SR361 The selection and hygro-thermal modelling of new New Zealand dwellings (pilot) (December 2019)

This pilot study provides a proof of concept for effectively and robustly selecting and examining a variety of recently consented dwellings reflective of new New Zealand housing. The project is driven by the recognition that three associated clauses of the New Zealand Building Code (NZBC) – H1 Energy efficiency, E3 Internal moisture and G4 Ventilation – have not been updated for some time and, consequently, may not be providing an optimum internal environment.

A simple, iterative housing typology selection process is detailed, which results in dividing dwellings into six main types: detached single storey, detached double storey, attached single storey, townhouses, mid-rise apartments and retirement villages. These types may be refined as knowledge about their differing hygro-thermal behaviours becomes apparent in the next project stage. The hygro-thermal simulation developed in this pilot combines several computer modelling tools (SketchUp, EnergyPlus and WUFI), resulting in a far more comprehensive insight into how dwellings perform hygro-thermally than has been available previously. This methodology is also described in some detail.