This comprehensive yet concise publication provides a convenient reference for regulations in chapters 12 through 43 of the 2003 International Residential Code (IRC ).The IRC addresses the design and installation of residential building systems through requirements that emphasize performance as well as bringing uniformity to construction of one- and two-family dwellings and townhouses up to three stories high. The IRC is the comprehensive code for homebuilding, it ties together all building, plumbing, mechanical, and electrical provisions for one- and two-family residences. It establishes minimum regulations using prescriptive provisions, and is founded on broad-based principles that make possible the use of new materials and building designs. The 2003 International Residential Code Commentary includes the full text of the Code, in addition to notes and explanations of the Code regulations and implications. This in-depth publication focuses on providing the full meaning and implications of the 2003 IRC and is designed to suggest the most effective method of application, as well as the consequences of not adhering to the code. This is an excellent reference for code officials, engineers, architects, inspectors, plans examiners, contractors and anyone who needs a better understanding of the 2003 IRC.