PRESS RELEASE

IAPMO Standards Council Issues TIA UMC (003-24)

IAPMO Standards Council Issues TIA UMC (003-24)

Ontario, Calif. — The IAPMO Standards Council on Nov. 4 issued a tentative interim amendment (TIA) to the 2024 edition of the Uniform Mechanical Code (UMC®).

UMC TIA 003-24 revises UMC Chapter 11, Table 1102.3 (Refrigerant Groups, Properties, and Allowable Quantities), to update the permissible refrigerant quantities pertaining to refrigerant concentration limits (RCLs) and lower flammability limits (LFLs). 

The TIA was balloted through the Mechanical Technical Committee in accordance with the Regulations Governing Committee Projects to determine if there was the necessary three-fourths majority support, based on technical merit and emergency nature, to establish the recommendation for issuance. 

In determining whether to issue a TIA, the Standards Council looks to the Technical Committee letter ballot for a recommendation of support. Upon a full review and consideration of all the information available to it, the Council concluded that a clear and substantial basis exists to issue UMC TIA 003-24.

To examine this TIA in its entirety, please view: https://www.iapmo.org/media/n0edywdo/2024-umc-tia-003-issued.pdf

TIAs are proposals based on the determination of an emergency nature requiring prompt action to amend code that contains an error or omission that was overlooked during the regular code development process, contains a conflict within the document or with another IAPMO document, or to correct a hazard, promote an advancement in safeguarding the public or provide an opportunity to correct an adverse impact on a product or method of installation.

Austin, Texas, Adopts 2024 Uniform Codes

11 April 2025

The Austin, Texas, city council has formally adopted the 2024 editions of the Uniform Plumbing Code (UPC®) and Uniform Mechanical Code (UMC®) as the plumbing and mechanical codes of practice protecting the health and safety of the city’s nearly 1 million residents. The Texas state capital and 11th most populous city in the United States has utilized the Uniform Codes since 1974. 

Iowa Updates State Plumbing Code to 2024 UPC

08 April 2025

The Iowa Public Health Department has updated Chapter 25 of the Iowa Administrative Code, “State Plumbing Code,” from the 2021 Uniform Plumbing Code (UPC®) to the 2024 edition. The update went into effect on March 26. 

Scroll to top