SPS 382.31(11)(11) Common vents. In lieu of providing individual vents, fixtures may be common vented in accordance with pars. (a) and (b). SPS 382.31(11)(a)(a) Vertical drains. A common vent may serve a maximum of 2 fixtures where both fixture drains connect to a vertical drain at the same elevation. SPS 382.31(11)(a)1.1. Where this connection is by means of a sanitary tee fitting with a side inlet, the centerline of the side inlet opening may not be below the centerline of the larger opening. SPS 382.31(11)(a)2.2. The drain connection of a blowout type fixture, kitchen sink where an appliance with pump discharge or a food waste grinder are installed, or a clothes washer served by a common vent may not be by means of a double sanitary tee fitting. SPS 382.31(11)(b)(b) Horizontal branches. The fixture drains from 2 wall-outlet fixtures, each with a drainage fixture unit value of one or less, or the fixture drains from 2 traps serving a kitchen sink with or without a dishwasher may connect to a horizontal branch without individual vents provided a common vent connects to the branch drain downstream of both fixture drains. Both fixture drains shall be of the same diameter. The developed length of the drain from the vent to the farthest trap shall conform to sub. (9). SPS 382.31(12)(12) Return vents. Plumbing fixtures may be vented in accordance with pars. (a) to (d). SPS 382.31(12)(a)(a) Wall outlet fixtures may be vented by extending an individual vent, vertical wet vent or a common vent as high as possible under the fixture enclosure and returning the vent vertically downward and connecting the vent to the fixture drain or branch drain by means of a wye pattern fitting. SPS 382.31(12)(b)(b) Horizontal vent piping shall connect to the vertical section of the fixture vent and extend to a point where it can extend vertically to a vent terminal in accordance with sub. (16) or connect to another vent in accordance with sub. (15). SPS 382.31(12)(c)(c) Drainage fittings shall be used on all sections of the vent pipe below the floor level and a minimum slope of 1⁄4” per foot to the drainage point shall be provided. SPS 382.31(13)(13) Wet venting. In lieu of providing individual vents, fixtures may be wet vented in accordance with pars. (a) to (c). SPS 382.31(13)(a)1.1. Where 2 wall outlet fixtures are located on the same floor level with their fixture drains connecting to the same vertical drain pipe at different elevations, the lower fixture drain may be wet vented in accordance with subd. 1. a. to e. SPS 382.31(13)(a)1.a.a. No other fixtures may discharge into the vertical drain pipe above or between the 2 wall outlet fixtures. Additional fixtures may discharge into the vertical drain pipe below the 2 wall outlet fixtures. SPS 382.31(13)(a)1.b.b. A branch vent shall connect to the vertical drain pipe immediately above the higher fixture drain connection. SPS 382.31(13)(a)1.c.c. The drain between the 2 fixtures shall be at least one pipe size larger than the upper fixture drain, but not smaller than 2” in diameter. SPS 382.31(13)(a)1.d.d. Both fixture drains shall conform to sub. (9). The connection of the lower fixture drain to the vertical drain shall be considered as the vent connection. SPS 382.31(13)(b)(b) Horizontal wet vents. A drain from a lavatory or lavatories which are either provided with individual vents or a common vent may serve as the wet vent for not more than 2 bathtubs or showers and not more than 2 water closets in accordance with subds. 1. to 7. No other fixtures may discharge into or be served by the wet vent. SPS 382.31(13)(b)2.2. The lavatories and bathtubs or showers shall have a common horizontal drain with the drain for the lavatories serving as a wet vent for the bathtubs or showers. SPS 382.31(13)(b)3.3. Where 2 bathtubs or showers are served by the same wet vent, their fixture drains shall connect independently to the common horizontal drain downstream of the vertical drain serving the lavatory or lavatories. SPS 382.31(13)(b)4.4. Where 2 bathtubs or showers and 2 water closets are served by the same wet vent a relief vent shall be provided, unless the wet vented horizontal drain connects to a drain stack with no other drain connections located above the wet-vented horizontal drain. The relief vent shall connect to the horizontal drain at a point downstream of the fixture drains for the water closets and upstream of any other fixture drain connections. SPS 382.31(13)(b)5.5. One or 2 water closets may connect to the common horizontal drain with the drain from the lavatories and bathtubs or showers also serving as a wet vent for the water closets. Where 2 water closets are served by the same wet vent, their fixture drains shall connect independently to the common horizontal drain at the same point. SPS 382.31(13)(b)6.6. The wet vent shall be at least 2” in diameter. No more than 4 drainage fixture units may discharge into a 2” diameter wet vent. SPS 382.31(13)(b)7.7. A branch vent shall connect immediately above the highest fixture drain connection and shall be sized in accordance with sub. (14). SPS 382.31(13)(c)(c) Other types of wet vents. An individual vent serving a floor outlet fixture, a common vent serving floor outlet fixtures, a circuit vent, a relief vent serving a circuit vented drain or a relief vent serving a wet vented horizontal drain may serve as a wet vent in accordance with subds. 1. to 4. SPS 382.31(13)(c)1.1. No more than 2 wall outlet fixtures, each fixture with a drainage fixture unit value of one or less, may have their fixture drains connected into the individual vent, common vent, circuit vent or relief vent. SPS 382.31(13)(c)3.3. The branch vent to which the wet vent connects shall be sized in accordance with sub. (14). The branch vent may serve the wall outlet fixtures in lieu of individual vents or a common vent. SPS 382.31(13)(c)4.4. The fixtures discharging into the wet vent shall be located on the same floor level as the fixtures served by the wet vent. SPS 382.31 NoteNote: For explanatory material refer to ch. SPS 382 Appendix A-382.31 (13). SPS 382.31(14)(a)(a) Stack vents and vent stacks. Stack vent and vent stack pipe sizes shall be determined in accordance with Table 382.31-2 on the basis of developed length and the diameter of the drain stack at its base. SPS 382.31(14)(a)1.1. The developed length of the stack vent shall be measured along the vent pipe, from the highest drain branch connection to the vent terminal or to the connection to a vent header. SPS 382.31(14)(a)2.2. The developed length of the vent stack shall be measured along the vent pipe from the vent stack base connection to the vent terminal or to the connection to a vent header. SPS 382.31(14)(b)1.1. Vent header pipe sizes shall be determined in accordance with Table 382.31-3 with the number of drainage fixture units being the sum of the fixture unit loads of the stacks vented through that portion of the header. The diameter of a vent header shall not be less than any vent connecting to it. SPS 382.31(14)(b)2.2. The developed length of the vent header shall be measured along the pipe from the most distant vent stack or stack vent base connection to the vent terminal. SPS 382.31(14)(c)(c) Branch vents. Branch vent pipe sizes shall be determined in accordance with Table 382.31-3. The developed length of the branch vent shall be measured along the pipe from the furthest fixture drain served by the branch vent to the point where it connects to a vent pipe of a larger diameter or to a vent terminal. SPS 382.31(14)(d)(d) Individual vents. Individual vent pipe sizes shall be determined in accordance with Table 382.31-3. The developed length of an individual vent shall be measured along the vent pipe from the fixture drain served by the vent to the point where it connects to a vent pipe of a larger diameter or to a vent terminal. SPS 382.31(14)(e)(e) Common vents. Common vent pipe sizes shall be determined in accordance with Table 382.31-3. The developed length of a common vent shall be measured along the vent pipe from the drain served by the vent to the point where it connects to a vent pipe of a larger diameter or to the vent terminal. SPS 382.31(14)(f)(f) Circuit vents. Circuit vent pipe sizes shall be determined in accordance with Table 382.31-3. The developed length of the circuit vent shall be measured along the vent from the connection with the branch drain served by the vent to the point where it connects to a vent pipe of a larger diameter or to a vent terminal. SPS 382.31(14)(g)(g) Relief vents. Relief vents shall be sized in accordance with the provisions of subds. 1. to 3. The developed length of a relief vent shall be measured along the vent from the connection with the branch drain served by the vent to the point where it connects to a vent pipe of a larger diameter or to a vent terminal. SPS 382.31(14)(g)1.1. ‘Circuit vented branch drain.’ The diameter of a relief vent for a branch drain served by a circuit vent shall be at least one half the diameter of the branch drain. The maximum developed length shall be determined from Table 382.31-3 based on the number of drainage fixture units served by the vent. SPS 382.31(14)(g)2.2. ‘Building drain.’ The diameter of a relief vent serving a building drain, as required in sub. (7), shall be at least one half the diameter of the building drain. The maximum developed length shall be determined from Table 382.31-3 based on the number of drainage fixture units served by the vent. SPS 382.31(14)(g)3.3. ‘Horizontal wet vent.’ The diameter of a relief vent serving a horizontal wet vent shall be at least 11⁄2”. The maximum developed length shall be determined from Table 382.31-3 based on the number of drainage fixture units served by the vent. SPS 382.31(14)(h)(h) Yoke vents. A yoke vent serving a drain stack shall be sized as a vent stack in accordance with par. (a). SPS 382.31(14)(i)1.a.a. Except as provided in subd. 1. b., the size of a vent for a sanitary pump with other than a pneumatic ejector, shall be determined in accordance with Table 382.31-4. SPS 382.31(14)(i)1.b.b. The size of a vent for a sanitary sump located outside with other than a pneumatic ejector shall be determined in accordance with Table 382.31-4, but shall not be less than 2″ in diameter. SPS 382.31(14)(i)2.2. The air pressure relief pipe from a pneumatic ejector shall not be connected to vent or vent system serving a sanitary drain system, storm drain system or chemical waste system. SPS 382.31(14)(i)2.a.a. The relief pipe shall be of a size to relieve the air pressure inside the ejector to atmospheric pressure, but shall not be less than 2” in diameter where the ejector is located outside and 11/4” in diameter for all other ejector locations. SPS 382.31(14)(j)(j) Vents for chemical basins. The size of vents serving chemical dilution or neutralizing basins shall be determined in accordance with Table 382.31-3 and based upon the number of drainage fixture units discharging into the basins. SPS 382.31(15)(a)(a) Vent grade. All vent and branch vent pipes shall be graded and connected so as to drain back to a drain pipe by means of gravity. SPS 382.31(15)(b)1.1. Except for wet vent piping, the connection of a vent to horizontal drain piping shall be at a point above the horizontal center line of the drain piping. SPS 382.31(15)(b)2.2. Except as provided in subs. (12) and (17), vent piping serving a wall-outlet fixture may not offset horizontally less than 36” above the floor, but in no case lower than the elevation of the highest flood level rim of any fixture served by the vent. SPS 382.31(15)(b)3.3. Vent piping may not connect to a branch vent less than 38” above the floor, but in no case lower than 2” above the elevation of the highest flood level rim of any fixture served by the vent. SPS 382.31(16)(16) Vent terminals. All vents and vent systems shall terminate in the open air in accordance with this subsection. SPS 382.31(16)(a)(a) Extension above roofs. Extensions of vents through a roof shall terminate at least 8” above the roof. Where the roof is to be used for any purpose other than weather protection, the vents shall extend at least 7 feet above the roof. SPS 382.31(16)(b)(b) Waterproof flashings. The penetration of a roof system by a vent shall be made watertight with an approved flashing. SPS 382.31(16)(c)(c) Prohibited uses. Vent terminals shall not be used as flag poles, support for antennas or other similar purposes. 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.
/code/admin_code/sps/safety_and_buildings_and_environment/380_387/382
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administrativecode
/code/admin_code/sps/safety_and_buildings_and_environment/380_387/382/iii/31/13/c
Department of Safety and Professional Services (SPS)
Chs. SPS 301-399 ; Safety, Buildings, and Environment
administrativecode/SPS 382.31(13)(c)
administrativecode/SPS 382.31(13)(c)
section
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