Table 3. R-Factors of building materials-continued

MIL-HDBK-1003/19

TABLE III.

R-Factors of building materials.

(Cont.)

R-Value

Density

Material and Description

per inch for listed

(lb/ft3) thickness thickness

Built-up roofing

--

0.33

Siding materials

Shingles

Asbestos-cement

120

--

0.21

Wood, 16-inch with 7-1/2-inch exposure

--

0.80

Wood, double 16-inch width with

12-inch exposure

--

1.19

Wood, plus insulating backer

board

6/16-inch

--

1.40

Siding

Asbestos-cement lapped

1/4-inch

--

0.21

Asphalt roof siding

--

0.15

Asphalt insulating siding

1/2-inch

--

1.46

Wood, drop (1-inch X 8-inch)

--

0.79

Wood, drop (1/2-inch X 8-inch lapped)

--

0.81

Wood, bevel (3/4-inch X 10-inch lapped)

--

1.05

Plywood, lapped

3/8-inch

--

0.59

Plywood

1/4-inch

--

0.31

3/8-inch

--

0.47

1/2-inch

--

0.62

5/8-inch

--

0.78

3/4-inch

--

0.94

Stucco

116

0.20

--

Sheathing, insulating board

1/2-inch

--

1.32

(regular density)

25/32-inch

--

2.04

Woods

Hardwoods (maple, oak)

45

0.91

--

Softwoods (fir, pine)

32

1.25

--

25/32-inch

32

--

0.98

1-5/8-inch

32

--

2.03

2-5/8-inch

32

--

3.28

3-5/8-inch

32

--

4.55

Particle board

Low density, 37 lb/ft3

1-inch

--

1.85

Medium density, 50 lb/ft3

1-inch

--

1.06

High density, 62.5 lb/ft3

1-inch

--

0.85

Wood doors, solid core

1-inch

--

1.56

1-1/4-inch

--

1.82

1-1/2-inch

--

2.04

2-inch

--

2.33

[*]Weights of blocks approximately 7-5/8-inch high by 15-3/8-inch long.

[**]Vermiculite, perlite, or mineral wool insulation.

57