Heat loss due to linear thermal bridging

The heat loss due to linear thermal bridging ( $H_{TB}$ ) is a physical quantity used when calculating the energy performance of buildings. It appears in both United Kingdom^[1] and Irish^[2] methodologies.

Calculation

The calculation of the heat loss due to linear thermal bridging is relatively simple, given by the formula below:^[3]

H_{TB}=y\sum A_{exp}

In the formula, $y=0.08$ if Accredited Construction details used, and $y=0.15$ otherwise, and $\sum A_{exp}$ is the sum of all the exposed areas of the building envelope,

References

[1]

[2]

[3]