Types of thermal bridge

There are essentially three types of thermal bridge:

• Repeating thermal bridges

• Linear thermal bridges: The Y-value (psi-value)

• Nodal thermal bridges: The X-value (chi-value)

Linear and nodal thermal bridges are determined in accordance with BS EN ISO 10211. Linear thermal bridges occur at the junctions between two building elements. Nodal thermal bridges arise when three building elements intersect (eg, a corner between two walls and a floor) or where a single element (eg, a steel beam) penetrates the insulation.

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