U-Values for common materials
Reference Table for "U" Values
"U" Value is the coefficient of transmission, i.e., the transmission of heat through the materials, which compose the building's "envelope," or outer shell.
"U" Value has an inverse relationship to "R" Value. For example, a building with material with an "R" Value of R-11 converts to an "U" Value of 0.09 ( 1/R or 1/11 = 0.09).
The following is a table of common materials and their corresponding "U" Value.
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Walls |
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Material |
Description |
"U" Factor |
| Flat Metal | 0" Fiberglass Insulation | 1.20 |
| 1" Fiberglass Insulation | 0.22 | |
| 2" Fiberglass Insulation | 0.12 | |
| 3" Fiberglass Insulation | 0.09 | |
| 4" Fiberglass Insulation | 0.07 | |
| 6" Fiberglass Insulation | 0.05 | |
| 8" Fiberglass Insulation | 0.041 | |
| 12" Fiberglass Insulation | 0.027 | |
| Masonry | 8" Brick | 0.41 |
| 12" Brick | 0.31 | |
| 16" Brick | 0.25 | |
| 8" Conic Block, Solid | 0.39 | |
| 12" Conic Block, Solid | 0.36 | |
| 4" Conic Block, Hollow | 0.51 | |
| 8" Conic Block, Hollow | 0.39 | |
| 12" Conic Block, Hollow | 0.37 | |
| Poured Concrete | 2" Thick | 0.99 |
| (140 lb. / ft3) | 4" Thick | 0.86 |
| 6" Thick | 0.75 | |
| 8" Thick | 0.67 | |
| 10" Thick | 0.61 | |
| 12" Thick | 0..55 | |
| Poured Concrete | 2" Thick | 0.62 |
| (80 lb. / ft.3) | 4" Thick | 0.42 |
| 6" Thick | 0.31 | |
| 8" Thick | 0.25 | |
| 10" Thick | 0.21 | |
| 12" Thick | 0.18 | |
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Doors |
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Material |
Description |
"U" Factor |
| Steel | No Fiberglas Insulation | 1.20 |
| Insulated | 0.65 | |
| Wood | 1" Thick | 0.64 |
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Roofs |
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Material |
Description |
"U" Factor |
| Flat Metal - Roof | 0" Fiberglass Insulation | 0.90 |
| 1" Fiberglass Insulation | 0.26 | |
| 2" Fiberglass Insulation | 0.16 | |
| 3" Fiberglass Insulation | 0.11 | |
| 4" Fiberglass Insulation | 0.071 | |
| 6" Fiberglass Insulation | 0.05 | |
| 8" Fiberglass Insulation | 0.039 | |
| 12" Fiberglass Insulation | 0.027 | |
| Wood - Roof | 0" Fiberglass Insulation | 0.48 |
| 1" Fiberglass Insulation | 0.21 | |
| 2" Fiberglass Insulation | 0.12 | |
| 3" Fiberglass Insulation | 0.10 | |
| 4" Fiberglass Insulation | 0.075 | |
| 6" Fiberglass Insulation | 0.052 | |
| 8" Fiberglass Insulation | 0.04 | |
| 12" Fiberglass Insulation | 0.027 | |
| Concrete Deck - Roof | 2" Thick | 0.30 |
| 3" Thick | 0.23 | |
| 4" Thick | 0.18 | |
| Sky Lights | Single Wall | 1.15 |
| Double Wall | 0.70 | |
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Material
Description
"U" Factor
Floor - Exterior exposureInsulated0.55 Un-Insulated0.81Go back to Heat Loss Calculation.
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Windows |
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Material |
Description |
"U" Factor |
| Glass | Single Pane | 1.22 |
| Double Pane | 0.70 | |
| Fiberglass Panels | 1.09 | |
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Cold Mass Specific Gravity |
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Material |
Specific Gravity |
| Steel | 0.12 |
| Aluminum | 0.23 |
| Copper | 0.09 |
| Cast Iron | 0.11 |
| Cement | 0.19 |
| Concrete (140# / ft3) | 0.16 |
| Sand & Stone | 0.19 |
| Glass | 0.16 |
| Rubber | 0.48 |
| Wood | 0.50 |