Measuring and controlling the weakest links through Thermal Bridging Analysis.

It is often stated that any process, system or project is only as strong as its weakest link. In buildings, it is the junctions, where different materials are connected, that are prone to heat loss and reduce the efficiency of the property. The heat loss associated with thermal bridges is called linear thermal transmittance or PSI value (pronounced “si”).

Two types of thermal bridges
  • A repeating thermal bridge, such as the studs in a timber or steel frame wall. The heat loss through these junctions are accounted for through conventional U-value calculations.
  • A non-repeating thermal bridges, for example a lintel above a window, the cill and jambs around openings.

The non repeating thermal bridging junctions ( PSI values) are individually measured through SAP and the heat loss through these junctions can be calculated either by adopting accredited details values or if the junctions are non standard by calculating them individually.

Calculating the actual heat loss through junction details can offer large savings in SAP calculations and can make the route to building regulation compliance much easier.

The benefits of modelling PSI and the related FRSI values can also highlight to the design team potential issues with a risk of condensation.

Abbey Consultants are able to calculate the heat loss through the junctions using approved modelling software.

Get in touch or send an email with an outline of your Thermal Bridging Analysis enquiry and one of the team will respond within 24 hours.

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