What are psi values and why are they needed?
There are two types of thermal bridges which occur within buildings; repeating thermal bridges and non-repeating. Repeating thermal bridges should be taken into account when calculating the U-value of a construction. Non-repeating thermal bridges are dealt with differently and these occur at junctions between building elements and around windows and doors. iSBEM allows you to define psi values for such thermal bridges. The psi values is the linear thermal transmittance of a thermal bridge, in W/(mK). For each type of junction, you can enter a Psi value (W/mK) or tick the box indicating whether or not that type of junction complies with the relevant standard. The standard for junctions involving metal cladding are set by the Metal Cladding and Roofing Manufacturers Association (MCRMA) and the standards for junctions not involving metal cladding are Accredited Robust Details. The defaults for all the junctions in the building have been set to comply with the relevant MCRMA and Robust Det
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- What are psi values and why are they needed?
