# Heat loss due to linear thermal bridging

The heat loss due to linear thermal bridging () 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]

In the formula, if Accredited Construction details used, and otherwise, and is the sum of all the exposed areas of the building envelope,

## References

1. "User Manual, JPA Designer" (PDF). JPA Technical Literature. Archived from the original (PDF) on 2007-10-08. Retrieved 2007-07-06. External link in |work= (help)
2. "Dwelling Energy Assessment Procedure". Sustainable Energy Ireland. 2006. Archived from the original on 2007-09-28. Retrieved 2007-07-06.
3. "Steel Construction and Thermal Bridging". British Constructional Steelwork Association. Retrieved 2007-07-06.