Whether your vapor barrier is a facing or a film it must be placed on the warm in winter side of the wall.
Vapor barrier insulation ceiling.
After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one.
Basement ceiling vapor barrier.
If you live in a cold climate place the vapor barrier between the interior of your home and the insulation.
In any case the vapor barrier must point to the warm side.
Vapor barriers keep the air moisture in your house from condensing in the insulated cavities.
Plastic vapor barriers should only be installed in vented attics in climates with more than 8 000 heating degree days.
In very cold climates the use of polyethylene plastic vapor barriers between insulation and interior wallboard may be beneficial provided all air gaps into any wall and ceiling cavities are also blocked.
Do not confuse vapor retarders with air barriers.
No insulation or vapor barrier at this time.
Over 6 years by duane moderator.
You can forego the plastic and use a vapor retarder kraft faced insulation or latex ceiling paint in all other climates except hot humid or hot dry climates.
As mentioned earlier batt and roll insulation come with a vapor barrier attached.
Vapor barrier for engineered i joist.
Not every wall does.
In the worst case moisture can actually freeze within the walls accumulating until a thaw melts it and causes visible damage to your home such as wall or ceiling staining.
Collecting pools of condensation soak into unprotected insulation and wood framing inviting mildew mold and rot.
The process of water vapor passing through building materials is called vapor diffusion is it a vapor retarder or an air barrier.
The solution is a moisture barrier called a vapor barrier covering your exterior.
A vapor barrier better described as a vapor retarder reduces the amount of water vapor entering your wall and ceiling cavities.
Vapor barriers are sheets of plastic or other material placed on one side of insulation sheets.