R-Value of Building Materials
Material
Insulation Materials
Fiberglass Batt
Fiberglass Blown (attic)
Fiberglass Blown (wall)
Rock Wool Batt
Rock Wool Blown (attic)
Rock Wool Blown (wall)
Cellulose Blown (attic)
Cellulose Blown (wall)
Vermiculite
Air-entrained Concrete
Urea terpolymer foam
Rigid fiberglass (> 4 lb/ft3)
Expanded Polystyrene (beadboard)
Extruded Polystyrene
Polyurethane (foamed-in-place)
Polyisocyanurate (foil-faced)
Construction Materials
Concrete Block 4 inch
Concrete Block 8 inch
Concrete Block 12 inch
Brick 4 inch common
Brick 4 inch face
Poured Concrete
Soft Wood Lumber
2 inch nominal (1 �⁄₂ inch)
2 x 4 (3 �⁄₂ inch)
2 x 6 (5 �⁄₂ inch)
Cedar Logs and Lumber
Sheathing Materials
Plywood
�⁄₄ inch
�⁄₈ inch
�⁄₂ inch
�⁄₈ inch
�⁄₄ inch
Fiberboard
�⁄₂ inch
��⁄₃₂ inch
R/
Inch
R/
Thickness
3.14
2.20
3.20
3.14
3.10
3.03
3.13
3.70
2.13
3.90
4.48
4.00
4.00
5.00
6.25
7.20
0.08
1.25
1.33
1.25
2.64
0.80
1.11
1.28
0.80
0.44
1.88
4.38
6.88
0.31
0.47
0.63
0.77
0.94
1.32
2.06
Material
R/
Inch
Fiberglass (�⁄₄ inch)
(1 inch)
(1 �⁄₂ inch)
Extruded Polystyrene (�⁄₄ inch)
(1 inch)
(1 �⁄₂ inch)
Foil-faced Polyisocyanurate
(�⁄₄ inch)
(1 inch)
(1 �⁄₂ inch)
Siding Materials
Hardboard (�⁄₂ inch)
Plywood (�⁄₈ inch)
(�⁄₄ inch)
Wood Bevel Lapped
Aluminum, Steel, Vinyl
(hollow backed)
(w/ �⁄₂ inch Insulating board)
Brick 4 inch
Interior Finish Materials
Gypsum Board (drywall �⁄₂ inch)
(�⁄₈ inch)
Paneling (�⁄₈ inch)
Flooring Materials
Plywood
(�⁄₄ inch)
Particle Board (underlayment)
(�⁄₈ inch)
Hardwood Flooring
(�⁄₄ inch)
Tile, Linoleum
Carpet (fibrous pad)
(rubber pad)
Roofing Materials
Asphalt Shingles
Wood Shingles
Windows
Single Glass
w/storm
Double insulating glass
(�⁄₁₆ inch) air space
(�⁄₄ inch air space)
R/
Thickness
3.00
4.00
6.00
3.75
5.00
7.50
5.40
7.20
10.80
0.34
0.77
0.93
0.80
0.61
1.80
0.44
0.45
0.56
0.47
1.25
1.31
0.91
0.93
0.82
0.68
0.05
2.08
1.23
0.44
0.97
0.91
2.00
1.61
1.69
(�⁄₂ inch air space)
(�⁄₄ inch air space)
(�⁄₂ inch w/ low-E 0.20)
(w/ suspended film)
(w/ 2 suspended films)
(w/ suspended film and low-E)
Triple insulating glass
(�⁄₄ inch air spaces)
(�⁄₂ inch air spaces)
Addition for tight fitting drapes
or shades, or closed blinds
262
2.04
2.38
3.13
2.77
3.85
4.05
2.56
3.23
0.29
Doors
Wood Hollow Core Flush
(1 �⁄₄ inch)
Solid Core Flush (1 �⁄₄ inch)
Solid Core Flush (2 �⁄₄ inch)
Panel Door w/ �⁄₁₆ inch Panels
(1 �⁄₄ inch)
Storm Door (wood 50% glass)
(metal)
Metal Insulating
(2 inch w/ urethane)
Air Films
Interior Ceiling
Interior Wall
Exterior
Air Spaces
�⁄₂ inch to 4 inch approximately
2.17
3.03
3.70
1.85
1.25
1.00
15.00
0.61
0.68
0.17
1.00
Appendix 1