## 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.