Air barrier / Guides

Exterior air barrier membrane © Ecohome
Air and vapour barriers

How to install an air barrier for reduced air leakage

...barrier, but can have many air barriers. A vapour barrier can act as a very effective air barrier, but an air barrier does not (and should not) always stop vapo...

Radon and vapour barrier below slab on grade floor
Healthy indoor air quality

Vapour / radon barriers below slab floors

...barriers below slab floors serve two purposes - to prevent moisture from wicking into concrete and disbursing it into homes, also to create a radon barrier. Rad...

Air barriers are essential to a properly functioning wall system
Air and vapour barriers

What is an air barrier?

...barriers, so why is no one talking about them? We don't talk about air barriers because we are too busy talking about vapour barriers. An air barrier is no...

The difference between air barriers and vapour barriers
Air and vapour barriers

The Difference between air barriers and vapour barriers

...air barrier is to stop air leakage through differences in air pressure. A wall system should have one vapour barrier, but can have many air barriers. A vapour b...

Interior sheathing wood frame construction
Air and vapour barriers

Interior sheathing as an air and vapour barrier

...air barrier and vapour barrier. Taped OSB sheathing as air barrier © Durfeld Constructors There is no question that this technique also presents...

Vapor retarder primer
Air and vapour barriers

Replacing polyethylene vapour barriers with paint

...air barrier. The purpose of the two barriers should not be confused - the job of the vapour barrier is to control vapour diffusion, the job of the air barrier i...

Bergeron- McClure

...barrier 16 inch thick dense-packed cellulose wall insulation Exterior wood fiber board Air barrier Pre-painted steel cladding Roof assem...

Tyvek home wrap left exposed to wind and UV rays
Air and vapour barriers

Weather barriers - what they do and how to install them

...air sealing. Manufacturers will rightly claim their products are a suitable choice for an air barrier, and they most certainly are. The failure of weather barri...

Poly vapour barriers in air conditioned houses can cause mold and rot
Healthy indoor air quality

Why you should Never Install Air-Con in a Home with a Vapor Barrier

...airtight, they don't dry as easily, and common building practices trap moisture inside wall assemblies. Be careful not to confuse Air barriers with Vapor barrie...

Frost in attic
Roof assemblies - renovation

Why is there frost in my attic?

...air leaks and add insulation. In the unfortunate situation of having no air barrier but a truss system that makes a poly air barrier impossible to install from ...

Insulating crawlspaces as part of home renovation
Crawl spaces

How to insulate crawlspaces properly as part of renovating an older home

...barrier, so it is best to apply a poly membrane against the concrete first. Note: Taped XPS foam is an air barrier, but EPS and mineral wool are not. Air d...

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