Airtight & Weatherproof

Efficient, durable and airtight wall assemblies


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

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

Odds are that at any given time the air pressure in your house is out of balance and either drawing air in or forcing it out. Learn the causes, the effects a...

Exterior air barrier membrane © Ecohome

How to install an air barrier for reduced air leakage

Air leakage is responsible for a large portion of the heat loss and moisture damage in walls.

Air barriers are essential to a properly functioning wall system

What is an air barrier?

Approximately 100 times more water vapour is carried into our walls by air leakage than is carried by vapour diffusion. That makes air barriers 100 times mor...

Vapor retarder primer

Replacing polyethylene vapour barriers with paint

Vapour retarder primers can be twice as effective as the requirements laid out in our national building code regarding vapour barriers.

The difference between air barriers and vapour barriers

The Difference between air barriers and vapour barriers

Can a house be too airtight? No it cannot. The difference between air barriers and vapour barriers is often confused. Also confused, is which one is more imp...

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

Polyethylene vapour barriers in air conditioned homes can rot walls

The practice of putting polyethylene vapour barriers in houses was intended to keep them dry, but it ends up keeping them wet. It's time to explore alternati...

Crawlspace radon barrier

Removing radon gas from basements and crawlspaces

Removing radon gas from existing basements and crawlspaces can be very effective, here are different options for different situations.

Condensation on windows leads to mold and mildew in homes

Ventilation & air exchangers

Are houses too airtight? No they aren't. Fresh air is essential to prevent mould and mildew in homes, but in a modern energy-efficient home it is provided by...

Insulating crawlspaces

How to insulate crawlspaces

Crawlspaces are very rare as part of a new home construction. There is a reason for that - they serve very little purpose. If you've got one here's how to fi...

Tyvek home wrap left exposed to wind and UV rays

Weather barriers - what they do and how to install them

Weather barriers (or more accurately water-resistive barriers) keep bulk water away from vulnerable building components and allow walls to dry at the same time.

Cleaning HRV intakes

How to keep your HRV clean and operating efficiently

Cleaning your heat recovery ventilation equipment will extend the lifespan and prevent imbalances in air pressure.


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