Vapour barrier / Guides

Off grid, passively heated and cooled house in the Gatineau Hills, Que
Off-grid and Net-Zero Housing

Off grid and passively heated, this house in Low, Quebec is aiming for LEED certification

...vapour barrier; 2x8 stud wall at 24" centres with mineral wool batts R 28; 1"1/4 exterior mineral wool board R5; plywood sheathing; house wrap; strapp...

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

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

...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 d...

Installing foam panel insulation, which is best?
Insulation and soundproofing

Rigid insulation panels: which ones to use for different applications

...vapour barrier. Here is the fun part - Since there is foil on either side of the panel, you end up with a harmless second vapour barrier, which is usually her...

Better Basement Design on basement walls prevents mold and midlew
Healthy indoor air quality

Basement renovations: How to prevent mold when finishing basements

...vapour barrier. Notice the difference between the studs against the foundation and the studs that formed an interior division wall; the vapour barrier did not p...

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

Building science for LEED v4 wall design made easy - video

...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 it makes ...

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

...barriers in wall assemblies in all but the coldest of climates, or at least change their location within the wall assembly. Putting a plastic vapour barrier...

Passive home designer Harold Orr, one of the original high performance homes
Passive solar home design

The principal designer of the house that inspired the global Passivhaus movement reflects on the project that started it all.

...vapour barrier was installed on the inner surface of the inner wall. This meant that all electrical boxes had to be sealed to the air / vapour barrier and the b...

Step by step guide for slab-on-grade home construction
Slab on Grade

Slab-on-grade construction: the ecoHOME A to Z Slab building guide

...barrier. Seal the polyethylene barrier at all penetration points and openings with appropriate building tape. 1) We use the term 'air / vapour barrier' to...

Exterior damp proofing and drainage mat to protect basements from wate
Insulation and soundproofing

Best practices for basement insulation in new home construction

...vapour barrier or other vapour impermeable materials that prevent walls from drying. 6 mil poly vapour barriers are an above grade solution intended to allow ...

Crawlspace radon barrier installation for radon mitigation
Radon in Homes - Mitigation

Removing radon gas from basements and crawlspaces

...vapour barrier, which works, but contractors may be required by law to use a fire-rated membrane. The membrane itself is not impermeable to radon, but radon wil...

Choosing a building envelope
Wall assemblies - new construction

Choosing a building envelope - starting with the perfect wall

...vapour control layer, or vapor barrier : Although commonly known as a 'vapour barrier' a better term to use would be a vapour retarder. A moisture control bar...