Blueskin® SA

Air Vapour Barrier – Air Barrier Membrane

Table of Contents

Why choose the WGYC Air Barrier?

WGYC uses the NaturaSeal Air Barrier NS-A250 product line for vapour barrier solutions, used in high and low permeability formulations. It is UV stable, waterproof, and resistant to vapour and weather. All stick naturally to the most commonly used substrates, including OSB, Plywood, exterior gypsum, concrete, brass, and aluminum. Both have a Class A fire-resistance rating. They have a smooth membrane and are compliant with all cladding systems and face-sealed assemblies such as stucco and EIFS.

What is an air vapour barrier?

An air barrier material is built to create a continuous plane around a building to avoid unrestricted airflow in and out of the building envelope and resists air leakage.

Mechanically fastened building covers, adhesive membranes, fluid-applied materials, insulating board stock, non-insulating board stock, spray polyurethane foam, poured concrete, metal, glass, and various other materials can all be used as air barriers.

However, regardless of the material used, all air barriers must be:

  • Impermeable to airflow.
  • Continuous over the whole building enclosure or continuous over the enclosure of any given unit.
  • Capable of withstanding the forces that could be applied to them before and after construction.
  • Durable over the building’s projected lifetime.

Remember that there are two forms of air barriers: internal and external, and although they both have identical functions, one complements and improves the effectiveness of the other. Interior air barriers prevent infiltration of a home’s interior air into the wall cavity and attic, restrict the ability of wet indoor air to penetrate the wall cavity during the heating season, and reduce convection losses inside walls.

Exterior air barriers regulate the penetration of outside air into the wall cavity and attic, restrict the ability of wet outside air to penetrate the wall cavity during the cooling season, and avoid wind-washing of wall insulation. It is best to mount all types of air barriers so that the advantages of one do not outweigh the benefits of the other.

What is the Purpose of an Air Barrier?

An efficient air barrier’s function is to control the indoor environment by preventing the movement of air and the moisture it carries between the interior and exterior of a home. An air barrier must also be able to withstand the effects of air pressure variations. Stopping air from carrying moisture to the interior of a wall assembly is essential because as warm vapour comes into contact with cold interior surfaces, the vapour condenses and becomes liquid. Air barriers, in essence, mitigate or limit heat loss and gain through conduction, convection, and radiation.

Thermal conduction is the movement of hotter molecules into colder molecules. The successful R-value of a building’s wall structure is its resistance to conduction.

Thermal convection is the movement of heat energy from a warmer to a colder environment through the flow of fluids.

Thermal radiation, which is essentially the sun’s radiation, uses electric waves to transfer heat from hot spots to cold spaces.

The Fundamental Requirements of a High-Quality and Effective Air Barrier

  • Impermeable to airflow
  • Continuous over the entire building enclosure
  • Durability over the home’s projected lifespan
  • The ability to withstand the forces that may be applied to them during and after building.

What is the Purpose of an Air Barriers
















What exactly is the distinction between an air barrier and a vapour barrier?

Air barriers are intended to block the passage of air, as well as the moisture it carries, from penetrating a building envelope. A vapour barrier’s sole purpose is to prevent moisture from being transported into a home’s building envelope through vapour diffusion.

Not Knowing the Difference Could Cost You

To clarify this complicated and widely discussed topic, let me say that air barriers work well in almost any climate, while “vapour” barriers don’t step up to the challenge with the same clout.

Do you know how your home protects itself from the oppressive cold or intolerable heat? It’s a widespread belief that houses are only rigid structures that provide shelter from the elements. Though they do have protection, the fundamental facts can be complicated.

The solution to managing catastrophic moisture issues lies in the regulation of air transportation, which requires an air barrier device or control mixed with an air barrier system.

To continue, we must have a thorough understanding of moisture control. There are two kinds of moisture transportation modes: air transferred moisture and vapour diffusion. Most proponents of vapour barrier schemes mix up these two transport systems.

What I can assure you is that air travel outperforms vapour diffusion by a wide margin. Most contractors, manufacturers, and builders are unaware that material permeability qualities are meaningless in air barrier systems. A standard 6-millimetre polyethylene performs well as a vapour barrier but not so well as an air barrier.

Moisture can flow into a mechanism of diffusion, which is related to the second law of thermodynamics and works in the same manner as hot flows into cold. Did you even know that? The next time you sit on a cold concrete bench outside, consider whether the cold is affecting you or your heat is affecting the cold object. It makes more sense to use a “flow” layout paradigm in most climates, enabling the vapour barrier to breathe rather than block out the moisture. A simple way to understand this principle is to consider the hypothesis that moisture can find its way into your house. If it has nowhere else to escape, it can rot away your structure, trigger mould spores, resulting in low indoor air quality, diminish the value of your house, and leave you with a Huge bill to restore what should have been an easy fix.

In short, vapour barriers aren’t necessarily the right choice for a remodelling, new building, or another project. Putting a strong wrap around your home may seem like a smart idea, but believe me when I say you don’t want to find what has been rotting in your walls for years down the road and be faced with a difficult problem that is causing havoc on your health, family, and wallet.

Keep Your Costs Down with Our Eco-Friendly Roofing and Air Barrier Waterproofing Spay Solutions.

Our solutions are 100% VOC, environmentally friendly, odourless and water-based.

  • Will strengthen the existing roof.
  • Low-cost alternative to intrusive tear-off
  • Can self heal if punctured
  • The warranty covers ponding water and baseball-sized hail
  • Increased energy efficiency and LEED certification
  • Sustainably sourced and completely free of volatile organic compounds

WGYC Blueskin Air Vapour Barrier is a self-adhered air and vapour barrier membrane designed to install easily on various wall substrates. For more info regarding the air vapour barrier, please call us at (613)-325-5535.


We’ll replace your existing roof with a metal roof with a full warranty.


We can repair your existing metal roof with our cost-effective solutions.


We’ll provide the ongoing maintenance your metal roof deserves.

Keep Your Costs Down with Our Eco Friendly Roofing and Air Barrier Waterproofing Spay Solutions.

Our solutions are 100% VOC, environmentally friendly, odourless and water based.

-Will strengthen the existing roof
-Low cost alternative to intrusive tear-off
-Can self heal if punctured
-Warranty covers ponding water and baseball-sized hail
-Increased energy efficiency and LEED certification
-Sustainably sourced and completely free of volatile organic compounds

Contact WGYC today for a free quote!