October 10, 2024
From the 2024 UPC Illustrated Training Manual, Chapter 8 – INDIRECT WASTES
804.1 Standpipe Receptors. Plumbing fixtures or other receptors receiving the discharge of indirect waste pipes shall be approved for the use proposed and shall be of such shape and capacity as to prevent splashing or flooding and shall be located where they are readily accessible for inspection and cleaning. No standpipe receptor for a clothes washer shall extend more than 30 inches (762 mm), or not less than 18 inches (457 mm) above its trap weir. No trap for a clothes washer standpipe receptor shall be installed below the floor, but shall be roughed in not less than 6 inches (152 mm) and not more than 18 inches (457 mm) above the floor. No indirect waste receptor shall be installed in a toilet room, closet, cupboard, or storeroom, or in a portion of a building not in general use by the occupants thereof; except standpipes for clothes washers shall be permitted to be installed in toilet and bathroom areas where the clothes washer is installed in the same room.
One of the primary duties of the design professional and the plumber concerning indirect waste is to ensure that the receptor is large enough in physical dimensions and in pipe size to accept the waste flowing into it. The receptor must be deep and wide enough so that there will be no overloading or splashing on the floor that could cause a slip hazard. The size of the receptor should be determined using the parameters set forth in Section 702.0, Fixture Unit Equivalents, Table 702.1 and Table 702.2.
The clothes washer standpipe is considered an indirect waste receptor, not a fixture tailpiece, and, as such, has specific requirements for its use. Noting that the average height of a typical clothes washer is 38 to 43 inches, the intent of this code section is to utilize a combination of these options that will have the clothes washer standpipe terminating at an accessible location (see Figures 804.1a and 804.1b).
CLOTHES WASHER STANDPIPE ELEVATIONS
CLOTHES WASHER STANDPIPE INSTALLATION
From the 2024 UMC Illustrated Training Manual, Chapter 3 – GENERAL REGULATIONS
304.3.1.1 Access Type. The inside means of access shall be a permanent or foldaway inside stairway or ladder, terminating in an enclosure, scuttle, or trapdoor. Such scuttles or trapdoors shall be at least 22 inches by 24 inches (559 mm by 610 mm) in size, shall open easily and safely under all conditions, especially snow, and shall be constructed so as to permit access from the roof side unless deliberately locked on the inside.
At least 6 feet (1829 mm) of clearance shall be available between the access opening and the edge of the roof or similar hazard, or rigidly fixed rails or guards a minimum of 42 inches (1067 mm) in height shall be provided on the exposed side. Where parapets or other building structures are utilized in lieu of guards or rails, they shall be a minimum of 42 inches (1067 mm) in height. [NFPA 54:9.4.3.3]
The section requires a permanent ladder or a foldaway stairway or ladder as an interior access to the roof (see Figure 304.3.1.1a). Please note that the scuttle or trap door dimensions (see Figure 304.3.1.1b) are different from those for attic access. It is required to be 22 inches by 24 inches while attic access is required to be 22 inches by 30 inches (see Section 304.4).
(This is not to be considered the official position of IAPMO, nor is it an official interpretation of the Codes.)
IAPMO
IAPMO develops and publishes the Uniform Plumbing Code®,the most widely recognized code of practice used by the plumbing industry worldwide; Uniform Mechanical Code®; Uniform Swimming Pool, Spa and Hot Tub Code®; and Uniform Solar Energy, Hydronics and Geothermal Code™ — the only plumbing, mechanical, solar energy and swimming pool codes designated by ANSI as American National Standards — and the Water Efficiency Standard (WE-Stand)™. IAPMO works with government, contractors, labor force, and manufacturers to produce product standards, technical manuals, personnel certification/educational programs and additional resources in order to meet the ever-evolving demands of the industry in protecting public health and safety.
Last modified: October 10, 2024