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The best approach for a vented attic in a cold climate is installing a layer of drywall with a good coat of latex paint the paint creates a semi permeable vapor barrier.

Do you need vapor barrier blown insulation attic.

Most forms of attic insulation benefit from the addition of a vapor barrier to protect them from the harmful effects of moisture which can reduce their effectiveness over time. Most of the blanket insulation types have vapor barriers incorporated and can be very effective if installed properly. Your first job after the studs are in place is to fill those walls with insulation. The following are a few simple steps to help you undertake the task properly so your vapor barrier retains heat without damaging the insulation.

Lucy no you don t need a vapor barrier. You will see on which side is the vapor barrier. You do not need a vapor barrier. Thousands of houses have had insulation blown in without incident mostly because old houses are so leaky that there is little or no chance for water vapor to build up to cause the insulation to.

To assure proper protection of the vapor barrier you will need to cover the entire area of the attic. Plastic vapor barriers should only be installed in vented attics in climates with more than 8 000 heating degree days. The basics of air sealing are covered in this article. Not every wall does.

What you need is an air barrier that is at every step of the way you have to pay attention to airtightness. If you are not sure if you need insulation in your walls follow along with this flow chart. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. No the best option is to install un faced or loose fill fiberglass or cellulose on top of your drywall.

Air sealing an attic. Should you install a vapor barrier over preexisting attic insulation. Several layers of paint on the ceiling would qualify as a vapor barrier. 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.

Due to this inevitable fact it s actually better to omit a vapor barrier between the insulation and drywall of the ceiling below the attic. Do not add a vapor barrier on top of the insulation in your attic since the paper facing on the existing insulation is the vapor barrier. If you read the brief it points out the major concern with moisture in insulation is air leakage. The best way to answer this question in addition to considering the factors above would be to talk to a professional.

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