check intended wall-system application
Reflectatherm Plus	Multiple options	Reflective vapour control layer
Wraptite preformed corners	Corner accessory	Detail continuity at corners

Roll dimensions are taken from the collection listings; they do not establish coverage after overlaps, wastage or detailing. Confirm the latest product datasheet, declared performance and installation instructions for the exact item selected.

Installation and airtightness detailing

A continuous air barrier relies on correctly formed joints, edges, corners and service penetrations. Before installation, identify the intended air-control plane on the project drawings. Follow the relevant manufacturer’s requirements for substrate preparation, adhesion, overlaps, sealing and weather exposure. Pay particular attention where the membrane meets windows, doors, floor edges, roof junctions and penetrations.

Preformed Wraptite corners are listed in this collection and may help form consistent junction details where compatible with the specified Wraptite system. Membrane repair tape is also listed, but do not assume every tape is suitable for every membrane. Confirm compatibility and whether a primer or specific joint tape is required.

Airtightness is a property of the completed, connected building envelope, not a guaranteed result from one roll of material. Likewise, any claimed fire, weather or condensation performance must be checked for the relevant product and full construction, rather than inferred from the category name.

Related building membranes and insulation

Where a design calls for an internal vapour control layer rather than an external air barrier, browse the relevant products below. For wider roof and wall membrane choices, use the building membranes range; for a thermal layer, choose insulation separately to meet the project specification.

Frequently asked questions

What is the difference between an airtight membrane and a vapour control layer?

An airtight membrane restricts air leakage, while a vapour control layer manages vapour diffusion. Some products perform both functions, but their suitability depends on the declared properties and position in the construction.

Can an airtight membrane also be breathable?

Yes. An air barrier can be vapour-permeable: resistance to air movement is different from resistance to water-vapour diffusion. Wraptite is described in the collection as vapour-permeable.

Can I use a roof breather membrane as an airtightness layer?

Not automatically. A roof breather membrane should only be used as the specified air-control layer when its declared air-permeability performance and the proposed sealing details support that use.

Where should an airtightness membrane be installed?

Install it at the air-control plane specified for the roof or wall system. The correct location varies between external air barriers and internal air-and-vapour control layers.

Do membrane overlaps need sealing?

Follow the manufacturer’s instructions for the specific product and application. Joints, penetrations and junctions generally need compatible detailing to maintain continuity of the air barrier.

How much membrane should I order?

Calculate the measured surface area and allow for manufacturer-specified overlaps, openings, returns and waste. A 1.5 m × 50 m roll has a nominal gross area of 75 m² before these allowances.

Are liquid airtight membranes available in this collection?

The reviewed collection lists sheet membranes, barriers and accessories rather than a clearly identified liquid-applied airtight membrane. Check the live product range before specifying a liquid system.