The Simplified Performance Tradeoff Approach has been modified for the 2013 Standards. A simplified tradeoff in the performance approach replaces the prescriptive, spreadsheet-based tradeoff in the 2008 Standards. With the new approach called, “Simplified Performance Tradeoff Approach”, the user can tradeoff the energy efficiency benefits between roof reflectance and roof insulation through a simplified approach that only requires a limited set of inputs. This compliance approach allows the user to enter inputs such as building type, building vintage, roof insulation and roof reflectance details and compliance software analyzes the energy effects of design choices without the need for elaborate lookup tables and other detailed information. The procedure can be accessed on the Energy Commission’s web site at www.energy.ca.gov2013standards.
The previously used Overall Envelope TDV approach is no longer available for compliance use with new construction. In its place, simplified tradeoffs have been incorporated into the prescriptive standards for new construction (§140.3) and alterations (§141.0) in tabulated form.