This book familiarizes code users with the 2009 International Residential Code (IRC) as it applies to residential buildings. The book focuses on the essential ten chapters of the IRC that set forth the core provisions of the code necessary for use in building design and construction. It provides design and construction professionals- architects, engineers, and residential building contractors- an understanding of how the IRC was developed, and how it is likely to be interpreted when applied to the design and construction provisions for one-and two- family residential buildings and townhouses. This is an essential companion to the IRC for those seeking to master the accepted construction knowledge in the field, and for experienced practitioners needing to understand the newest code revisions and changes.