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?"
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
Cardboard has calories! But lacks any other nutritional value, and may
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
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
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