JA4.5 Miscellaneous Construction
Table 4.5.1 – Doors
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.
Table 4.5.2 – 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 4.5.3 – 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.

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