Thermal bridging by, for example, structural timber and mortar joints, is far too often neglected in U-value calculation. This is the case even with Building Regulations 'deemed to satisfy' constructions. Such bad practice is unnecessary because the CIBSE Guide Section A3 provides a method of calculation. This Note illustrates numerically the effects of thermal bridging in some typical building elements. The U-values are calculated by the CIBSE method allowing for thermal bridging, and compared with values calculated ignoring it.
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References
1.
CIBSE Guide Section A3 (London: Chartered Institution of Building Services Engineers) ( 1986)
2.
McIntyre D.A.The increase in U-value of a wall caused by mortar joints Memorandum 1843 (Capenhurst: Electricity Council Research Centre) (June 1984)
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Siviour J.B.Thermal performance of mineral fibre insulationBuilding Serv. Eng. Res. Technol.6(3) 91-133 (1985)
