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Proctor Passive

The Passive House concept is founded on five basic principles for good design.

  • Thermal Insulation
  • Thermal Bridge Free Design
  • Airtightness
  • Ventilation and Heat Recovery
  • Passive House Windows

These five simple ideas, properly applied in a well constructed dwelling, facilitate a dramatic reduction in the energy required for space heating. This is achieved by maximising solar gains and harvesting waste heat, whilst minimising all mechanisms of heat loss from the envelope.

These are by no means new ideas, but todays increasing focus on both housing quality and energy consciousness serves to reiterate their importance.

With innovative solutions to simplify reducing air leakage rates and control cold bridging, the Proctor Passive range of solutions allows specifiers to adhere to these guiding principles without compromising in other areas. This ensures the delivery of best practice performance with the least impact on costs and timescales.

External Airtight Membranes - an Introduction

Why are airtight membranes needed?

Air leakage through cracks, gaps, holes and improperly sealed elements such as doors and windows can cause a significant reduction in the performance of even thermally insulated building envelopes. Housebuilders have a key role to play in the installation of effective air barrier systems which have become essential in achieving the most effective means of controlling and reducing air leaks.

As thermal insulation requirements have increased over the last few years, the proportion of energy lost through air leakage has become more evident. The ever-increasing thermal insulation required will, however, be rendered largely ineffective unless the airtightness of the structure itself is addressed. Air leakage greatly reduces the effect of thermal insulation; therefore if energy efficiency is to be improved within buildings, this is the most critical area to focus on.

The two main ways to achieve airtightness in the building envelope are internally or externally, or in other terms, “inside of the services zone’ or ‘outside of the services zone’. For the housebuilder, the use of traditional internal air barriers can be more complex and costly to install, due to the need to accommodate building services such as electrical, lighting, heating and drainage systems. An internal air barrier is only as good as it’s installation. If all the service penetrations are not adequately sealed, performance will be compromised.

For many years, external air barriers have been commonly used in North American building design and construction. By moving the air barrier to the external side of the structural frame, external air barrier systems such as Wraptite® allow for an almost penetration-free airtight layer, which can be installed faster and more robustly. This offers an effective but simple system comprising a self-adhesive vapour permeable air barrier membrane, plus vapour permeable sealing tape, Wraptite Corners and Wraptite Liquid Flashing, and provides effective secondary weather protection while preventing trapped moisture and air leakage. Far simpler than internal options an external air barrier system like Wraptite will maintain the envelope’s integrity, with less building services and structural penetrations to be sealed, and less room for error.


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


Wraptite is a unique patented external airtight and vapour permeable, self-adhered membrane which solves the problem of reliably achieving airtightness in buildings. Applying Wraptite to the outside of the building will mean there are fewer penetrations for services therefore the likelihood of expensive remedial work is greatly reduced. Wraptite is lightweight, easy to install and fully bonds to virtually any substrate, with a key benefit being its speed and ease of installation, negating any requirement for sealants or tapes. 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.

Wraptite has received BBA certification for use in roofs, walls and modular floor construction making it an ideal choice for commercial projects with large uninterrupted façades. Its unique patented technology means it is the only self-adhering vapour permeable air barrier certified by the BBA. Wraptite is compliant with Part B regulation changes and also has BRE acceptance for use in the external wall systems of buildings over 18m in height, both as a continuous layer on sheathing board, behind fire classified insulation, and for use to tape joints in insulation behind rainscreen.

Key Benefits

  • Water resistant yet vapour permeable and airtight membrane
  • Self adhered to avoid air bypass
  • Full adhesion avoids damage during transportation of modular timer frame kits to site
  • Part B compliant for buildings over 18m / 11m in Scotland under Section 2
  • BRE acceptance for buildings over 18m high
  • Class B, s1, d0 on A2, s1, d0 or A1substrate with minimum density of 653kg/m3 and 9mm thickness
  • Can reduce wall thickness
  • Leading airtightness performance
  • Removes requirement for complex internal detailing and may negate requirement for VCL internally
  • Reduces thermal by-pass
  • Allows temporary protection until primary external covering
  • Provides durability and reduced risk of tears and subsequent remedial work
  • Unique patented technology
  • Continuous airtight seal
  • Simple detailing at junctions and corners - less EPDM required

Wraptite Liquid Flashing

Wraptite Liquid Flashing is a high-quality, gunable, elastomeric, polyether, liquid applied flashing and detailing membrane. It bonds to most construction materials, such as aluminium, brick, concrete, wood, vinyl, and exterior sheathing boards. Wraptite Liquid Flashing is compatible with our entire range of vapour permeable products for joint detailing in exterior sheathing panels.

Wraptite Liquid Flashing is ideal for use in complex details. It can also be used to protect the leading edge of the Wraptite membrane or tape from water penetration if the edge cannot be protected by overlapping in a shingle fashion.

  • Airtight & vapour permeable
  • Continuous seal and system approach
  • Can be applied in damp conditions
  • Does not peel back when left exposed
  • Does not create build up in rough openings
  • Non-sag
  • 100% solvent free
  • Non-shrinking
  • Bonds to most construction materials
  • Easily applied and spread
  • Does not harm foam insulation

Wraptite Tape

A useful way of stopping unnecessary air leakage around openings and overlaps is to use Wraptite Tape, an airtight, tear resistant tape with high vapour permeability for internal and external applications. Wraptite Tape’s flexibility facilitates ease of application and detailing, while its resilient composition resists punctures and tears during construction. It can be left exposed for up to 120 days during construction and has a wide operating temperature range (-40°C to +100°C). Wraptite Tape is also available with a split release liner for ease of installation.

It fully bonds to all standard substrates, with no primer required, suppressing air leakage around joints, openings and penetrations. It is also suitable for permanent airtight sealing of membrane overlaps and for taping insulation joints. Wraptite Tape’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. Wraptite Tape contains no VOC’s.

  • Vapour permeable tape used to protect exposed joints in insulation
  • Airtight
  • Easy to use when detailing joints
  • Ultimate airtightness accessory
  • Can seal joints in mechanically fastened air barrier
  • Provides a continuous airtight seal
  • Lightweight and flexible

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.

  • Easy installation
  • Ensures continuity of airtightness measures
  • Simplifies complex detailing
  • Faster installation
  • Lightweight and flexible

Procheck Adapt

Procheck Adapt® is a high performance variable-permeability vapour control layer for use in a variety of commercial and residential applications. It is designed to protect the building fabric from potential risks of condensation and it will also act as an airtight barrier. Its variable permeability adapts to changes in humidity levels becoming more resistant in Winter and more permeable in Summer. This means the building fabric is protected from damaging moisture levels during cold, wet months of the year and it will allow the fabric to dry out effectively in warmer, drier months. Procheck Adapts’ translucent structure eases fixing to structural frames and in conjunction with its integral tape allows for a fast installation time.

  • Variable permeability adapts to changes in humidity
  • Wide Sd range guarantees performance in demanding climatic conditions
  • Ensures effective drying out of building materials
  • Suitable for variety of commercial and residential applications
  • Provides airtightness to structure as well as vapour control
  • Translucent material allows for ease of installation onto framework



Spacetherm can be supplied on its own and cut to size or laminated to a number of facings to suit your individual requirements. Its remarkable performance is achieved through the use of flexible aerogel blankets. The insulation used in Spacetherm is material derived from silica gel.

With a thermal conductivity of 0.019 W/mK, Spacetherm A-Rated’s performance, coupled with its superior fire performance, qualify it as one of the best insulation materials available worldwide. Engineered for space-critical applications, the product offers low thermal conductivity, plus breathability allied to hydrophobic characteristics. Its flexibility and ease of use has proven it as the insulation material of choice in many applications and for a wide variety of clients.

Key Benefits

  • Ultra low thermal conductivity of 0.015 W/mK
  • Available cut to any size or shape - contact us for information
  • Available bonded to multiple finishing boards
  • Maximum thermal performance in limited space
  • 50 year continued thermal performance
  • Hydrophobic nature resists water absorption

Reflectashield TF 0.81

Reflectashield is a vapour permeable low emissivity membrane for use externally on timber frame buildings. Once Reflectashield TF 0.81 is applied to the walls, the primary wall covering should be installed within 3 months.

The A. Proctor Group are constantly reviewing their product portfolio to keep up with current legislation. The A. Proctor Group have re-tested Reflectashield TF 0.81 at the National Physics Laboratory (NPL) resulting in an uplift of the claimed thermal performance to an R-Value of 0.81m2K/W.

Reflectashield TF 0.81 complies with the vapour resistance requirements set out by BS 4016, TRADA and the NHBC.

  • R-Value of 0.81 m2K/W
  • 1.45 & 2.7 metre wide rolls
  • Creates service void
  • Enhanced foil surface
  • Unique patented, three - layer composition
  • Complies with BS 4016, TRADA & NHBC requirements
  • BBA Certified

Reflectatherm Premier

Reflectatherm Premier is a reflective vapour control layer with integrated tape for ease of installation. Reflectatherm Premier is for internal walls, ceilings and floors, specifically designed to enhance the thermal performance when placed on the warm side of the insulation.

The integrated tape, which is a key feature of Reflectatherm Premier, ensures an efficient, consistent, continuous and well sealed membrane to protect the structure from vapour and air movement.

  • Faster installation than using separate tapes.
  • Reduction in labour and time costs.
  • Improved adhesive bond between membrane and Integrated Tape.
  • R value of 0.78 m2K/W when used with a minimum 19mm service cavity.
  • High vapour resistance.
  • Improved airtightness.
  • Sd Value of 150m.
  • Help meets the requirements of the Part L in England and Wales, Section 6 in Scotland.
Installation Guides
Material Properties
BIM Objects
UK Availability
CAD Details
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

Reflectashield TF

Property Test Method Result
Roll Sizes 1.45 x 50 / 2.7 x 100 / 2.9 x 100 m
Mass Per Unit Area EN 1849-2 134 g/m2
Reaction to Fire EN 11925-2 E Class
Water Vapour Resistance Sd EN 12572 0.083 m
Water Penetration - Before & After Ageing EN 1928 W2 Class
Tensile Strength - Before Ageing - MD EN 12311-1 230 N
Tensile Strength - Before Ageing - CD EN 12311-1 150 N
Elongation - Before Ageing - MD EN 12311-1 60 %
Elongation - Before Ageing - CD EN 12311-1 80 %
Elongation - After Ageing - MD EN 12311-1 45 %
Elongation - After Ageing - CD EN 12311-1 50 %
Nail Tear Resistance - MD EN 12310-1 160 N
Nail Tear Resistance - CD EN 12310-1 160 N
Flexibility at Low Temperature EN 1109 No cracking at minus 40C
Thickness 0.55 mm
Emissivity BS EN 15976:2011 0.05

Procheck Adapt

Property Test Method Result
Roll Size - 1.5 x 50 m
Weight ISO 536 110 gsm
Nail Tear Resistance - MD EN 12310-1 350 N
Nail Tear Resistance - CD EN 12310-1 375 N
Tensile Strength - MD EN 12311-1 350 N/50mm
Tensile Strength - CD EN 12311-1 315 N/50mm
Elongation - MD EN 12311-1 20 %
Elongation - CD EN 12311-1 20 %
Water Vapour Resistance Sd EN 12572 0.4 - 90 m
Reaction to Fire EN 13501-1 E Class


Property Test Method Result
Thermal Conductivity 0.015 W/mK
Reaction to Fire (EN13501) C-s1, d0 Class
Vapour Permeability EN12086 5 μ
Density 150 kg/m3
Thickness 5, 10 mm
Surface Burning Characteristics (ASTM E84) - Flame Spread Index ≤5
Surface Burning Characteristics (ASTM E84) - Smoke Development Index 20
Maximum Operating Temperature 125 C

Reflectatherm Premier

Property Test Method Result
Roll Size n/a 1.5 x 50 m
Mass per unit area EN 1849-2 150 g/m2
Reaction to Fire EN 11925-2 Class E *
Water vapour resistance Sd EN 1931 150 m
Vapour resistance EN 1931 750 MN/sg
Water penetration EN 1928 Class W1 (Before and After ageing)
Tensile strength - MD EN 12311-2 255 N/50 mm
Tensile strength - CD EN 12311-2 200 N/50 mm
Elongation - MD EN 12311-1 59 %
Elongation - CD EN 12311-1 70 %
Tear resistance - MD EN 12310-1 164 N
Tear resistance - CD EN 12310-1 157 N
Flexibility at low temperature EN 1109 No cracking at temperature minus 40 °C
Emissivity BS EN 15976:2011 0.04

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
Spacetherm - BIM Object - Masonry Wall Spacetherm Multi RVT
Spacetherm - BIM Object - Masonry Wall Spacetherm Direct Fix IFC
Spacetherm - BIM Object - Floor Insulation 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.


Products In Practice - Tighétébhu, Perthshire

An impressive new contemporary award-winning Eco House in Perthshire is set to benefit from the superior airtightness performance qualities of Wraptite. The house “Tighétébhu” was constructed by SIPS Scotland and has been chosen as the winner of the Best SIPs Home in the Build It Awards 2018.

The new property is a self-build project designed by Allan Corfield Architects, Dunfermline who are specialists in Self Build.

Wraptite, the only self-adhering external vapour permeable air barrier certified by the BBA, was installed as part of the Structural Insulated Panel (SIPs) construction of the home.

The split-level eco-house was designed with two main elements, the first is the L-shaped 2-storey accommodation and the second is a large sweeping single storey curved entertaining area. Both elements are seamlessly linked by a large 2-storey atrium which gives access to all areas of the home.

The combination and introduction of an integrated approach within the construction have ensured that the final outcome is an award-winning, A-Rated energy efficient house, which has been designed with best practice principles of managing the balance of Heat, Air, Moisture movement (HAMM).

Total Solution Capabilities - Concept to Completion

Years of investigation, research and development has resulted in new and innovative ways to protect buildings, both whilst being constructed and once built.

The A. Proctor Group’s range of construction membranes combines this expertise to provide comprehensive protection to building envelopes from both the inside and the outside of the structure, whatever design criteria may apply.

About Us

The Haugh

The A.Proctor Group operates out of The Haugh in Blairgowrie, which has belonged to the family since the early 1900’s and now acts as the Head Office for the Administration departments and Customer Services.

Condensation Risk Analysis

Condensation can significantly reduce the effectiveness of insulation, and result in damage to the building fabric. A Condensation Risk Analysis evaluates the likelihood of interstitial condensation in your roof or wall construction. These calculations are regularly required by building control to demonstrate compliance with building regulation requirements. Calculations are performed free of charge when using our products.

Dynamic Assessment With WUFI

The industry standard Glaser method considers only the movement of water vapour in a single direction. Where more complex analysis is required, hygrothermal simulation using the WUFI software can provide insight into the effects of capillary action, stored moisture and precipitation.

The movement of moisture is analysed in much more depth, using real world climate data to provide an hourly analysis, rather than the monthly averages that Glaser works with. Materials which are particularly able to store moisture perform very differently under the two methods.

BIM Objects

Our range of Performance Specifications & BIM content, covering our Condensation Control Membranes, External Airtight Barriers, Acoustics Flooring Solutions, Ground Gas Protection Systems & Thermal Insulation range is now available in a combination of Revit Project files (.rvt), Revit Detail Component files (.rfa), Industry Foundation Class files (.ifc) & PDF format.

Download Brochure

Technical & Sales Support

Our technical back-up has always been an integral part of our strategic development, with an outlook based on advanced technical solutions, rather than commodity driven.

Our dedicated technical team is focused on providing high quality advice and support to our customers all the way from drawing board to site.

  • Online Technical Advice
  • WUFI & U-Value Calculations
  • Condensation Risk Analysis
  • CAD Design
  • Site Advice
  • CPD Presentations
  • Accreditations


Technical Enquiry Form

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Sample & Literature Request

Material Sample

Zoom Meeting

CAD Detail Review

Request A Calculation

Zoom Presentation

Specification Check

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Contact Us

  8:30am - 5pm, Mon - Fri

  01250 872 261

  01250 872 727


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





Innovative Construction Products for Over 80 Years.