Thermal bridging is an area of a building which has a significantly higher heat transfer due to either a break in insulation or reduced insulation. This would be around openings or where two elements meet i.e. floor to wall, wall to roof etc. When completing a SAP calculation we need to account for thermal bridging due to the heat loss and therefore reduced energy performance of the dwelling. The heat loss associated with these thermal bridges is expressed as a linear thermal transmittance (Ψ-value) – pronounced as ‘psi-value’ Below you can see the thermal bridges that need to be accounted for

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The Standard Assessment Procedure (SAP) is the methodology used by the Government to assess and compare the energy and environmental performance of dwellings. Its purpose is to provide accurate and reliable assessments of dwelling energy performances that are needed to underpin energy and environmental policy initiatives.

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Conversion

SAP stands for the Standard Assessment Procedure which the UK Government has adopted as the methodology for calculating energy performance in dwellings. This was introduced into the Building Regulations in 1995 as a vital step in the process of improving the energy performance and reducing the CO2 emissions.

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