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Thermal Bridging

Thermal Bridging calculations or psi-values detail the heat lost through the building’s walls, floors, roofs and windows. Producing bespoke psi-values can really pay dividends if you regularly build to the same specifications.

How can Energist help

Reducing heat loss through junction detailing can have a substantial impact on SAP and SBEM Calculations. Taking a bespoke approach, especially on developments with multiple plots, can be as cost-effective as changing your insulation or adding PV panels. This bespoke approach is achieved through Thermal Bridging calculations or psi-value analysis, which model the heat lost through junctions in the construction. Developers can use standardised psi-values but sometimes that’s not enough to reach compliance with Building Regulations.

Producing bespoke psi-values can really pay dividends if you regularly build to the same specifications. Once you have a set of Thermal Bridging Calculations, you can use them repeatedly on your next sites. It is also worth noting that certain constructions, such as steel frame systems, will require psi-value analysis as there are no approved details for them.

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Ellie Wang

Energy & Sustainability Specialist


Ellie Wang

Energy & Sustainability Specialist

Why choose Energist?

  • As well as the standard calculation sheets, we also produce a plain English report which summarises the results and clearly indicates performance.
  • For each junction assessed we will check both the thermal bridging heat losses and the surface condensation risks as standard.
  • Should any junctions fall short of the target, we will include recommendations on how the thermal performance of the junction could be improved.

Complete solutions from Energist

Bespoke Thermal Bridging can improve your SAP and SBEM results. Our assessors will join up the dots to ensure your Building Regulations submission is accurate.

  • Every new-build dwelling is required to meet compliance for energy efficiency with a SAP Calculation.
  • To prove a new non-domestic building is compliant with Part L Building Regulations, an SBEM Calculation must be completed.
  • If you are working to a bespoke construction, you may require a Condensation Risk Analysis to ensure condensation isn’t going to be a problem.