Building Elements - Heat Loss vs. Thermal Resistivity
Thermal resistance in building elements like walls, floors and roofs above and below the ground.
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Thermal resistance in some common building elements are indicated in the table below. The values can be used to approximately heat loss calculations from buildings.
| Thermal Resistance Inside and Outside Walls | Resistance (m2K/W) | ||
|---|---|---|---|
| Ri = 1/fi 1) | Ro = 1/fo 1) | Ri+ Ro | |
| Building parts against the surrounding environment | 0.13 | 0.04 | 0.17 |
| Building parts others | 0.13 | 0.13 | 0.26 |
| Thermal Resistance for Building Elements against Earth | Resistance (m2K/W) |
|---|---|
| Re | |
| Floors 0.5 m above to 0.5 below earth bound, 0-1 m from inside outside wall - without cold bridge protection | 0.2 |
| Floors 0.5 m above to 0.5 below earth bound - with cold bridge protection | 1.0 |
| Center-field above 1 m from inside outside wall | 1.5 |
| Basement floors 0.5 m below earth bound | 2.0 |
| Basement walls under earth bound, the whole wall against the earth, where h is the basement floors level below the earth bound (m) | 0.2 + 0.3 h |
| Basement walls under earth bound, basement floor against the earth and partly against air | 2.0 |
- 1 K/W = 0.5275 (h oF)/Btu
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