can i use an air admittance valve for toilet

#CAN I USE AN AIR ADMITTANCE VALVE FOR TOILET UPDATE#
#CAN I USE AN AIR ADMITTANCE VALVE FOR TOILET CODE#

This rule making was adopted by the Board on April 20, 2021. The Board is not making any changes in response to the comments. Potential cost savings for contractors are not a compelling reason to continue utilizing single-stack systems if the cost savings come at the expense of compliance with the UPC's other provisions and overall intent. The Board's proposed rule provides a uniform, easy-to-apply, bright-line rule that does not allow alternative engineered designs to become a loophole circumventing Section 310.4.Īdditionally, the Board has found that single-stack systems in Iowa often do not maintain the one-inch water column required under Section 901.3 of the UPC.

Section 310.4 of the UPC, which the Board is also adopting, already prohibits single-stack drainage and venting systems with unvented branch lines. Section 301.5 of the UPC requires alternative engineered designs to comply with the intent of the overall UPC. The Board has not changed its position on these systems and reiterates its response from 2018:

#CAN I USE AN AIR ADMITTANCE VALVE FOR TOILET CODE#

Single-stack drainage systems were not included as part of the 2021 state plumbing code changes and were not considered during the many months of work on the 2021 state plumbing code updates.

#CAN I USE AN AIR ADMITTANCE VALVE FOR TOILET UPDATE#

The Board made changes to eliminate the use of such systems during its last update to the state plumbing code in 2018. Two comments were received regarding the use of single-stack drainage systems.

Specifically, they involve the use of mechanical parts, which can fail. The 2021 UPC does not allow air admittance valves because they have a tendency to disrupt the basic principles of venting, which can lead to venting system failure. However, in response to the comment, the Board disagreed with the commenter and did not believe air admittance valves should be allowed. Air admittance valves were not included as part of the 2021 state plumbing code changes and were not considered during the many months of work on the 2021 state plumbing code updates. One commenter suggested that air admittance valves should be allowed to be used. One commenter requested a change, but the Board disagreed with the commenter. Two commenters took issue with the state plumbing code changes the Board made in the last code cycle (2018). Five commenters from various trade organizations offered letters of support. There were eight comments for Chapter 25. Notice of Intended Action for this rule making was published in the Iowa Administrative Bulletin on February 24, 2021, as ARC 5478C. Public Comment and Changes to Rule Making Notable changes in the most recent version include a new Appendix N titled 'Impact of Water Temperature on the Potential for Scalding and Legionella Growth,' new provisions for backflow prevention devices, new provisions for temperature-limiting devices, new guards and rails requirements for installation of equipment and appliances on roofs, new requirements for the discharge of temperature and pressure relief valve piping, a new provision on leak detection devices, new provisions for potable water pumps, new standards for drain waste and vent pipe and fittings, new provisions for drain waste and vent cleanouts, updated and expanded circuit vent provisions, updated fuel gas provisions, and updated medical gas provisions. The Board is required by law to adopt the most recent version of the UPC.

The Board previously adopted the 2018 edition of the UPC. These amendments include the adoption by reference of the Uniform Plumbing Code (UPC), 2021 Edition. This rule making implements, in whole or in part, Iowa Code section 105.4. This rule making is adopted under the authority provided in Iowa Code section 105.4. The Plumbing and Mechanical Systems Board hereby amends Chapter 25, 'State Plumbing Code,' Iowa Administrative Code. Rule making related to the state plumbing code

Can i use an air admittance valve for toilet