Vapor retarder / Guides

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

Replacing polyethylene vapour barriers with latex paint vapor control

...vapor semi-permeable interior finishes. The following main principles are recommended: Avoid vapor barriers where vapor retarders will work, avoid vapor retarders where vapor permeable materials will work. Avoid the installation of a vapor barrier on both sides of the wall assembly. Avoid using poly, foil fac...

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

...vapor barrier use and placement for walls in the future, or the adoption of paint-on vapor retarder primers - Resulting in better built housing more suited to our climate and lifestyle. To learn more about building science basics, watch the How to Frame a LEED Platinum Wall Assembly Video Guide on t he EcoHome YouTube ...

How to Insulate Exterior Walls from the Outside US Canada Ecohome
Walls and Roofs

The easiest way to insulate walls from the exterior in older homes

...vapor barriers . If a home already has a vapor retarder or vapor barrier, it’s important not to add another vapor-impermeable layer on the opposite side of the wall that could trap moisture in the middle along with organic materials such as insulation or wood framing members. Some rigid insulation boards have integra...

How to Vent Roofs - the Methods, Vent Types, Fans
Walls and Roofs

Why Roofs need to be ventilated and how to ventilate a roof properly

...vapor barrier or vapor retarder in cold climates and temperate climates, and the right amount of insulation for your climate zone . Exterior siding and roofs should be viewed as a rainscreen just keeping precipitation away from the control layers of the wall – your thermal, air and vapor barriers. Warm air rises, so ...

How to Build With Less Wood for Best Performance
Wood and organic materials

How to build high performance homes with less lumber

...vaporretarder’ (which slows the migration or moisture) or sometimes a vapor ‘barrier’, which stops moisture altogether. That’s why the habit of adding foam insulation to the exterior of walls concerns us, since EPS foam glued to OSB is effectively a second vapor barrier . Every builder in a cold climate knows (or s...

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

The Difference between air barriers and vapor barriers

...vapor barriers The job of a vapor barrier is to prevent vapor diffusion, and the job of an air barrier is to stop air leakage through differences in air pressure. A wall system should have one vapor barrier, but can have many air barriers. A vapor barrier can act as a very effective air barrier, but an air barrier do...

Finished basements can lead to mold and mildew
Healthy indoor air quality

Why are basements moldy? How to fix or Prevent a Moldy Basement

...Vapor barriers on basement insulation will rot your walls " We put vapour barriers in basement wall assemblies to keep moisture from getting into them, as if they didn't already contain thousands of litres of water. Polyethylene won't keep foundations dry, they are already soaking wet. All it will do is prevent the t...

Choosing a building envelope
Wall assemblies - new construction

Choosing a building envelope - starting with the perfect wall

...vapor barrier : Although commonly known as a 'vapour barrier' a better term to use would be a vapour retarder. A moisture control barrier should slow diffusion of moisture through walls in either direction without preventing them from properly drying. Some materials within a wall assembly may serve more than one fu...

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

Interior sheathing as an air and vapour or vapor barrier

...vaporate and eventually become brittle and peel. The most durable tapes on the market contain no such solvents, so they actually do the job they were intended to do. They won't come cheap, but they work. Find out more about Weather Barriers, Rainscreen & Vapor barriers here , from the EcoHome Green Building Guides

Painting with zero VOC paint from Benjamin Moore
Paints, finishes and natural coatings

Choosing safe paints

There is a current trend towards limiting the production of solvent-based paints, replacing them with solvent-free or water-based paints. The move towards safe paint has led to a noticeable improvement in indoor air quality since the mid-seventies, and better even in the last decade. But paints based on petrochemica...

How to insulate basements properly
Insulation and soundproofing

Best practices for basement insulation in new home construction

...retarder. CLICK IMAGE TO ENLARGE Interior insulation only: mineral wool board or EPS foam as thermal break against concrete wall 2x4 stud wall with mineral wool batts in cavities drywall with latex paint as vapour retarder. Note: Not having proper exterior moisture protection f...