About This Book
The 2021 International Residential Code (IRC) is a comprehensive regulatory framework encompassing all building, plumbing, mechanical, fuel gas, and electrical requirements applicable to one- and two-family dwellings and townhouses not exceeding three stories in height. This edition incorporates numerous significant updates, which are summarized as follows:
Braced wall lines must be positioned along a physical wall or distributed across multiple walls. The required fire-resistance rating for separations between two-family dwelling units is one hour, regardless of whether a lot line exists between the units. Emergency escape and rescue openings must provide an unobstructed 36-inch-wide path to a public way. Engineered design is now mandatory for storm shelters. Habitable attics are restricted to one-half the floor area of the story below, and the dwelling must be equipped with a sprinkler system. Updated wind speed maps have been aligned with those found in the IBC and ASCE 7 standards. Deck design requirements now account for snow load, tributary area for footings, post height, and guard details, with specific guardrail requirements also introduced. Component and cladding wind pressures in Table R301.2(2) have been revised to reflect updated design wind speeds and roof profiles, including both hip and gable configurations. Minimum footing size tables have been updated to more accurately represent current industry practice. Cripple wall requirements are now limited to exterior cripple walls. New appendices addressing cob construction and 3D-printed construction have been incorporated. A 30 percent reduction in airflow is permitted for balanced ventilation systems. Commercial gas cooking appliances are expressly prohibited. The required head pressure for water testing of drain, waste, and vent (DWV) systems has been increased to 10 feet. Air vacuum testing is now an approved method for plastic piping DWV systems. Section P2904, governing dwelling unit sprinkler systems, has been expanded to more closely align with NFPA 13D. An emergency service disconnect must be installed in a readily accessible outdoor location. Surge-protective devices (SPDs) are now required at the service panel. Finally, the number of receptacle outlets required for peninsular and island countertops in kitchens is now determined by the surface area of the countertop.
Practice Tests Using This Book
This book is required or recommended for 1 licensing exam. Our practice tests include questions based on this material.