R-value calculators for precast sandwich panels, single-layer panels and flooring are available through the National Precast Concrete Association website at nationalprecast.com.au.
Simply select the required concrete thickness, insulation, climate zone and building class, and the calculator will provide the total R-value of the wall or flooring system. A printable certificate shows the system results and can be used as evidence of compliance with the Building Code of Australia (2012) elemental Deemed-to-Satisfy requirements.
The sandwich panel calculator provides a mass-enhanced R-value for sandwich panel walls. It allows the high thermal mass of precast concrete to be recognized as an alternative solution to achieving BCA compliance.