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
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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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