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Correction: The Jan. 3 Spotlight covering UPC Section 309.4 incorrectly stated that all materials shall be "new." However, "new" is not part of the revised code language.

From the 2018 UPC Guide to Important Code Changes

What Changed.
402.4 Wall-Hung Fixtures. Wall-hung fixtures shall be rigidly supported by metal supporting members so that no strain is transmitted to the connections. Floor-affixed supports for off-the-floor plumbing fixtures for public use shall comply with ASME A112.6.1M. Framing-affixed supports for off-the-floor water closets with concealed tanks shall comply with ASME A112.6.2. Flush tanks and similar appurtenances shall be secured by approved non-corrosive screws or bolts.

Why It Changed.
This change creates a specific reference for standards currently in the code. By moving the requirements after the first sentence, it clarifies that the reference is to specific groups or products that are regulated by the two standards.

Additionally, the reference to the standard identifies the exact product that is being regulated. Hence, any floor affixed support for off the floor plumbing fixtures for public use would have to meet the standard. This does not require this type of attachment, as many sinks and lavatories are also attached by wall hangers. However, when a floor-affixed support is used, it must comply with the standard. The standard identifies the sizing and strength requirements for the supports. The same would be true for framing-affixed supports.

What It Means to Me.
Wall-hung water closet installation requirements are contained in Section 402.6 stating that they are to be connected to an approved carrier. This section refers to other fixtures that are wall mounted, such as lavatories, sinks or urinals. All must be supported by the proper mounting device, whether it is by mounting plates, brackets, or arms and not the drainage connection for framing-affixed supports with concealed tanks.

Engineers and designers will be required to ensure in their plans and specifications that all public use plumbing fixtures that incorporate floor-affixed supports for off-the-floor plumbing fixtures, that the supports comply with the new language

Plans examiners and inspectors shall verify the plans and specifications that the supports for public use off-the-floor plumbing fixtures meet the minimum required listings. Field inspectors should verify the supports installed on the job are the appropriate listed supports.

Plumbers, installers or technicians need the knowledge and experience to recognize the appropriate listed supports for public use off-the-floor plumbing fixtures are being installed where required.