In 2001 more stringent residential code requirements went into effect with the adoption of International Residential Code (IRC) as the statewide residential building energy code. The IRC also incorporates the entire International Energy Conservation Code (IECC) as an alternative energy code for homes with glazing areas of 15% and below. Under this scenario there are multiple compliance paths including a whole building approach and a performance method that could allow a builder to trade-off building features. The information in the Code Requirements section of this Web site is designed to help clarify the requirements of the IRC and the IECC alternative in Texas.
The National Fenestration Rating Council (NFRC) is an international coalition that administers testing, certification and labeling of windows, skylights and doors. NFRC sets energy test standards and administers ratings by independent labs. The NFRC energy performance label helps builders, retailers and consumers reliably compare one product to another by providing detailed performance measures. Of particular importance to code officials and the energy conscious alike are U-factor and Solar Heat Gain Coefficient (SHGC).
For more information on the NFRC, its Label, and its certified product directory and database, go to NFRC Labeling Systems
Additional support information regarding specific prescriptive window requirements, broader building envelope requirements, and general energy code requirements are available at the Efficient Windows Collaborative and the Building Energy Codes Program web sites.