Unfaced insulation is simply insulation without any vapor retardant such as plastic or paper.
Adding unfaced insulation attic.
In a cooling climate a good blanket of attic insulation helps keep the house cooler and reduces the load on air conditioning equipment.
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By adding insulation to your attic you ll not only reduce your monthly utility bills but also enjoy improved energy efficiency and greater comfort throughout the year.
The good news is that the solution to your problem isn t that difficult.
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What is the right insulation for an attic.
When insulating exterior walls you can increase the r value by adding sheathing to the insulation that is already there.
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For diy attic insulation you ve got two choices.
To increase attic insulation r.
Now that you ve air sealed your attic and basement check your attic insulation levels and add more if necessary.
Use unfaced batts only.
Nailing a layer of sheathing to exterior wall insulation can greatly increase the r value.
Faced insulation should not be placed on top of existing insulation in the attic.
Air migrates from warmer spaces toward colder spaces and insulation is designed to help prevent or at least slow that migration.
Typically houses in warm weather states should have an r 38 insulation in the attic whereas houses in cold climates should have r 49.
Once you ve decided which type is best for you examine the material options and prices to home in on the right product.
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These insulation levels will keep heated air from migrating out in winter.
Loose fill or batt the common term for blanket insulation.
Any new batt or roll insulation installed over existing insulation in the attic needs to be without a vapor retarder face.
As you ve discovered since you already had insulation in your attic the layer of new insulation you added should have been unfaced to prevent moisture from becoming trapped between the layers.
The attic is the easiest place to add insulation to improve your comfort and the energy efficiency of your home.
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I ve always said adding insulation to your attic is some of the best money you can spend to make your house more energy efficient but whether to use faced or unfaced insulation is a great question.
