|
Description |
|
U-factor (Btu/ºF-ft²) |
|
A | ||
|
Uninsulated single-layer metal swinging doors or non-swinging doors, including single-layer uninsulated access hatches and uninsulated smoke vents: |
1 |
1.45 |
|
Uninsulated double-layer metal swinging doors or non-swinging doors, including double-layer uninsulated access hatches and uninsulated smoke vents: |
2 |
0.70 |
|
Insulated metal swinging doors, including fire-rated doors, insulated access hatches, and insulated smoke vents: |
3 |
0.50 |
|
Wood doors, minimum nominal thickness of 1-3/4 in. (44 mm), including panel doors with minimum panel thickness of 1-1/8 in. (28 mm), and solid core flush doors, and hollow core flush doors: |
4 |
0.50 |
|
Any other wood door: |
5 |
0.60 |
|
Uninsulated single layer metal roll up doors including fire rated door |
6 |
1.45 |
|
Insulated single layer metal sectional doors, minimum insulation nominal thickness of 1-3/8 inch; expanded polystyrene (R-4 per inch). |
7 |
0.179 |
|
Source: ASHRAE 90.1-2007, Section A7. | ||
|
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 |
|
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 : http://www.energy.ca.gov/title24/2016standards/).
|
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 |
R-10 |
| |||||
|
A |
B |
C |
D |
E |
F |
G |
H |
| |||||
|
11 |
None |
Any |
1 |
0.343 |
0.208 |
0.145 |
0.126 |
0.112 |
0.100 |
0.091 |
0.077 |
| |
|
R-11 |
2x4 |
2 |
0.109 |
0.087 |
0.073 |
0.067 |
0.063 |
0.059 |
0.055 |
0.050 |
| ||
|
R-13 |
2x4 |
3 |
0.101 |
0.081 |
0.068 |
0.063 |
0.059 |
0.056 |
0.052 |
0.047 |
| ||
|
R-15 2 |
2x4 |
4 |
0.094 |
0.076 |
0.064 |
0.059 |
0.055 |
0.052 |
0.049 |
0.045 |
| ||
|
R-19 |
2x6 |
5 |
0.073 |
0.062 |
0.054 |
0.050 |
0.048 |
0.045 |
0.043 |
0.040 |
| ||
|
R-212 |
2x6 |
6 |
0.068 |
0.058 |
0.050 |
0.047 |
0.045 |
0.041 |
0.040 |
0.038 |
| ||
|
R-22 |
2x6 |
7 |
0.071 |
0.061 |
0.053 |
0.050 |
0.047 |
0.044 |
0.042 |
0.039 |
| ||
|
R-19 |
2x8 |
8 |
0.064 |
0.056 |
0.050 |
0.047 |
0.044 |
0.042 |
0.040 |
0.038 |
| ||
|
R-22 |
2x8 |
9 |
0.060 |
0.052 |
0.046 |
0.044 |
0.042 |
0.040 |
0.038 |
0.036 |
| ||
|
R-25 |
2x8 |
10 |
0.056 |
0.049 |
0.043 |
0.041 |
0.039 |
0.037 |
0.036 |
0.034 |
| ||
|
R-302 |
2x8 |
11 |
0.055 |
0.048 |
0.043 |
0.040 |
0.039 |
0.037 |
0.035 |
0.033 |
| ||
|
24 in. OC |
None |
Any |
12 |
0.361 |
0.210 |
0.147 |
0.127 |
0.113 |
0.101 |
0.091 |
0.077 |
| |
|
R-11 |
2x4 |
13 |
0.105 |
0.085 |
0.071 |
0.066 |
0.061 |
0.058 |
0.055 |
0.049 |
| ||
|
R-13 |
2x4 |
14 |
0.097 |
0.078 |
0.066 |
0.061 |
0.057 |
0.054 |
0.052 |
0.046 |
| ||
|
R-15 |
2x4 |
22 |
0.090 |
0.073 |
0.062 |
0.058 |
0.054 |
0.051 |
0.049 |
0.04 |
| ||
|
R-19 |
2x6 |
15 |
0.070 |
0.060 |
0.052 |
0.049 |
0.047 |
0.044 |
0.043 |
0.039 |
| ||
|
R-212 |
2x6 |
16 |
0.065 |
0.056 |
0.049 |
0.046 |
0.044 |
0.041 |
0.040 |
0.037 |
| ||
|
R-22 |
2x6 |
17 |
0.068 |
0.059 |
0.051 |
0.048 |
0.046 |
0.043 |
0.042 |
0.038 |
| ||
|
R-19 |
2x8 |
18 |
0.062 |
0.054 |
0.048 |
0.046 |
0.044 |
0.042 |
0.041 |
0.037 |
| ||
|
R-22 |
2x8 |
19 |
0.057 |
0.050 |
0.045 |
0.043 |
0.041 |
0.039 |
0.038 |
0.035 |
| ||
|
R-25 |
2x8 |
20 |
0.054 |
0.047 |
0.042 |
0.040 |
0.038 |
0.036 |
0.036 |
0.033 |
| ||
|
R-301 |
2x8 |
21 |
0.053 |
0.046 |
0.041 |
0.039 |
0.037 |
0.036 |
0.035 |
0.033 |
| ||
|
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. Commission 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.