TBD takes OSM constructions and materials (often building-level defaults) and generates surface-specific constructions and materials - once thermally derated. In many circumstances, it would be preferable to have TBD adjust a single default construction set, based on known thermal bridges and their derating effect, in order to achieve a predefined target (e.g. an area-weighted average of R20 for all walls). This would be useful for codes and standards that require a compliance check with respect to a single, derated target (e.g. R27 for walls in Canadian NECB Climate Zone 7). It is somewhat more practical for building professionals as well, e.g. "OK. Given my project's geometry and thermal bridges, what should be the clear-field effective R-value of my project's default wall composition so I can achieve - overall - a R20 derated value".
TBD takes OSM constructions and materials (often building-level defaults) and generates surface-specific constructions and materials - once thermally derated. In many circumstances, it would be preferable to have TBD adjust a single default construction set, based on known thermal bridges and their derating effect, in order to achieve a predefined target (e.g. an area-weighted average of R20 for all walls). This would be useful for codes and standards that require a compliance check with respect to a single, derated target (e.g. R27 for walls in Canadian NECB Climate Zone 7). It is somewhat more practical for building professionals as well, e.g. "OK. Given my project's geometry and thermal bridges, what should be the clear-field effective R-value of my project's default wall composition so I can achieve - overall - a R20 derated value".