This publication provides authoritative estimates of the R-value of common building construction elements incorporating timber framed construction. These may be required to satisfy minimum thermal performance design standards introduced by State and Local government building regulatory authorities throughout Australia. The R-values have been calculated using two computer programs Rvalues.for (Walls & Roof/Ceilings) and FlorsU.for (Floors). These programs include an iterative calculation of the thermal resistance of all components, including air gaps and spaces, to produce accurate values for the assumed external and internal temperature conditions. The various assumptions inherent in the calculations are explained in this publication. It should be noted that any variation to these variables may result in a different R-value for the element.

• thermal analysis and performance
• wood frame houses and walls, wood structure

1. Multi-criteria assessment of building performance: theory and implementation