Tables of Building Material R-values

The R-values for specific assemblies like doors and glazing in the table below are generalizations because they can vary significantly based on special materials that the manufacturer uses.  For instance, using argon gas in a double pane insulating glass unit will dramatically improve the R-value.  Consult manufacturer literature for values specific to your project.

MATERIALTHICKNESSR-VALUE (F° · SQ.FT. · HR/BTU)
Air Space

Minimum 1/2″ up to 4″
1.00
 

Building Board

Gypsum Wall Board1/2″0.45
Gypsum Wall Board5/8″0.5625
Plywood1/2″0.62
Plywood1″1.25
Fiber board sheathing1/2″1.32
Medium Density Particle Board1/2″0.53
 

Insulating Materials

R-11 Mineral Fiber with 2×4 wood studs @ 16″ OC
12.44
R-19 Mineral Fiber with 2×6 wood studs @ 24″ OC
19.11
Expanded Polystyrene (Extruded)1″5.00
Polyurethane Foam (Foamed on site)1″6.25
Polyisocyanurate (Foil Faced)1″7.20
 

Masonry and Concrete

Common Brick4″0.80
Face Brick4″0.44
Concrete Masonry Unit (CMU)4″0.80
Concrete Masonry Unit (CMU)8″1.11
Concrete Masonry Unit (CMU)12″1.28
Concrete 60 pounds per cubic foot1″0.52
Concrete 70 pounds per cubic foot1″0.42
Concrete 80 pounds per cubic foot1″0.33
Concrete 90 pounds per cubic foot1″0.26
Concrete 100 pounds per cubic foot1″0.21
Concrete 120 pounds per cubic foot1″0.13
Concrete 150 pounds per cubic foot1″0.07
Granite1″0.05
Sandstone / Limestone1″0.08
 

Siding

Aluminum / Vinyl (not insulated)
0.61
Aluminum / Vinyl (1/2″ insulation)
1.80
 

Flooring

Hardwood3/4″0.68
Tile
0.05
Carpet with fiber pad
2.08
Carpet with rubber pad
1.23
 

Roofing

Asphalt Shingles
0.44
Wood Shingles
0.97
 

Glazing

Single Pane1/4″0.91
Double Pane with 1/4″ air space
1.69
Double Pane with 1/2″ air space
2.04
Double Pane with 3/4″ air space
2.38
Triple Pane with 1/4″ air spaces
2.56
Triple Pane with 1/2″ air spaces
3.23
 

Doors

Wood, solid core1 3/4″2.17
Solid insulated metal door, polystyrene insulation

1.5″ – 2″2.20 – 11.00

The values in the table above were taken from a number of sources including: the ASHRAE Handbook of FundamentalsColoradoENERGY.org, and Building Construction Illustrated by Francis D.K. Ching. Other minor sources were also used. We do not test materials or assemblies.
Source: Archtoolbox


JJ Greive

JJ & Suzanne are both licensed, highly skilled inspectors and educators. We are the authors of our class curriculum, and truly enjoy sharing this with our students

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