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Nominal Lumber SizeCavity DepthInsulation R-Values When Compressed In Framing Cavity
2x1211 1/4"373830
2x109 1/4"3235303025
2x87 1/4"2730252724222119
2x65 1/2"212220192118
2x43 1/2"141513151311
2x32 1/2"11108.9
2x21 1/2"6.66.2
Product R-ValuesR-38R-38CR-30R-30CR-25R-22R-21R-19R-15R-13R-11
Standard Thickness12"10 1/4"9 1/2"8 1/4"8"6 3/4"5 1/2"6 1/4"3 1/2"3 1/2"3 1/2"
Notes:1. Minimum dressed lumber thickness per U.S. Dept. of Commerce Publication PS 20-70.
2. Above listing for information only: some products will resist compression into framing cavities.
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Name:  Owens Corning Fiberglass Batt Compression Chart by  bartcubbins bartcubbins 
Description:  R-values for compressed fiberglass batt insulation. Data from Owens Corning:
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