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. |