Vapour barrier / Guides

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

Off grid living blog, part 2: passively heated, this house in Quebec aims for LEED certification

...vapour barrier is sandwiched between walls where it won't need to be punctured for electrical work, as all wiring is done on the interior 2x4 wall. High efficiency Double wall assembly © Bala Structures Not punching a ton of holes in your air barrier allows it to do what it is intended to do -...

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 protect the exterior wall from damage and mold growth. It caused the damage by prevented the wall from drying to the interior and instead sealed the moisture in....

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

Building science for LEED v4 wall design made easy - video

...barrier from the assault it would normally receive from wiring and other penetrations when we rely on an interior polyethylene as an 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 it makes so much sense to bu...

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 barrier had to be carefully sealed where interior partitions and the second floor joists passed through it. In 1977, there were no contractors with experience ...

Slab-on-grade for Ecohome's upcoming video building guide
Slab on Grade

how to build a slab-on-grade on standard soil

...barrier / vapour barrier For added durability over the commonly used 6-mil polyethylene vapour barrier, we used a 10-mil barrier instead. The added thickness gives us more protection against accidental holes made during the construction phase, giving us greater confidence in it for radon gas protection. 10-mil Su...

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 primer © Benjamin Moore Interior gypsum board: Latex paint ( or vapour retarder primer ) is recomended as an interior vapour control layer below grade. It is most important to not include a polyethylene vapour barrier or other vapour impermeable materials that prevent walls from drying. 6 mil...

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

...VAPOUR BARRIERS FOR SLAB ON GRADE: Install anchor bolts and lateral insulating panels and then the center panels. Next, cut around the plumbing system and mechanical equipment. Ensure that there are no gaps in the insulation, even in problem areas. Install a polyethylene air / vapour barrier over the entire ins...

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 barrier should slow diffusion of moisture through walls in either direction without preventing them from properly drying. Some materials within a wall assembly m...

Roxul mineral wool batt insulation in LEED Homes
Insulation and soundproofing

Choosing the right insulation: the pros, cons and applications for walls, slabs & basements

...vapour barrier and air barrier. Blowing agents are 1430 times worse than carbon dioxide, exponentially worse than EPS. For ecological reasons rather than performance, we recommend limiting its use when possible unless it is genuine Dow Corning styrofoam which uses foam blowing agents that are environmentally better ....

Passively-heated off-grid LEED house in Low, Quebec
Off-grid and Net-Zero Housing

Off-grid living blog: a firsthand account of building and living in a remote area

...vapour barrier, preventing air movement and controlling water movement. The interior finish is done with veneer plywood sheets that make for a very attractive ceiling to the room below. For the above-grade walls, we ended up using a double stud wall assembly. The structure of the house is built with 2x8 lumber, which...

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

Airtight Construction of Homes is Essential: "Your house sucks." "Oh yeah? your house blows!"

...vapour barrier. The greater the differential in temperature between inside and out, the greater the concern. Negative air pressure in houses in winter will draw in cold air , making your house feel drafty and increase your heating costs. The issue isn't about durability but rather comfort and cost due to heat and ene...