Attic Insulation Vapor Retarder

In any case the vapor barrier must point to the warm side.

Attic insulation vapor retarder.

Moisture moves by two transport mechanism. Cima does not recommend the use of vapor barriers with cellulose insulation except in circumstances of exceptionally high moisture levels such as an indoor pool facility or very cold climates. 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. The older term vapor barrier is still used even though vapor diffusion retarder is more accurate.

Whether or not you need a vapor retarder hinges on three main factors your climate your home and the location of the wall you re insulating. With our vapor barrier installation services there will be no issue of the crawl space of your home becoming a residence for pests bats and rodents. If this is accomplished and a similar air infiltration retarder is installed in sidewalls mechanical ventilation such as a heat recovery ventilator should be installed to prevent trapping air pollutants and moisture within the house. Plastic vapor barriers should only be installed in vented attics in climates with more than 8 000 heating degree days.

That s because cellulose is the only insulation that actually manages moisture. Attic insulation should always be installed with the paper backing facing toward the living space the ceiling in this case. This barrier is meant to keep moisture from getting to the insulation in the walls and ceilings and it is required by building codes when insulating most houses. Vapor barriers are sheets of plastic or other material placed on one side of insulation sheets.

A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. Sounds like a good idea but the vast majority of moisture problems are caused by air leakage not diffusion even in places like maine. A vapor barrier or vapor diffusion retarder is a material that reduces the rate at which water vapor can move through a material. To know if you need a vapor retarder ask yourself a few basic questions.

Air movement and diffusion. Insulation labs is a name to reckon with for efficient vapor barrier installation services. Stop worrying so much about vapor retarders. Do the air sealing.

This acts as a barrier to keep heated moist air from rising up into the attic during cold weather. Adding a second vapor barrier could cause condensation to become trapped in the insulation between the two vapor barriers. If installed in an attic a continuous vapor retarder is usually used to reduce air infiltration.