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
HC 40c. HT 40c. MM $5.00. MV $235.00. TH 40c. TY 40c. UC 40c. UH 40c. UT 40c. UV 40c. UX 40c. UY 40c. VC 40c. VH 40c. VT 40c. VU 40c. VX 40c. VY 40c. XC $2.00. XH 40c. XT 40c. XU
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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