JA4.6      

JA4.7 MB

 

Table 4.6.1 – Physical Properties of Materials

Code

Description

R-value

 

Thickness

Conductivity

Density

Specific Heat

AR02

Asphalt Shingle & Siding

0.44

 

 

70.0

0.35

BP01

Building Paper, Permeable Felt

0.06

 

 

 

 

PW03

Plywood 1/2 in.

0.63

0.0417

0.0667

34.0

0.29

GP01

Gypsum Board 1/2 in.

0.45

0.0417

0.0926

50.0

0.26

BR01

Built-up Roofing 3/8 in.

0.33

0.0313

0.0939

70.0

0.35

PW05

Plywood 3/4 in.

0.94

0.0625

0.0667

34.0

0.29

PW04

Plywood 5/8 in.

0.78

0.0521

0.0667

34.0

0.29

CP01

Carpet with Fibrous Pad

2.08

 

 

 

0.34

PB01

Particle Board Low Density 3/4 in.

1.39

0.0625

0.0450

75.0

0.31

SC01

Stucco 1 in.

0.20

0.0833

0.4167

116.0

0.20

WD05

Wood, Soft 4 in.

5.00

0.3333

0.0667

32.0

0.33

WD11

Wood, Hard 3/4 in.

0.68

0.0625

0.0916

45.0

0.30

-CC03

Heavy Wt. Dried Aggregate 4 in.

0.44

0.3333

0.7576

140.0

0.20

CC14

Heavy Wt. Undried Aggregate 4 in.

0.32

0.3333

1.0417

140.0

0.20

AC02

1/2 in. Acoustic Tile

1.26

0.0417

0.0330

18.0

0.32

AL33

Air Layer 4 in. or more, Horizontal Roof

0.92

1.0000

0.4167

120.0

0.20

CP01

Carpet with Fibrous Pad

2.08

 

 

 

0.34

Custom

Concrete

0.11

 

 

144.0

0.20

Custom

Light Weight CMU

0.35

 

 

105.0

0.20

Custom

Medium Weight CMU

0.35

 

 

115.0

0.20

Custom

Normal Weight CMU

0.35

 

 

       125.0

0.20

Custom

Earth (Soil)

3.00

1.5000

0.5000

85.0

0.20

Custom

Logs 6 in.

7.50

0.5000

0.0667

32.0

0.33

Custom

Logs 8 in.

10.00

0.6667

0.0667

32.0

0.33

Custom

Logs 10 in.

12.49

0.8333

0.0667

32.0

0.33

Custom

Logs 12 in.

14.99

1.0000

0.0667

32.0

0.33

Custom

Logs 14 in.

17.49

1.1667

0.0667

32.0

0.33

Custom

Logs 16 in.

19.99

1.3333

0.0667

32.0

0.33

Custom

Earth 12 in.

2.00

1.0000

0.5000

85.0

0.20

Custom

Vented crawlspace

6.00

NA

NA

NA

NA

Custom

7/8" layer of stucco of R-0.18

0.18

0.0729

0.4167

116.0

0.20

Custom

Straw bale

30.00

 

 

 

 

Custom

Acoustic tile + Metal

0.50

0.0417

0.0330

18.0

0.32

Custom

OSB 7/16 in.

0.44

0.4375

0.0667

34.0

0.29

Table 4.6.2 – Rules for Calculating Mass Thermal Properties From Published Values

Property

Units

Rule for Calculation

Heat Capacity (HC)

 

Btu/ºF-ft²

From Table 4.3.5, Table 4.3.6, or Table 4.3.7

U-factor

 

Btu/h-ºF-ft²

From Table 4.3.5, Table 4.3.6, or Table 4.14

C-factor

Btu/h-ºF-ft²

From Table 4.3.5, Table 4.3.6, or Table 4.3.7

Thickness (T)

Ft

From Table 4.3.5, Table 4.3.6, or Table 4.3.7

Specific Heat (SH)

Btu/ºF-lb

Assume that the specific heat of all concrete and masonry materials is 0.20 Btu/ºF-lb and that the specific heat of wood or straw (see Table 4.3.11 and Table 4.3.12) is 0.39 Btu/ºF-lb.

Weight (W)

lb/ft²

Divide the HC by the assumed specific heat. Wall weight is used with the low-rise residential standards to define a high mass wall.

Density (D)

lb/ft³

Multiply the weight (as calculated above) by the thickness (T)

Conductivity (C)

Btu/h-ºF-ft

Divide the published C-factor by the thickness (T). When only a U-factor is published, calculate the C-factor by assuming an exterior air film of 0.17 and an interior air film of 0.68.

 

 

ADDENDUM TO JA4 (See Notification :_ www.energy.ca.gov/title24/2013standards/)

 

 

Table 4.3.1(a) – U-factors of Wood Framed Walls with 5/8 gypsum1 (Only to be used when 5/8 inch gypsum is installed)

Spacing

Cavity Insulation

Nominal Framing Size

 

Rated R-value of Continuous Insulation 3

 

 

 

 

R-0

R-2

R-4

R-5

R-6

R-7

R-8

 

 

A

B

C

D

E

 F

G

 

16 in. OC

None

Any

1

0.343

0.208

0.145

0.126

0.112

0.100

0.091

 

 

R-11

2x4

2

0.109

0.087

0.073

0.067

0.063

0.059

0.055

 

 

R-13

2x4

3

0.101

0.081

0.068

0.063

0.059

0.056

0.052

 

 

R-15 2

2x4

4

0.094

0.076

0.064

0.059

0.055

0.052

0.049

 

 

R-19 

2x6

5

0.073

0.062

0.054

0.050

0.048

0.045

0.043

 

 

R-212

2x6

6

0.068

0.058

0.050

0.047

0.045

0.041

0.040

 

 

R-22

2x6

7

0.071

0.061

0.053

0.050

0.047

0.044

0.042

 

 

R-19

2x8

8

0.064

0.056

0.050

0.047

0.044

0.042

0.040

 

 

R-22

2x8

9

0.060

0.052

0.046

0.044

0.042

0.040

0.038

 

 

R-25

2x8

10

0.056

0.049

0.043

0.041

0.039

0.037

0.036

 

 

R-302

2x8

11

0.055

0.048

0.043

0.040

0.039

0.037

0.035

 

24 in. OC

None

Any

12

0.361

0.210

0.147

0.127

0.113

0.101

0.091

 

 

R-11

2x4

13

0.105

0.085

0.071

0.066

0.061

0.058

0.055

 

 

R-13

2x4

14

0.097

0.078

0.066

0.061

0.057

0.054

0.052

 

 

R-15

2x4

22

0.090

0.073

0.062

0.058

0.054

0.051

0.049

 

 

R-19

2x6

15

0.070

0.060

0.052

0.049

0.047

0.044

0.043

 

 

R-212

2x6

16

0.065

0.056

0.049

0.046

0.044

0.041

0.040

 

 

R-22

2x6

17

0.068

0.059

0.051

0.048

0.046

0.043

0.042

 

 

R-19

2x8

18

0.062

0.054

0.048

0.046

0.044

0.042

0.041

 

 

R-22

2x8

19

0.057

0.050

0.045

0.043

0.041

0.039

0.038

 

 

R-25

2x8

20

0.054

0.047

0.042

0.040

0.038

0.036

0.036

 

 

R-301

2x8

21

0.053

0.046

0.041

0.039

0.037

0.036

0.035

 

Notes

1. The 5/8 inch gypsum board must be verified by the enforcement agency. If 5/8 inch gypsum board is not installed use table 4.3.1.

2. Higher density fiberglass batt is required in these cases.

3. Continuous insulation may be installed on either the inside or the exterior of the wall, or both.

This table contains U-factors for wood framed walls, which are typical of low-rise residential buildings and Type V nonresidential buildings. If continuous insulation is not used, then choices are made from Column A. In this case, the insulation is installed in the cavity between the framing members. When continuous insulation is used, this is typically installed on the exterior side of the wall, but can also be used on the inside. The continuous insulation is typically a rigid polystyrene or polyisocyanurate foam insulation.

When this table is used manually, the R-value of continuous insulation shall be equal to or greater than the R-value published in the continuous insulation columns. No interpolation is permitted when data from the table is used manually. CEC approved compliance software, however, may determine the U-factor for any amount of continuous insulation or for unusual construction assemblies using Equation 4-1 and Equation 4-2.