Model design
5.1 The TER is based on a building of the same size and shape as the actual building, constructed to a concurrent specification. If the actual building is constructed entirely to this specification it will meet the TER and therefore pass Criterion 1. Table 5 provides a summary of the concurrent notional building specifications for each category of building. More detailed information can be found in the NCM modelling guide.
5.2 It should be noted, however, that the concurrent notional building specifications are not prescriptive and may not be the most economic specification in every case. Designers are free to explore the most economic specification to meet the TER in each case, provided that this specification meets all other provisions within this approved document, in particular the limiting fabric parameters in Table 3.
5.3 Some builders may prefer to adopt model design packages rather than to engage in design for themselves. Such model packages of fabric U-values, boiler seasonal efficiencies, window opening allowances etc. should, if suitably robust, help the builder achieve compliance. The construction industry may develop model designs for this purpose and make them available on the Internet at: http://www.modeldesigns.info
5.4 It will still be necessary to demonstrate compliance in the particular case by going through the procedures described in paragraphs 2.7 to 2.15.
Table 5 Summary of concurrent notional building specification
