Thermal bridging and PSI values (heat loss values) are factored into SAP calculations and have a significant impact on Part L compliance.
Thermal bridging relates to the heat lost within the joints of a building and quantifies the amount of heat that escapes (the PSI value). Thermal bridging is often accountable for 15-30% of the total heat loss within a property.
Poor thermal bridging means increased energy demand, making it harder to achieve Part L compliance.
- Some construction types perform better than others, with an abundance of
accredited construction details that can be followed to minimise thermal
bridging - If recognised construction details are not available, default PSI values must
be entered. This is likely to cause the SAP calculation to fail on the latest
2021 Part L regulations. - Constructions that do not have recognised details will therefore require
bespoke calculations. This is common with construction types such as system builds, timber frame, steel frame and ICF. - Bespoke calculations make certain that accurate psi values are reflected,
based on the specific construction details provided
Get in touch if you require bespoke Thermal Bridging Calculations – our team are happy to help.