SPS 382.31(16)(d)1.c.c. At least 10 feet horizontally from or 2 feet above roof scuttles, doors, and openable windows. SPS 382.31(16)(d)2.2. Where a structure has an earth covered roof extending from surrounding grade, the vent extension shall run at least 7 feet above grade and terminate with an approved vent cap. The portion of vent pipe outside the structure shall be without joints, except one fitting may be installed where the pipe leaves the top or side of the structure. SPS 382.31(16)(e)(e) Extension through wall. A vent shall terminate at least 10 feet horizontally from any lot line. Extension of vents through wall shall terminate beyond the soffit. The vent shall terminate downward and be screened. The vent shall comply with par. (d). SPS 382.31(16)(f)(f) Extensions outside buildings. Drain or vent pipe extensions shall not be located or placed on the outside of an exterior wall of any new building, but shall be located inside the building. SPS 382.31(16)(g)(g) Frost closure. For protection against frost closure, each vent terminal shall be at least 2” in diameter. Where it is necessary to increase the diameter of the vent, the change in diameter shall be made at least 6” inside the building. SPS 382.31(16)(h)(h) Penetrations through grade. Except when installation is in accordance with par. (d) 2., penetrations through grade shall terminate at least 12” above finished grade and terminate with a vent cap or return bend. SPS 382.31(17)(17) Combination drain and vent systems. In lieu of providing individual vents, fixtures may be vented in accordance with pars. (a) to (d). SPS 382.31(17)(a)1.1. A drain stack may serve as a combination drain and vent system for fixtures in accordance with subd. 1. a. to e. SPS 382.31(17)(a)1.a.a. The drain stack shall not serve more than 3 fixtures. Each fixture shall be located on a separate floor level. SPS 382.31(17)(a)1.b.b. The drain stack shall be limited to serving fixtures with a drainage fixture unit value of no greater than 2.0. A urinal may not discharge into the combination drain and vent portion of the stack. The largest drainage fixture unit value served by the stack shall determine the stack size as specified in Table 382.31-5. SPS 382.31(17)(a)1.c.c. The drain stack shall not be offset horizontally above the lowest fixture drain connection. SPS 382.31(17)(a)1.d.d. The developed length of any fixture drain from the trap weir to the drain stack shall not exceed the limits specified in Table 382.31-1. SPS 382.31(17)(a)1.e.e. The drain stack and its attendant vent shall be sized in accordance with Table 382.31-5. SPS 382.31(17)(a)2.2. A drain stack may serve as a combination drain and vent system for a kitchen sink and a wall outlet fixture with a drainage fixture unit value of 2 or less in accordance with subd. 2. a. to d. SPS 382.31(17)(a)2.a.a. One kitchen sink within a dwelling unit, with or without a food waste grinder or dishwasher connection, shall connect to the drain stack above the wall outlet fixture with a drainage fixture unit value of 2 or less. No other fixtures may connect to the drain stack. SPS 382.31(17)(a)2.b.b. The drain stack shall be at least 2 inches in diameter below the kitchen sink connection and it shall be at least 4 inches in diameter below the connection to the lower fixture. SPS 382.31(17)(a)2.c.c. In lieu of the minimum sizes as required in subd. 2. b., the entire stack below the kitchen sink connection may be 3 inches in diameter. SPS 382.31(17)(a)2.d.d. The drain stack shall not offset horizontally above the fixture drain connection for the lower fixture. SPS 382.31(17)(b)(b) Building drains. A building drain or a building subdrain may serve as a combination drain and vent system for floor drains and floor outlet fixtures in accordance with subds. 1. to 6. SPS 382.31(17)(b)1.1. A vent or drain at least 2 inches in diameter shall be connected upstream of any building drain branch or building subdrain branch. SPS 382.31(17)(b)2.2. No more than 2 water closets may connect to the building drain or building subdrain by means of building drain branches or building subdrain branches. SPS 382.31(17)(b)3.a.a. That portion of the building drain or building subdrain between the connection of the building drain branch or building subdrain branch and the vent or drain required in subd. 1. shall be at least one pipe size larger than the minimum size permitted in Table 382.30–3 based on the total drainage fixture unit load, but not less than 3 inches. SPS 382.31(17)(b)3.b.b. The vent or drain required in subd. 1. shall be at least one-half the diameter of that portion of the building drain or building subdrain which is vented by the vent or drain, but may not be less than 2 inches in diameter. SPS 382.31(17)(b)3.c.c. A vent serving a drain required in subd. 1., shall be at least one half the diameter of that portion of the building drain or building subdrain which is vented by the system, but may not be less than 2 inches in diameter. SPS 382.31(17)(b)4.4. The trap of a floor drain or a floor outlet fixture, except a water closet, connected to a building drain branch or building subdrain branch shall be at least 3” in diameter. SPS 382.31(17)(b)5.5. A building drain branch or building subdrain branch may not connect to a building drain or building subdrain downstream from the base fitting of a drain stack 2” or larger in diameter within the distance equal to 20 pipe diameters of the building drain or building subdrain. SPS 382.31(17)(b)6.6. The pitch and the developed length of the building drain branch or building subdrain branch may not exceed the limits specified in Table 382.31-1. SPS 382.31(17)(c)(c) Laboratory sink venting. A horizontal drain may serve as a combination drain and vent system for island laboratory sinks in accordance with subds. 1. to 7. SPS 382.31(17)(c)1.1. A vent stack or a drain stack at least 2” in diameter shall be connected upstream of any fixture drain vented by the combination drain and vent system. SPS 382.31(17)(c)2.a.a. That portion of the horizontal drain between the connection of fixture drain and the vent stack or drain stack required in subd. 1. shall be at least one pipe size larger than the minimum size permitted in Table 382.30-2 based on total drainage fixture unit load. SPS 382.31(17)(c)2.b.b. The vent stack or drain stack required in subd. 1. shall be at least one-half the diameter of that portion of the horizontal drain which is vented by the stack, but may not be less than 2″ in diameter. SPS 382.31(17)(c)2.c.c. A stack vent serving a drain stack required in subd. 1. shall be at least one half the diameter of that portion of the horizontal drain which is vented by the stack, but may not be less than 2” in diameter. SPS 382.31(17)(c)3.3. All fixture drains vented by the horizontal drain shall be at least 3” in diameter. SPS 382.31(17)(c)4.4. Fixture drains to be vented by the horizontal drain shall connect individually to the horizontal drain. SPS 382.31(17)(c)5.5. An individual vent or common vent shall be extended as high as possible under the sink enclosure and then returned vertically downward and connected to the horizontal drain. A cleanout shall be provided on the vent piping. SPS 382.31(17)(c)6.6. In lieu of connecting the vent to the horizontal drain which forms the combination drain and vent system, the vent may connect to a horizontal fixture drain vented by the combination drain and vent system. The pitch and developed length of the horizontal fixture drain shall not exceed the limits specified in Table 382.31-1. SPS 382.31(17)(c)7.7. Fixture drains to be vented by the horizontal drain shall not connect to a horizontal drain downstream from the base fitting of a drain stack 2” or larger in diameter within the distance equal to 20 pipe diameters of the horizontal drain serving the stack. SPS 382.31(17)(d)3.3. The drain stack may not offset horizontally above the lowest threshold drain connection. SPS 382.31(17)(d)4.4. Elevator threshold drains, provided with individual traps that utilize other means of venting, are permitted to discharge into the stack. SPS 382.31(17)(d)5.5. The drain stack shall be limited to serving elevators threshold drains serving elevator door areas. SPS 382.31(17)(d)6.6. The developed length of any trap weir vented by the stack to the drain stack may not exceed the limits specified in Table 382.31-1. SPS 382.31(17)(d)7.7. A vent, at least 3 inches in diameter and not less than ½ the diameter of the largest portion of the drain stack, shall extend from immediately above the highest branch connection to a vent terminal in accordance with sub. (16). SPS 382.31(17m)(17m) Air admittance valves. The use of air admittance valves in lieu of traditional venting shall comply with all of the following: SPS 382.31(17m)(a)(a) The AAV may only serve as a termination point for a branch vent, circuit vent, common vent, individual vent, wet vent or combination drain and vent system. The AAV may serve a pumped-discharge type clothes washer standpipe when the fixture drain downstream of the point of vent is at least 3 inches in diameter. SPS 382.31(17m)(b)(b) Branches that have fixtures served by the AAV, and when connected to a stack that has 4 or more branch intervals above the branch connection, must be provided with a relief vent located between the most downstream fixture and the stack. SPS 382.31(17m)(c)(c) The AAV may not serve as a vent termination point for any of the following: SPS 382.31(17m)(c)1.1. Areas of negative pressure such as parking garages, laboratories, and research facilities. SPS 382.31(17m)(c)12.12. Plumbing wastewater and treatment devices used to treat fats, oils & grease (FOG). SPS 382.31(17m)(c)13.13. An area that subjects the valve to grease or other materials which could cause fouling of the valve’s seal. SPS 382.31(17m)(c)14.14. Clean rooms such as FDA or DATCP regulated food and beverage production areas, bio safety labs, pharmaceutical production, and pharmaceutical processing facilities. SPS 382.31 NoteNote: For specific applications not listed, please contact DSPS Division of Industry Services at P.O. Box 7162, Madison, WI 53707-7162; or at telephone (608) 266-2112 or (877) 617-1565 or 711 (Telecommunications Relay); or at the Division’s Website at http://dsps.wi.gov/programs/industry-services. SPS 382.31 NoteNote: Does not include closets or bathrooms with solid doors in accordance with Standard International Building Code s. 508.2.3.
SPS 382.31(17m)(d)(d) The size and developed length for a vent using an AAV shall conform with Table 382.31-6. a Drainage Fixture Units based on ch. SPS 382. b NL means no limit.
c NP means not permitted.
d Not more than two water closets or similar type fixtures of four or more drainage fixture units.
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Department of Safety and Professional Services (SPS)
Chs. SPS 301-399 ; Safety, Buildings, and Environment
administrativecode/SPS 382.31(17)(b)2.
administrativecode/SPS 382.31(17)(b)2.
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