R-Value of Building Materials

R/ R/ R/ R/ Material Thick- Material Thick- Inch Inch 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 Rigid fiberglass (> 4 lb/ft3) 4.00 Plywood (�⁄₈ inch) 0.77 Expanded Polystyrene (bead- (�⁄₄ inch) 0.93 4.00 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 (�⁄₈ inch) 0.82 2 x 4 (3 �⁄₂ inch) 4.38 Hardwood Flooring 0.91 2 x 6 (5 �⁄₂ inch) 6.88 (�⁄₄ inch) 0.68 Cedar Logs and Lumber 1.33 Tile, Linoleum 0.05 Sheathing Materials 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 Single Glass 0.91 �⁄₄ inch 0.94 w/storm 2.00 Fiberboard 2.64 Double insulating glass �⁄₂ inch 1.32 1.61 (�⁄₁₆ inch) air space ��⁄₃₂ inch 2.06 (�⁄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 Triple insulating glass 1.85 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 Metal Insulating 0.29 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