International Code Council Reveals 2024 Plumbing Code and Mechanical Code

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

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The International Code Council recently published updated versions of the International Plumbing Code and the International Mechanical Code. These revisions aim to improve population health and better regulate sewer systems.

According to the press release:

The International Code Council has announced the publication of the 2024 International Plumbing Code (IPC) and the 2024 International Mechanical Code (IMC) from the upcoming 2024 editions of the International Codes (I-Codes). The IPC and IMC 2024 will be the first codes among the 2024 I-Codes to undergo significant formatting changes to improve the user experience and better align print and PDF versions of the I-Codes with the content of the Code Council's Digital Codes .

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 DWV (Drain Waste Vent) pipelines.
  • Showerhead flow is limited to 2 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.

Important changes from IMC 2021 to IMC 2024 include:

  • Requirements prohibiting the use of residential ductless 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.

As part of the Code Council's digital transformation strategy, IPC and IMC 2024 are the first I-Codes to incorporate new and improved formatting to align with the content of the Code Council's digital codes contained in the I-Codes 2024 and all future ones Codes are implemented using I-Codes. These improvements were developed and implemented based on feedback from users of print and digital I-Codes and aim to improve the user experience through a modern look and feel that improves readability.

Notable improvements to the latest codes include additions such as QR codes alongside the revised codes for easier referencing, as well as a pilot program of a Near Field Communication (NFC) tag to improve user access to the I-Codes support, increasing security and to improve the registration process for product owners.

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