Which side of insulation goes down?
Regardless of whether fiberglass insulation is installed in a wall, attic, or crawlspace; the paper facing should always face toward the inside of the home. That’s because the paper contains a layer of asphalt adhesive which prevents water vapor from passing through it.
What direction should the vapor barrier on insulation be installed?
The first layer should have the facing against the drywall to act as a vapor barrier. (The general rule for insulation is that the facing always goes toward the conditioned space.) The second layer of insulation should be unfaced so that moisture doesn’t collect between the layers.
How deep should cellulose insulation be in attic?
Do I Have Enough? No matter what kind of insulation you currently have in your attic, one quick way to determine if you need more is to look across the span of your attic. If your insulation is just level with or below your floor joists (i.e., you can easily see your joists), you should add more.
Does side of insulation face matter?
It should always face the warm-in-winter side. Thus, in cold climates, it should face the interior; in hot humid climates, it should face the exterior. If a vapor barrier is installed on the wrong side, it can trap moisture inside wall cavities causing condensation to accumulate.
Can you put vapor barrier on both sides of insulation?
On the interior, we exposed the 2×4 studs and installed fiberglass batts. Then we installed 1/2-inch foil-faced rigid foam followed by drywall. In that climate, will these “foam sandwich” walls trap moisture? A.
Can I install insulation myself?
With certain types of insulation materials, installing your own insulation is definitely doable—and you can save money not hiring a professional. Installing fiberglass or mineral wool insulation are simple DIY projects. Other insulation types, such as spray foam insulation, require the use of a professional.
Which is better blown-in fiberglass or cellulose?
At 3.5 per inch of material, the R-value of blown-in cellulose is 23% better per inch than fiberglass batts! According to research done at the Oak Ridge National Lab, fiberglass loses up to 50% of its R-value in very cold conditions; making cellulose a better choice for homes in northern climates.
What is the are value of insulation board?
Foam Board Insulation R-Value. Rigid foam insulation R-values range from R-4 to R-6.5 per inch of thickness, which is greater than many other insulating materials of the same thickness. This type of of insulation is effective at providing thermal resistance.
What is rigid insulation your value?
The thermal resistance of this material, or effectiveness at keeping heat from passing through, is known as rigid insulation R value. In general, rigid insulation R value is higher than that of other materials used as insulators.
What is the are value of drywall?
Drywall provides a thermal resistance R-value (in US units) of 0.32 for 3⁄8-inch board, 0.45 for 1⁄2-inch, 0.56 for 5⁄8-inch, and 0.83 for 1-inch board. In addition to increased R-value, thicker drywall has a higher sound transmission class.