U value conventions in practice worked examples using br 443 this publication will assist designers who need a better understanding of how to calculate u values and kappa values for use in calculation tools. U value conventions in practice worked examples using br 443 bre building research establishment is an independent research based consultancy testing and training organisation operating in the built environment and associated industries. U value conventions in practice worked examples using br 443 fb 42 bre 2012 document status the calculation methods are explained using worked examples encompassing the main construction types in br 443 information is given about calculating u values using standard simplified methods. The calculation methods are explained using worked examples for wall roof and floor designs encompassing the main construction types in br 443 the examples can be used to support training programmes for practitioners carrying out energy assessments and using u value calculation software
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