What is the R value of cardboard?


In general cardboard has an R Value, insulating value, of three or four, this is actually lower than the R Value of still air, five. R Value is usually given per inch and there better options than cardboard for insulation.
Q&A Related to "What is the R value of cardboard?"
R-Values are usually stated without any units, such as R-13 or R-24. The units are actually hr-ft²-°F/Btu, which measures how long it takes a unit of heat to move through
These blue WWII OPA tokens are actually pretty common - worth a few cents apiece.
The "r value" is an insulation rating.namely, a material's ability to resist heat flow. The larger the number, the more effective. This measure was created to discourage
: 35 x 11.5 x 4.5 inches & Shipping Weight: 8.5 pounds. Hope
About -  Privacy -  Careers -  Ask Blog -  Mobile -  Help -  Feedback  -  Sitemap  © 2014 Ask.com