Insulation R-Value Table

Insulation R-Value Table

Insulation Values For Commonly Found Materials

Component

R-Value Studs

R-Value Cavity

Assembly R-Value

Wall – Outside Air Film

0.17

0.17

Siding – Wood Bevel

0.80

0.80

Plywood Sheathing – 1/2″

0.63

0.63

3 1/2″ Fiberglass Batt

13.00

3 1/2″ Stud

4.38

1/2″ Drywall

0.45

0.45

Inside Air Film

0.68

0.68

Percent for 16″ o.c. + Additional studs

15%

85%

Total Wall Component R-Values

7.11

15.73

Wall Component U-Values

0.1406

0.0636

Total Wall Assembly R-Value

13.31

* This example is just for wood frame construction. Steel studs are a more complicated calculation.

R-Value Table – English (US) Units

Material

R/
Inch
hr·ft2·°F/Btu

R/
Thickness
hr·ft2·°F/Btu

Insulation Materials
Fiberglass Batts

3.14-4.30

   3 1/2″ Fiberglass Batt

11.00

   3 5/8″ Fiberglass Batt

13.00

   3 1/2″ Fiberglass Batt (high density)

15.00

   6 1/2″ Fiberglass Batt

19.00

   5 1/4″ Fiberglass Batt (high density)

21.00

   8″ Fiberglass Batt

25.00

   8″ Fiberglass Batt (high density)

30.00

   9 1/2″ Fiberglass Batt

30.00

   12″ Fiberglass Batt

38.00

Fiberglass Blown (attic)

2.20-4.30

Fiberglass Blown (wall)

3.70-4.30

Rock Wool Batt

3.14-4.00

Rock Wool Blown (attic)

3.10-4.00

Rock Wool Blown (wall)

3.10-4.00

Cellulose Blown (attic)

3.60-3.701

Cellulose Blown (wall)

3.80-3.901

Vermiculite

2.13

Autoclaved Aerated Concrete

1.05

Urea Terpolymer Foam

4.48

Rigid Fiberglass (> 4lb/ft3)

4.00

Expanded Polystyrene (beadboard)

4.00

Extruded Polystyrene

5.00

Polyurethane (foamed-in-place)

6.25

Polyisocyanurate (foil-faced)

7.20

Construction Materials
Concrete Block 4″

0.80

Concrete Block 8″

1.11

Concrete Block 12″

1.28

Brick 4″ common

0.80

Brick 4″ face

0.44

Poured Concrete

0.08

Soft Wood Lumber

1.25

   2″ nominal (1 1/2″)

1.88

   2×4 (3 1/2″)

4.38

   2×6 (5 1/2″)

6.88

Cedar Logs and Lumber

1.33

Sheathing Materials
Plywood

1.25

   1/4″

0.31

   3/8″

0.47

   1/2″

0.63

   5/8″

0.77

   3/4″

0.94

Fiberboard

2.64

   1/2″

1.32

   25/32″

2.06

Fiberglass (3/4″)

3.00

   (1″)

4.00

   (1 1/2″)

6.00

Extruded Polystyrene (3/4″)

3.75

   (1″)

5.00

   (1 1/2″)

7.50

Foil-faced Polyisocyanurate
(3/4″)

5.40

   (1″)

7.20

   (1 1/2″)

10.80

Siding Materials
Hardboard (1/2″)

0.34

Plywood (5/8″)

0.77

   (3/4″)

0.93

Wood Bevel Lapped

0.80

Aluminum, Steel, Vinyl
(hollow backed)

0.61

   (w/ 1/2″ Insulating board)

1.80

Brick 4″

0.44

 

Interior Finish Materials
Gypsum Board (drywall 1/2″)

0.45

   (5/8″)

0.56

Paneling (3/8″)

0.47

Flooring Materials
Plywood

1.25

   (3/4″)

0.93

Particle Board (underlayment)

1.31

   (5/8″)

0.82

Hardwood Flooring

0.91

   (3/4″)

0.68

Tile, Linoleum

0.05

Carpet (fibrous pad)

2.08

   (rubber pad)

1.23

Roofing Materials
Asphalt Shingles

0.44

Wood Shingles

0.97

Windows
Single Glass

0.91

   w/storm

2.00

Double insulating glass
(3/16″) air space

1.61

   (1/4″ air space)

1.69

   (1/2″ air space)

2.04

   (3/4″ air space)

2.38

   (1/2″ w/ Low-E 0.20)

3.13

   (w/ suspended film)

2.77

   (w/ 2 suspended films)

3.85

   (w/ suspended film and low-E)

4.05

Triple insulating glass
(1/4″ air spaces)

2.56

   (1/2″ air spaces)

3.23

Addition for tight fitting drapes or shades, or closed blinds

0.29

Doors
Wood Hollow Core Flush
(1 3/4″)

2.17

   Solid Core Flush (1 3/4″)

3.03

   Solid Core Flush (2 1/4″)

3.70

   Panel Door w/ 7/16″ Panels
(1 3/4″)

1.85

Storm Door (wood 50% glass)

1.25

   (metal)

1.00

Metal Insulating
(2″ w/ urethane)

15.00

Air Films
Interior Ceiling

0.61

Interior Wall

0.68

Exterior

0.17

Air Spaces
1/2″ to 4″ approximately

1.00