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What is the r value of 6 inch unfaced fiberglass insulation?

April 26, 2017fiberglass inch insulation unfaced value

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What is the r value of 6 inch unfaced fiberglass insulation?

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technically unfaced fiberglass insulation has an r value of 21 for 6 inches but thats if its perfectly installed, no gaps, no crushes, no air moving through it, no moisture, and its completely in contact with the interior heated surface. Since its unfaced, we assume it will have moisture and air moving through it and an average installation, it’s likely R-13 or less.