All walls have an R-value to measure heat loss resistance.
The R-value of a wall measures the resistance of heat flowing through the wall. The higher the R-value, the less heat the wall lets escape. Most walls are not constructed of a solid material, so to obtain an accurate R-value rating you must know what materials were used in the construction of the wall. With that knowledge, and a chart that specifies the R-value of individual materials, you can calculate the R-value of your wall.
Instructions
1. Determine the R-value of the wall covering. In most homes, a wall consists of ½-inch drywall. Each piece of drywall has an R-value of 0.45. Since you are likely to have drywall on both sides of the wall, multiply the single R-value of 0.45 by 2 to obtained the combined R-value of your drywall.
2. Determine the R-value for your wall studs. Studs create an air gap between the drywall sheets. When using studs in conjunction with drywall, your studs have an R-valve of 0.45. Do not multiply this value by the total amount of studs, since the R-value of the studs measures the air gap.
3. Determine the R-value of the insulation in the wall. Most walls use a rolled cellulose insulation stuffed between the layers of drywall. This type of insulation has an R-value of 3.8
4. Add the R-value of your wall covering, studs and insulation together to determine the total R-value of the wall.
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