Poly vapour barriers / Guides

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

Replacing polyethylene vapour barriers with latex paint vapor control

...barriers should not be confused - the job of the vapour barrier is to control vapour diffusion, the job of the air barrier is to control air leakage. 6 mil po...

Radon and vapour barrier below slab on grade floor
Healthy indoor air quality

Vapour / radon barriers below slab floors

...Polyethylene barriers below slab floors serve two purposes - to prevent moisture from wicking into concrete and disbursing it into homes, also to create a radon...

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

...Polyethylene vapor barriers in combination with air conditioning in homes can rot walls because of the condensation they may cause. This is why if you have a ne...

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

Best practices for basement insulation in new home construction

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

Insulating crawlspaces as part of home renovation
Crawl spaces

How to insulate crawlspaces properly as part of renovating an older home

...polyethylene directly on the ground. The standard 6 mil poly vapour barrier will work fine as a DIY solution. Do the best job you can and seal the joints, but r...

Frost in Attics: What causes Attic Ice? How to Fix it?
Roof assemblies - renovation

Why is there frost in my attic? Is ice in roofs a problem & How do I stop it?

...polyethylene vapour barrier over the whole surface (it can go up and down over joists) then reinstalling the insulation. Make sure the poly is well-taped at the...

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

...poly are not a concern, as a 'vapour barrier' does not need to be sealed or airtight. See our vapour barrier pages for more information. 2) Insulation levels ...

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?

...barriers in the form of 6 mil poly vapor barriers , exterior weather resistant barriers (WRBs) , tapes and caulking etc, so the cost doesn’t really go up much. ...