This paper involves the findings of an in-situ monitoring project on the fabric performance of traditional wall assemblies in England. The SPAB, embarked on a programme of research to look at the in situ U-values of traditionally built walls. The range of walls examined was intentionally diverse in order to contrast with similar work undertaken on behalf of Historic Scotland where the walls under review were predominantly stone, and likewise research proposed by English Heritage where the intention was to gather data for brick buildings. In addition to the accumulation of in situ U-value figures for various traditional construction types a further exercise was undertaken, which compared the in situ U-value figures with figures calculated using a U-value calculating programme widely used within the construction industry, BuildDesk v3.4. The discrepancy between the figures produced by the two different U-value estimating methods was significant and provides evidence for claims that standard calculating methods underestimate the thermal performance of traditionally built buildings.


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