What is the R value of cardboard?

Answer

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.
Reference:
Q&A Related to "What is the R value of cardboard?"
All insulating materials, and all building materials for that matter, have a corresponding R-value that is based on the material, its thickness and its density. Four-inch-thick cellulose
http://www.ehow.com/info_8111694_insulation-rvalue...
Cardboard has calories! But lacks any other nutritional value, and may
http://www.chacha.com/question/what-is-the-nutriti...
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
http://wiki.answers.com/Q/What_is_the_r_value_of_d...
Here's the simple version of the answer. R-7 for a 24" thick wall. I found that on this web site. Energy Value of Masonry (brick, block) Construction Homes; Thermal Mass, R-value
http://www.quora.com/Materials-Science/What-is-the...
About -  Privacy -  Careers -  Ask Blog -  Mobile -  Help -  Feedback  -  Sitemap  © 2015 Ask.com