<p>This code applies to all buildings except detached one- and two-family dwellings and townhouses up to three stories. The 2021 IBC® contains many important changes such as:</p><ul><li>Puzzle rooms (escape rooms) are now defined and regulated as special amusement areas, requiring compliance with Section 411 and special means of egress requirements.</li><li>For the purposes of determining the allowable number of control areas in a building, each portion separated by one or more fire walls is now considered as a separate building.</li><li>In Group E occupancies, enhanced classroom acoustics in compliance with ICC A117.1 are to be provided in all classrooms having of volume of 20,000 cubic feet or less.</li><li>The requirements for metal composite materials and systems (MCM) installed on the exterior walls of Types I, II, III and IV construction were simplified and sprinkler allowances were deleted</li><li>The use of intermodal shipping containers as buildings is now specifically addressed through provisions intended to supplement existing applicable IBC requirements.</li><li>Automatic sprinkler protection is now required in Group S-2 open parking garages where any fire area exceeds 48,000 square feet.</li><li>The 2017 edition of ICC A117.1 was adopted.</li><li>Parapets of a minimum height are now required for aggregate-surfaced roofs to prevent blow-off.</li><li>Mixed occupancy buildings with assembly spaces are placed in Risk Category III when the total public assembly occupant load is greater than 2500 people.</li><li>The 2021 IBC snow map is updated to match ASCE 7-16 snow maps by adding a reference to ASCE 7 snow tables in states with large case study areas.</li><li>Secondary rain loads are updated to be consistent with ASCE 7.</li><li>Special inspection requirements were added to address the anchorage and connection of mass timber structural elements.</li><li>Installation of firestop, fire-resistant joint systems and perimeter fire barrier systems in residential-use buildings now requires special inspection in Group R fire areas having an occupant load exceeding 250 people.</li><li>Frost protection for egress doors was added to the foundation requirements.</li><li>ACI standards ACI 117 and ITG 7 were added by reference to provide acceptable tolerances for concrete construction.</li><li>Three new types of construction (Types IV-A, IV-B, and IV-C) allow mass timber buildings of taller heights, more stories above grade, and greater allowable areas compared to existing provisions for heavy timber buildings.</li></ul>

2021 International Building Code® • Redline PDF

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