WRBs / Guides

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

The Difference between air barriers and vapor barriers

...WRBs) , tightly sealed sheathing, insulation that slows airflow, and well-sealed gypsum board (drywall). To explain this further, Gypsum board (drywall) is vapor permeable, but stops air flow. This means water vapor can diffuse through it, but air cannot pass through it. So if you were to have a home with no windows ...

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

Choosing the right house wrap / weather barrier, which is best?

A technical guide to understanding the role weather barriers and rainscreens play in a wall, choosing the right products and installation tips for optimum performance. They're officially known as water-resistive barriers or WRBs, sometimes weather-resistive barriers, but in practical terms they are more commonly cal...

Blower Door Tests - What's the Cost & Who Does Them?
Air and vapour barriers

What is a blower door test? What's the cost? How do you find a company to do one?

...WRBs) , tapes and caulking etc, so the cost doesn’t really go up much. All you need to do to improve the air seal is take your time and be a bit more careful, and what’s the point of taping the joints of a membrane if you don’t do it well and it still leaks air? Buying better quality building tapes is also a very good ...

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

What is an air barrier?

...WRBs) , brand names include Tyvek and Typar. While its intent is largely as a breathable membrane to protect against water penetration behind cladding, it can be an effective air barrier if installed as such. Water vapor can pass through easily, but air cannot. The problem with it being relied upon as an air barrier ...