Oh, that's a lovely question! The "r value" of a sheet of cardboard refers to its thermal resistance, which helps determine how well it insulates against heat transfer. While cardboard isn't typically used for insulation, you can still appreciate its versatility and eco-friendly qualities in art and crafts. Just remember, every material has its unique beauty and purpose!
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The "r value" of a material refers to its thermal resistance, which is a measure of how well it resists heat transfer. Cardboard is not typically assigned an "r value" as it is not a standardized building insulation material like fiberglass or foam board. However, if you are looking to insulate with cardboard, you would need to consider its thickness, density, and other factors to estimate its insulating properties. It's important to note that cardboard is not as effective as traditional insulation materials in terms of thermal resistance.
The U value is the inverse of the R value. For R value 19 insulation the U value is 1/19, or 0.0526.
"r" you kidding?
One-eighth of a quantity ( r ) can be calculated by dividing ( r ) by 8. Mathematically, it can be represented as ( \frac{r}{8} ). This means that if you have a value for ( r ), you can find one-eighth of that value by simply dividing it by 8.
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Drywall provides an R-value of 0.32 for 3/8" board, 0.45 for 1/2" board, 0.56 for 5/8" and 0.83 for 1" board. In addition to increased R-value, thicker drywall has a higher STC.