This workbook provides an overview of critical concepts of the 2009 IECC for Colorado. Provides a basis for the correct use of the code in the design, plan review, inspection, and analysis of projects. Provides a clear understanding and correct use of the requirements identified by these basic code provisions, tables and categorizations allow code users to apply the code in clear-cut situations, and helps to build their understanding of the intent of the code when asked to make code compliance decisions.