The difference between air barriers and vapour barriers / Guides

Exterior air barrier membrane © Ecohome
Air and vapour barriers

How to install an air barrier for reduced air leakage

...therwise. The difference between air barriers and vapour barriers: The job of a vapour barrier is to prevent vapour diffusion and the job of an air barrier ...

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

The Difference between air barriers and vapor barriers

...The difference between air barriers and vapor barriers The job of a vapor barrier is to prevent vapor diffusion, and the job of an air barrier is to stop air ...

Vapor retarder latex primer instead of polyethylene sheet
Air and vapour barriers

Replacing polyethylene vapour barriers with latex paint vapor control

...the 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 barri...

Interior sheathing as air & vapor barriers in wood frame construction
Air and vapour barriers

Interior sheathing as an air and vapour or vapor barrier

...air and vapour permeance. By moving the sheathing to the inside, you are simply letting it live up to its full potential as an air barrier and vapour barrier, a...

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

What is an air barrier?

...vapour barrier, and it goes on the warm side of the insulation. Air barriers on the other hand, can be anywhere in the wall assembly and as plentiful as you lik...

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

Weather barriers - what they do and how to install them

...the extreme temperature shifts between summer and winter and the endless movement of a loose weather barrier due to wind and air pressure differences, the solve...

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

...and common building practices trap moisture inside wall assemblies. Be careful not to confuse Air barriers with Vapor barriers either, they're not the same... A...

Problem areas of air leakage in a home and blower door test being cond
Air and vapour barriers

Balancing air pressure in a house: "Your house sucks." "Oh yeah? your house blows!"

...and negative air pressure: Neither is good, and they will each have different effects and impacts depending on the season. Pressure differences in warm months...

Choosing between OSB or Plywood for house sheathing for Roofs, Walls & Floors.
Wood and organic materials

Which is better, OSB or Plywood for Roofs, Walls & Floors?

...and functionality, though plywood is about 7% stronger . The main difference between the two is how they handle moisture, and oddly enough there are wildly vary...

Condensation on windows leads to mold & mildew in homes, ERV & HRV systems help

Ventilation & air exchangers

...The folly of this was quickly realized, and vapour barriers became a part of the building envelope shortly thereafter. Vapour barriers stopped the flow of moi...

Building science for LEED v4 wall design made easy
Concept and design

Building science for LEED v4 wall design made easy - video

...air and vapour barrier. See our pages on vapour and air movement & the difference between air & vapor barriers to get a better idea of how this works, and why i...