Thermal simulations are based on calculating Total System R-values (AS/NZ 4859.2) including the effects of thermal bridging (NZS 4214).
Where a wall, roof or floor system is modelled and has no structural thermal bridging, AS/NZS 4859.2 is adopted. For a wall, roof or floor system with structural thermal bridging to consider, AS/NZS 4859.2 and NZS 4214 are adopted. Where a wall has an exterior insulation product that has point thermal bridging, ISO 6946 is adopted.
Total R-value assessments are required by the National Construction Code. They are quickly simulated by calculating the thermal resistance of each layer within a roof to determine the Total Thermal Resistance or R-value. They also consider the ground substrate to provide a combined Total R-value using CIBSE Guide A.
To undertake Total R-value Assessment (Floor), select ‘Thermal’ in the results area and click ’Run 1 Calculation’. Once complete, results are presented numerically and set against the local building code minimum requirements.