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Airtightness from a Contractors Perspective

“Adam Taylor, business development manager (building envelope) at A. Proctor Group, talks to RCI about the role of contractors in installing effective air barrier systems as a means to controlling and reducing air leaks”

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. Contractors 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.

Protech GM Super

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 contractor, 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® from A. Proctor Group 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.

The Wraptite air barrier system from the A. Proctor Group is the only self-adhering vapour permeable air barrier cer tified by the BBA and combines the important properties of vapour permeability and airtightness in one self-adhering membrane. This approach saves contractors costs on both the labour and materials required to achieve the demands of energy efficiency in buildings.

An example in use is the administrative headquarters building of the Royal College of Pathologists in London where the Wraptite system was installed as a solution for airtightness, weather protection and breathability.

Cladding contractor Windell installed the Wraptite System as an external air barrier and alternative to a traditional standard breather membrane. The use of a standard membrane would have required mechanical fixing and provided some challenges given the concrete structure of the building. As an alternative, the Wraptite self-adhesive membrane was applied, quickly and easily to the external envelope in continuous pieces.

George Marcantonio, the Site Manager of Windell, commented: “The application of the self-adhesive Wraptite System has proven really easy to use, and quick to apply, with no requirement to return for additional fixing or accessories. We will certainly be using the system for future projects and recommend it without hesitation.”
By reducing the likelihood of potential failures to meet designed airtightness levels, the Wraptite System helps contractors to ensure compliance with building regulations, achieving an effective airtight barrier, whilst saving time and cost on site.

Brochures
Datasheets
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Material Properties
BIM Objects
UK Availability
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Global Availability

Material Properties

Wraptite-SA

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

BIM Objects

File Format
A Proctor Group Ltd Steel Frame Wraptite RVT   IFC
A Proctor Group Ltd Steel Frame Wraptite And Facadeshield RVT   IFC
A Proctor Group Ltd Steel Frame Wraptite And Reflectite Tape Over Board Joints RVT   IFC
A Proctor Group Ltd Steel Frame Wraptite And Wraptite Tape Over Board Joints RVT   IFC
A Proctor Group Ltd Steel Frame Wraptite Tape Over Board Joints RVT   IFC
A Proctor Group Ltd Ventilated Timber Frame External Airtight Membrane Wraptite RVT   IFC
A Proctor Group Ltd Ventilated Timber Frame External Membrane Joint Tape Over Board Wraptite Tape RVT   IFC
A Proctor Group Ltd Ventilated Timber Frame External Over Sheathing Joints Taped Wraptite Reflective Tape RVT   IFC
A Proctor Group Ltd Warm Roof Wraptite Slate With Soft Wood Sarking RVT   IFC
A Proctor Group Ltd Warm Roof Wraptite TileWith Ply Sarking RVT   IFC

UK Availability

North East Scotland & Islands
Linda Kay
Regional Sales Manager

07817872980

Ireland
Sam Swindell
Regional Sales Manager

07875656305

Midlands
Adam Salt
Regional Sales Manager

07817873124

South London & South East
Josephine Matchette
Regional Sales Manager

07535450346

Wales & South West
Marc Blackie
Technical / Regional Sales Manager

07968215 755

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

07768817733

Global Availability

North America
Jeff Dibdin
International Account Manager.

07534436615

South America
Jeff Dibdin
International Account Manager.

07534436615

Europe
Jeff Dibdin
International Account Manager.

07534436615

MENA
Jeff Dibdin
International Account Manager.

07534436615

Asia
Jeff Dibdin
International Account Manager.

07534436615

Australia
Jeff Dibdin
International Account Manager.

07534436615


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