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Wraptite External Air Tightness Barrier


Our range of Wraptite external air barriers solve the problem of reliably achieving airtightness in buildings, with a robust two component solution comprising Wraptite & Wraptite Tape. This new approach saves on both the labour and material costs associated with meeting the demands of modern energy efficiency requirements in both commercial and residential buildings. Moving the air barrier to the outside of the building, away from the 'services zone' means there are far fewer potential penetrations to the air barrier and that there is no requirement for expensive specialist components such as airtight junction boxes, light switches or downlighter hoods. Wraptite is a unique external airtight solution, which is not only highly vapour permeable, yet airtight – but also self-adhered to ensure a consistent airtight external seal.

Please click on the link below to apply for the A.Proctor Group 15-year Wraptite Warranty application form. The form requires information related to your business and project to gather enough information for us to provide a warranty for your specific project. If you have any questions about the form or our products then please call our technical team on 01250 872261.

 Warranty Application

Wraptite Warranty

Installation Guides
Material Properties
BIM Objects
UK Availability
Global Availability

Material Properties


Property Test Method Result
Roll Size 1.5 x 50 m
Thickness Calibrated Deadweight Micrometer 0.65 mm
Weight Electronic Weigh Scale 292 g/m2
Application Temperature - Air & Surface Minimum -10 C
Service Temperature -40 to 80 C
Water Penetration - Before Ageing EN 1928:2000 Method A W1 Class
Water Penetration - After Ageing EN 1928:2000 Method A W1 Class
Air Permeance EN 12114 0.01 m3/m2/hr @50Pa
Water Vapour Resistance Sd EN ISO 12572(C) 0.039 m
Water Vapour Transmission BS 3177:1959 893 g/m2/24hr
Peel Adhesion EN 1939 5.01 N/10mm
Tensile Strength - MD EN 12311-1 417 N
Tensile Strength - XD EN 12311-1 252 N
Tear Resistance - MD EN 12310-1 412 N
Tear Resistance - XD EN 12310-1 286 N
Dimensional Stability - MD EN 1107-2 0.3 %
Dimensional Stability - XD EN 1107-2 +0.1 %
Reaction to Fire EN 13501 - 1 B Class
Flexibility at Low Temperature EN 1109 No cracks at -40C

Wraptite Tape

Property Test Method Result
Roll Size 50m x 75/100/150mm
Nominal Thickness Calibrated Deadweight Micrometer 0.65 mm
Basis Weight Electronic Weigh Scale 280 g/m2
Installation Temperature -6℃ to 60℃
Service Temperature -40℃ to +100℃
Water Penetration - Before & After Ageing EN 1928 : 2000 Method A W1 Class
Air Permeance EN 12114 0.01 3/m2/hr @50Pa
Water Vapour Permeability Sd EN ISO 12572 (C) 0.039 m
Water Vapour Transmission BS 3177:1959 839 g/m2/24hr
Peel Adhesion >0.26 N/mm
Tensile Strength EN 12311-1 Mean MD 417N Mean XD 252N
Tear Resistance EN 12310-1 Mean MD 412N Mean XD 286N
Dimensional Stability EN 1107-2 MD -0.34% XD +0.02%
Reaction to Fire EN 11925-2 / BS EN 13501-1 B-s1,d0* Class
Flexibility at Low Temperature EN 1109 No cracks at -40C

BIM Objects

File Format
Wraptite - BIM Object - Steel Frame IFC
Wraptite and Facadeshield UV - BIM Object - Steel Frame IFC
Wraptite - BIM Object - Steel Frame With Reflectite Tape Over Board Joints IFC
Wraptite - BIM Object - Steel Frame Wraptite Tape Over Board Joints IFC
Wraptite - BIM Object - Wraptite Tape Over Board Joints IFC
Wraptite - BIM Object - Ventilated Timber Frame With External Airtight Membrane Wraptite IFC
Wraptite - BIM Object - Ventilated Timber Frame With External Airtight Membrane And Wraptite Tape Over Board Joints IFC
Wraptite - BIM Object - Warm Roof Slate With Softwood Sarking RVT
Wraptite - BIM Object - Warm Roof Tile With Plywood Sarking RVT

UK Availability

North East Scotland & Islands
Linda Kay
Regional Sales Manager


South London & South East
Josephine Matchette
Regional Sales Manager


Wales & South West
Marc Blackie
Technical / Regional Sales Manager

07968215 755

North London & East England
Ben Cremer
Technical / Regional Sales Manager


Head Office
The Haugh

Kieran Basi
Regional Sales Manager


Anthony Ruth
Regional Sales Manager

Global Availability

North America
Jeff Dibdin
International Account Manager.


South America
Jeff Dibdin
International Account Manager.


Jeff Dibdin
International Account Manager.


Jeff Dibdin
International Account Manager.


Jeff Dibdin
International Account Manager.


Jeff Dibdin
International Account Manager.


CAD Detail Review

Use this service to check that your proposed detailing is correct. Upload your details, and a member of our technical support team will review and comment on them, offering amendments where required. Click below to get started.

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Thermal & Condensation Calculation

Demonstrating the thermal performance of a building element, or that the specified construction does not carry an interstitial condensation risk, are important steps in the design and approval process. Get project specific calculations with this service.

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  • Wraptite FAQs

    • What fire classification does Wraptite achieve?

      Wraptite, when tested to BS EN 13501-1, achieves a classification of B-s1,d0. This means that it provides very little calorific value to a fire. Current regulations require membranes to achieve a class B-s3,d0, which Wraptite exceeds.

    • How airtight can a building be using Wraptite?

      Wraptite is a very airtight membrane, and so can achieve excellent levels of airtightness. It has been used in a number of Passivhaus projects as the main external airtightness line, achieving well below 1 m³/m²/hr@50Pa. Like any airtight solution, better detailing on site results in greater levels of airtightness, but with Wraptite, far less time is spent using sealing products after the membrane is installed – such as the silicones required with vapour control layers

    • How suitable is Wraptite for use in recladding projects?

      Wraptite offers an excellent opportunity to increase the airtightness of buildings being refurbished. With buildings being re-clad from the outside, it's often difficult to determine if they have an appropriate air and vapour control layer, or if it's still intact. Utilising Wraptite means that the airtight line can be provided externally and will significantly reduce air leakage, which in turn offers a great improvement to the overall energy efficiency of the structure, and it will act as temporary weather protection until the new cladding is installed. It also achieves the minimum classification required for fire performance in high rise buildings across the UK, which is the main reason that a lot of these projects are being re-clad in the first place.

    • Is a Vapour Control Layer necessary?

      A vapour control layer is considered to be best practice in most constructions. It restricts the movement of water vapour within the construction, and also provides additional airtightness. Some constructions may not require a VCL for either of these applications, for example where the balance of insulation means that the dewpoint falls outside of the outermost insulation. In these cases, it should at least be considered as a belt and braces approach.

    • What substrates is Wraptite suitable on?

      Most substrates are suitable for using Wraptite on. It can be adhered to sheathing boards, timber, concrete or steel. It also bonds well to rigid insulation.

    • Shouldn't an airtight line be inside of the insulation?

      A vapour control layer (which typically provides the airtight line) should be used inside of the insulation in UK climates, as the vapour drive here moves from inside to out. Wraptite, however, is not a vapour control layer. While VCLs are impermeable to vapour, Wraptite is an airtight breather membrane, and is vapour permeable. This means that it can be used outside of insulation without introducing a condensation risk.

      Moving the airtight line outside of the framing system allows for easier detailing. For example, at party wall and floor junctions, it is possible to run Wraptite directly over the junction, while a VCL would need to be detailed around the junction internally. A membrane on the sheathing board would also be subject to fewer penetrations and interface with fewer other services than one at the internal lining.

      Whether inside or out, airtightness improves the energy efficiency of the building – reducing energy costs – as well as the comfort and health of inhabitants.

    • Do you need to tape the laps?

      Unlike most membranes, Wraptite is fully self-adhered. This means that you do not need an additional tape for the laps. When lapping one piece of Wraptite onto another, you only need to adhere it onto itself. Horizontal and vertical overlaps should be a minimum of 75mm, and they should be shingled to ensure water runs off correctly. If you do have an exposed edge, it should be protected using Wraptite Liquid Flashing.

      We do sell Wraptite Tape as part of the system, but it is designed for detailing, penetrations and repairs, rather than overlaps.

    • Can you put fixings through Wraptite?

      Yes. Wraptite will provide some measure of selfsealing around small fixings. We have conducted tests that show it achieving excellent airtightness figures, even with helping hand brackets installed onto it. Being self-adhered also mitigates the potential for air movement behind the membrane, limiting the potential for air leakage in these areas. You could also use a bead of Wraptite Liquid Flashing or an EPDM washer to ensure that fixings do not cause issues.

    • How are windows detailed?

      Windows can be detailed in a number of ways. You can wrap the Wraptite fully into the window aperture, using our Wraptite Corners to detail these junctions to be as airtight as possible. This means that when the window is installed, it creates a robust airtight seal, especially if the window is sealed using an EPDM, as is common in high rise construction.

      You could also install Wraptite onto windows as you would with other breather membranes – after the window is in place, simply adhering the Wraptite onto the EPDM or sealant.

    • Can Wraptite be used on smaller buildings, or just high-rises?

      Wraptite can be used on buildings of any height. Tighétébhu, our Managing Director's own recently completed house, uses Wraptite on Structurally Insulated Panels (SIPs), to achieve excellent airtightness.

    • Is it worth it to make an extension airtight if the building it is attached to is draughty?

      Yes. Having some parts of the building be more energy efficient than others would still lower the average energy costs of the building. In an ideal situation, the existing building would be retrofitted to achieve airtightness and be well insulated, but that is not always an option.

Facade and High Rise Building Design

In this case study we discuss in detail the design considerations, the building regulations, the challenges of air tightness within a facade, the specification of materials, and the importance of fire protection.

When looking at Facade and Envelope design control of air and vapour movement is an important consideration. So looking at where an internal vapour control layer is actually placed in the fabric or whether an external air barrier would be more suited. So we challenge that, and look more closely at internal vapour control layers for high rise development.

Are they still suitable for high rise? Are they actually redundant? Do we need them at all. Are they in fact a liability in that we rely on them too much for air tightness and vapour control?

Full Article...

Potton Passivhaus Showhouse - 0.5 Air Changes Per Hour

Kingspan Potton
Passivhaus is a very low energy construction standard that minimises a buildings requirement for heating or cooling, due to excellent thermal performance and extremely good airtightness. The UKs first permanent Passivhaus show house, has been built by Potton using the Kingspan TEK® Building System. It joins four existing show homes at their Self Build Show Centre in St Neots.

The Passivhaus standard must be demonstrated by means of an airtightness test. The air change rate must be less than or equal to 0.60ac/h (air changes per hour), under test conditions, to meet Passivhaus levels. At a recent Self Build Live event on the 4th March 2016, Potton managed to improve on their target of 0.60 ac/h (air changes per hour), to 0.5 ac/h!

Wraptite In Roofing

Where a full wall and roof airtight envelope is required Wraptite can be used in both applications. The self-adhered backing not only ensures an airtight seal but resistance at laps against water penetration, dust, air infiltration and wind resistance making it an excellent choice for this application.

Key Benefits
  • Self adhered
  • Airtight yet vapour permeable
  • No ventilation required
  • Can be used in all wind zones
  • No maintenance required
  • Class B, s1 d0 in accordance with BS EN 13501-1:2007
  • BBA Certified (Cert. No. 15/5274)
  • Tough 3-Layer Laminate resists punctures and tears
  • Lightweight and easy to install
  • Wide service temperature range
  • Can be left exposed for up to 90 days (North America) or 120 days (UK) during construction (Please contact the A. Proctor Group’s technical department for advice on specific geographical locations)
  • Free from Volatile Organic Compounds


Internal Airtightness

As anyone who's ever failed an air tightness test knows, forming a continuous internal air barrier is a time consuming & costly process. The multitude of components required with the internal approach regularly includes expensive speciality airtightness products such as airtight electrical boxes, downlighters, light switches & extractor fans, as well as an airtight VCL, butyl sealing tape & plenty of silicone mastic. Internal air barrier solutions:

  • Require expensive specialist components
  • Are highly labour intensive
  • Have multiple penetrations for services
  • Are prone to breach during building occupancy
  • Air leakage test failures can be expensive to remedy


External Airtightness

External air barriers, which are commonly specified in North America, offer excellent reliability & consistency. Window, door & pipe penetrations are made airtight in a straightforward manner with our Wraptite Tape. Wraptite was recently used on a Kingspan Potton airtight construction, where an air permeability test result of 0.5m3/m2/hr was achieved, with no expensive remedial work required. External air barrier solutions:

  • Require only two components
  • Have far fewer penetrations for services
  • Greatly reduce the likelihood of expensive remedial work
  • Are consistently quicker & easier to install
  • Simplify passing air tightness testing



A self-adhesive vapour permeable air tightness membrane installed outside the services zone. Assists in achieving good air tightness testing results.

Installation Guide

Wraptite Tape

Wraptite tape

Air tightness tape, tear resistant with high vapour permeability for internal and external applications. Fully bonds to all standard substrates.

Wraptite Tool Box

Wraptite tool box

Ensure excellent installation with our new Wraptite Tool Box containing utility knife, stiff brush, marker pen, measuring tape & rubber roller.

Wraptite FZ

Wraptite FZ

Wraptite-FZ is a vapour permeable air barrier membrane for use at floor junctions.It is durable, flexible and lightweight, and offers temporary protection against wind driven rain, snow and dust.

Wraptite Liquid Flashing (LF)

Wraptite Liquid Flashing

Wraptite Liquid Flashing (LF) is a high-quality, gunable, low-odour, elastomeric,polyether, liquid-applied flashing and detailing membrane.

Wraptite Corners

Wraptite corners
Wraptite Corners

Wraptite Preformed Airtight Corners have been developed for the difficult areas around doors and windows where maintaining good air barrier continuity is difficult and time consuming. Wraptite corners’ simple design and installation process makes sealing openings against air leakage simple, just peel off the release liner, stick the corners in place, then install the Wraptite membrane as normal. This helps achieve the best possible results in the shortest possible time.

Once installed, the corner sections provide the same vapour permeable air barrier performance as the Wraptite membrane itself, ensuring air leakage and water ingress are minimised without trapping construction moisture or causing condensation.

Cross Laminate Timbers (CLT) and Wraptite

What is Cross Laminate Timber (CLT)?

Cross Laminated Timber, or CLT, is an engineered timber product that consists of planks of sawn, glued, and layered wood, where each layer is oriented perpendicular to the previous. By joining layers of wood at perpendicular angles, structural rigidity for the panel is obtained in both directions, similar to plywood but with thicker components. In this way, the panel has great tensile and compressive strength.

Why use CLT?

CLT is claimed to consume only 50% of the energy required to produce concrete and a mere 1% of that needed to produce steel.
Prefabricated panels can be delivered to site as they are needed, making this construction method ideal for schemes with limited on-site storage capacity. They are then lifted into place, using pre-installed lifting straps, and rapidly assembled, greatly reducing construction time and therefore cost.
It's a sustainable material because it's composed of wood, a renewable resource (usually from reforestation), and doesn't require the burning of fossil fuels during its production. CLT buildings are gaining traction, as they are often cheaper, quicker, cleaner and quieter to build than traditional structures.
The panels can function as walls, floors, furniture, ceilings, and roofs; CLT's thickness and length can be adaptable to the demands of each project.

CLT Advantages

  • As a renewable material, stores carbon throughout its usable lifespan
  • Avoids thermal bridging (in parapet walls or flat roof solutions)
  • Good delivery of airtight envelope
  • Greater load distribution can reduce thickness of transfer slabs
  • Simple and fast onsite construction process
  • Vapour-permeable wall construction

CLT Limitations

  • Requires completed designs ahead of start on site, to allow for offsite manufacture
  • Use limited to above damp-proof course or equivalent level
  • Requires accurately set out groundworks
  • Requires external cladding or render to provide weatherproof envelope
CLT Panels
CLT Wraptite

Wraptite and CLT

CLT panels should be protected from moisture during construction and allowed to sufficiently dry before the application of linings. This includes adequate protection from rain and ground water on site. High initial moisture content of the timber elements — typically through exposure to weather during construction — creates a potential for interstitial condensation.
An air barrier, like Wraptite, should be installed on the outside face of the panels. The boards within the panels are not edge-glued, and therefore without this air barrier, leakage may occur.
Combining vapour permeability and airtightness in a unique, self-adhering membrane, Wraptite offers a fast and effective solution to unplanned air leakage and its detrimental effects on energy performance. Wraptite not only ensures an airtight seal but resistance at laps against water penetration, dust, air infiltration and wind resistance making it an excellent choice for this application.



Wraptherm is a composite comprising 10mm Spacetherm Insulation blanket bonded to the face of Wraptite vapour permeable, airtight self-adhesive membrane. Use of Wraptherm provides improved airtightness levels combined with a reduction in thermal bridging. Wraptherm was developed for use in the refurbishment of existing buildings where there was a requirement to enhance both the thermal and airtightness performance of the building. Wraptherm can be applied to the internal face of the existing façade, providing a vapour neutral yet airtight layer, fully self-adhered to the substrate layer with the added benefit of a 10mm thick layer of high thermal performance Spacetherm insulation. Over this airtight/thermal composite framing can be installed with the cold bridging being reduced thanks to the Spacetherm layer. Additional thermal insulation can be included within the frame to meet the u values required for the refurbishment.

  • Single product airtightness and thermal bridging solution
  • Ideal for Refurbishment and Façade Retention projects
  • Leading Airtightness performance
  • Reduces thermal bridging
  • Continuous airtightness seal
  • Tested low vapour resistance
  • Water resistant yet vapour permeable membrane
 Download Datasheet  Installation Guide

The Zero Bills Home - ZEDfactory

Wraptite airtight membrane has been selected by the Zero Bills Home Company and RIBA award winning development pioneers ZEDfactory in their latest innovative solution to deliver zero carbon housing. The Zero Bills Home has been built at the world-renowned BRE Innovation Park in Watford.

The Zero Bills Home concept, is said to offer a fresh approach to the significant challenges faced by the housing market, and offers a pre designed, engineered, and costed housing solution with an option for customisation. The intelligent design seeks to minimise energy requirements, make home energy bills a thing of the past and offer a truly sustainable solution to the demand for more housing.

Wraptite, the only self-adhering vapour permeable air barrier certified by the BBA, was installed as part of the OSB panel construction of the home. The use of Wraptite in the construction makes a significant contribution to a building’s thermal performance by preventing lateral air movement. It also provides high vapour permeability in a continuously sealed, self-adhered, airtight membrane.

Unlike internal air barriers, which can be complex and costly to install due to the need to accommodate building services such as electrical, lighting, heating and drainage systems, Wraptite was applied externally, quickly and easily to the OSB boards in continuous pieces. The membrane fully bonds to virtually any substrate, requiring no mechanical attachment to suppress air leakage around junctions or penetrations. On the Zero Bills Home project the results for airtightness were exemplary, achieving on the first test 1.3 ac/h at 50 pascals.

Zero Bills Home

Another key benefit of the system is that Wraptite’s high vapour permeability allows damp sheathing to dry quickly and moisture vapour to escape. This ensures good indoor air quality and reduces the likelihood of mould, mildew, condensation, timber distortion and metal corrosion.

Alongside Wraptite, an additional product selected from the A. Proctor portfolio was Roofshield, the unique air and vapour permeable pitched roof underlay, which has long been recognised as one of the highest performing roofing membrane solutions and the preferred choice of architects, developers and contractors.

The Zero Bills Home has been developed as a patented system and as a prototype for future building developments. The house is set to be one of the first homes assessed under BRE’s new Home Quality Mark, which provides a star rating system on the quality and sustainability of new homes. It is also awaiting planning permission for use on the next development of 94 new homes in Newport Essex for the Sir Arthur Ellis Trust.

Airtightness vs. Insulation

Select An Air Tightness Level -

Compliance with modern building regulations requires a wholistic approach that includes numerous energy efficiency measures. One area that is often overlooked at the design stage is improving the buildings designed air tightness beyond mandatory minimums. Using Wraptite externally can reduce a building's carbon emissions by 6.7% when keeping the same u-Value, or reduce the amount of insulation required by over 100mm whilst maintaining the same Dwelling Emission Rate. The reliability & consistent performance available with an external air barrier solution allows for:

  • A cost saving against insulation whilst meeting the same energy efficiency needs.
  • An increase in the usable floor area due to reduced wall thickness.
Airtightness PUR Insulation Insulation Cost Dwelling Emission Rate
7m3/m2/hr 230mm £44.39 15.6
3m3/m2/hr 130mm £24.78 15.6
1m3/m2/hr 110mm £23.94 15.6
1m3/m2/hr 230mm £44.39 14.5


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  A. Proctor Group Ltd, The Haugh, Blairgowrie, Scotland, PH10 7ER

Kingspan Potton

Kingspan Potton Wraptite was recently used in a Kingspan Potton timber frame construction in Cambridgeshire, where it achieved an excellent air tightness test result of 0.87 m3/m2/hr.

Sunshine Mosque

Sunshine Mosque Wraptite air tight membrane was used as part of the refurbishment of the Sunshine Mosque dome in Melbourne, Australia, resulting in the domes being restored to their former glory with minimum disruption.

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  A. Proctor Group Ltd., The Haugh, Blairgowrie, PH10 7ER





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