R-Value of Building Materials
                                                  R/        R/                                              R/        R/ 
               Material                          Inch     Thick-         Material                          Inch     Thick-
                                                           ness                                                      ness
               Insulation Materials                                      Fiberglass (�⁄₄ inch)                       3.00
               Fiberglass Batt                     3.14                    (1 inch)                                  4.00
               Fiberglass Blown (attic)            2.20                    (1 �⁄₂ inch)                              6.00
               Fiberglass Blown (wall)             3.20                  Extruded Polystyrene (�⁄₄ inch)             3.75
               Rock Wool Batt                      3.14                    (1 inch)                                  5.00
               Rock Wool Blown (attic)             3.10                    (1 �⁄₂ inch)                              7.50
               Rock Wool Blown (wall)              3.03                  Foil-faced Polyisocyanurate                 5.40
               Cellulose Blown (attic)             3.13                    (�⁄₄ inch)
               Cellulose Blown (wall)              3.70                    (1 inch)                                  7.20
               Vermiculite                         2.13                    (1 �⁄₂ inch)                              10.80
               Air-entrained Concrete              3.90                  Siding Materials
               Urea terpolymer foam                4.48                  Hardboard (�⁄₂ inch)                        0.34
                                       3
               Rigid fiberglass (> 4 lb/ft )       4.00                  Plywood (�⁄₈ inch)                          0.77
               Expanded Polystyrene (bead-         4.00                     (�⁄₄ inch)                               0.93
                 board)                                                  Wood Bevel Lapped                           0.80
               Extruded Polystyrene                5.00                  Aluminum, Steel, Vinyl                      0.61
               Polyurethane (foamed-in-place)      6.25                       (hollow backed)
               Polyisocyanurate (foil-faced)       7.20                     (w/ �⁄₂ inch Insulating board)           1.80
               Construction Materials                                    Brick 4 inch                                0.44
               Concrete Block 4 inch                        0.80         Interior Finish Materials
               Concrete Block 8 inch                        1.11         Gypsum Board (drywall �⁄₂ inch)             0.45
               Concrete Block 12 inch                       1.28          (�⁄₈ inch)                                 0.56
               Brick 4 inch common                          0.80         Paneling (�⁄₈ inch)                         0.47
               Brick 4 inch face                            0.44         Flooring Materials
               Poured Concrete                     0.08                  Plywood                            1.25      
               Soft Wood Lumber                    1.25                     (�⁄₄ inch)                               0.93
                 2 inch nominal (1 �⁄₂ inch)                1.88         Particle Board (underlayment)      1.31      
                 2 x 4 (3 �⁄₂ inch)                         4.38          (�⁄₈ inch)                                 0.82
                 2 x 6 (5 �⁄₂ inch)                         6.88         Hardwood Flooring                  0.91      
               Cedar Logs and Lumber               1.33                     (�⁄₄ inch)                               0.68
               Sheathing Materials                                       Tile, Linoleum                              0.05
                                                                         Carpet (fibrous pad)                        2.08
               Plywood                             1.25                     (rubber pad)                             1.23
                 �⁄₄ inch                                   0.31         Roofing Materials
                 �⁄₈ inch                                   0.47         Asphalt Shingles                            0.44
                 �⁄₂ inch                                   0.63         Wood Shingles                               0.97
                 �⁄₈ inch                                   0.77         Windows
                 �⁄₄ inch                                   0.94         Single Glass                                0.91
               Fiberboard                          2.64                    w/storm                                   2.00
                 �⁄₂ inch                                   1.32         Double insulating glass                     1.61
                 ��⁄₃₂ inch                                 2.06           (�⁄₁₆ inch) air space
                                                                          (�⁄₄ inch air space)                       1.69
                      (�⁄₂ inch air space)                            2.04           Doors
                      (�⁄₄ inch air space)                            2.38           Wood Hollow Core Flush                           2.17
                      (�⁄₂ inch w/ low-E 0.20)                        3.13                (1 �⁄₄ inch)
                       (w/ suspended film)                            2.77              Solid Core Flush (1 �⁄₄ inch)                 3.03
                       (w/ 2 suspended films)                         3.85              Solid Core Flush (2 �⁄₄ inch)                 3.70
                       (w/ suspended film and low-E)                  4.05              Panel Door w/ �⁄₁₆ inch Panels                1.85
                     Triple insulating glass                          2.56                (1 �⁄₄ inch)
                      (�⁄₄ inch air spaces)                                          Storm Door (wood 50% glass)                      1.25
                      (�⁄₂ inch air spaces)                           3.23              (metal)                                       1.00
                     Addition for tight fitting drapes                0.29           Metal Insulating                                 15.00
                       or shades, or closed blinds                                        (2 inch w/ urethane)
                                                                                     Air Films
                                                                                     Interior Ceiling                                 0.61
                                                                                     Interior Wall                                    0.68
                                                                                     Exterior                                         0.17
                                                                                     Air Spaces
                                                                                     �⁄₂ inch to 4 inch approximately                 1.00
     262                                                                                                                          Appendix 1