ICC unveils 2024 International Plumbing Code and Mechanical Code

The International Code Council, the leading global source for model codes and standards and building security solutions referenced worldwide, has announced the publication of the 2024 International Plumbing Code (IPC) and the 2024 International Mechanical Code (IMC) from the upcoming 2024 editions International codes (I codes).

The Council says that IPC and IMC 2024 will be the first codes among the I-Codes 2024 to undergo significant formatting changes to improve the user experience and make print and PDF versions of the I-Codes more closely match the content of the digital codes of the Code Council to adapt.

The IPC 2024 improves public health through improved waste management requirements and the resilience of the sanitation system to natural hazards.

Additionally, it promotes community sustainability through new water conservation measures while ensuring building accessibility by incorporating the updated ICC A117.1 accessibility standard, making the IPC the most comprehensive plumbing code available.

Updates to IPC 2024 include:

  • Provisions have been added to support buried piping beneath buildings where expansive soil conditions exist.
  • Added option for vacuum testing of Drain Waste Vent (DWV) pipelines.
  • Showerhead flow is limited to 2.0 gallons per minute (gpm), with performance meeting high efficiency requirements.
  • Standards for chemical waste piping and connection materials have been added.

The IMC 2024 establishes minimum requirements for mechanical systems using prescriptive and performance provisions.

Key changes from IMC 2021 include:

  • Requirements prohibiting the use of ductless household range hoods in Groups I-1 and I-2 have been removed.
  • Group A2L and B2L refrigerant requirements have been added.
  • Added leak detection monitoring with alarm requirements where the outlet of safety valves is not “readily visible” to residents.
  • The need for outside air for residential units has increased.
  • Added requirements for the exhaust system common ducts serving separate dwelling units that require the common duct or duct to be maintained under negative pressure at all times.

The IPC and IMC 2024 are the first I-Codes to include new formatting aligned with the content of the Code Council's Digital Codes. These will be implemented in I-Codes 2024 and all future I-Codes with the aim of improving the user experience with a modern look that improves readability.



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