The re-vent or revent pipe is routed upwards above the fixture and then horizontally over to a tee that attaches it to the main stack vent pipe. At the fixture the revent pipe can connect immediately behind the plumbing fixture or it may be connected close to the fixture along a horizontal drain line that serves that fixture. Where the horizontal branch is located more than four branch intervals from the top of the stack, the horizontal branch shall be provided with a relief vent that shall connect to a vent stack or stack vent, or extend outdoors to the open air.
The relief vent shall connect to the horizontal branch drain between the stack and the most downstream fixture drain connected to the horizontal branch drain.
The relief vent shall be sized in accordance with Section The relief vent shall be permitted to serve as the vent for other fixtures. Here we show the main building vent pipe, the plumbing stack vent, connecting inside plumbing drains to a vent pipe that extends above the building roof in order to let needed air into the drains and to vent sewer gases harmlessly above the building.
Below we explain how building plumbing vent systems work and why plumbing vents are needed for drain function and plumbing drain safety. Above the roof plumbing vent height : vent pipes should extend to outdoors above the building roof and should terminate vertically not less than 6" above the roof surface nor more than 24" and must be at least 12" from any vertical surface such as a nearby sidewall.
UPC i Note that there are other restrictions: for a roof that is also used as an occupied space, for example, the vent has to extend at least even feet above the surface and be secured with stays.
Above roof plumbing vent diameter : in areas exposed to snow or freezing or temperatures below 0 degF. Where there is a snow-cover risk snow can block the plumbing vent the vent should extend 24" above the roof surface. The soil stack pipe , as shown in Carson Dunlop Associates' sketch, carries waste from toilets to the house trap if one is installed and there connects to the sewer line extending outside the building and on to a public sewer or private septic system.
The soil stack is the large-diameter main vertical waste pipe or building drain, or vertical portion of the "main drain" in the building. The soil stack pipe is normally extended outdoors above the building roof, as shown in the page top sketch.
Other main building drain piping sections that slope closer to horizontal are connected to the soil stack but move waste horizontally where needed in a building. The waste stack pipe shown in the sketch refers to any other vertical drain piping in the building that does not carry soil sewage from a sanitary fixture toilet.
Typically waste stack piping carries drainage away from sinks, tubs, and showers. A standard plumbing vent pipe is always dry; water runs down the drain line but the vent portion of the piping is dry. NO water runs in it. In contrast with a classic or standard "dry" plumbing vent pipe, a wet vent is a combination drain line and vent line.
To work successfullly, the wet vent piping must be large-enough in diameter that it will never fill with water, thus allowing air to enter the drain system simultaneously with the passage of wastewater draining from fixtures connected to the wet vent system. In many buildings we find that the toilet is located quite close within 5 feet of the main building waste stack. This makes sense because the toilet needs really effective venting. Our sketch above shows a toilet located close to the waste stack - an installation that should work fine.
When you flush a toilet it sends a sudden large volume of waste and wastewater into the building drain waste vent DWV piping. This surge of wastewater can certainly create a vacuum problem in the waste line if the vent piping system is inadequate, blocked, or missing entirely. It is exactly this condition that produces the gurgling or even siphonage out and loss of water in nearby sink or tub traps when you flush a toilet in a building where the vent piping is inadequate.
A toilet that is located too far from the soil stack can be wet vented as shown in Carson Dunlop Associates' sketch.
The drain piping for a sink basin or other fixture located closer to the soil stack than is the toilet can provide a pathway to let air into the horizontal waste piping used by the toilet to carry waste to the soil stack. But a wet vented fixture requires a larger drain pipe diameter in its wet portion as we show in the sketch. This diameter increase helps assure adequate air flow into the drain system in the event that the sink basin in this example happens to be draining at the same moment that the toilet is flushed.
Also note that wet vented fixtures toilet, bathtub, shower, or floor drain are permitted for bathrooms on the same floor level, not between floors. On tall buildings often considered 11 stories or higher , prevent drain venting problems that could occur due to pressure variations in the stack vent system.
A yoke vent, basically an offset relief vent, may be installed on every 5th floor from the top floor downwards. A pipe connecting upward from a soil or waste stack to a vent stack for the purpose of preventing pressure changes in the stacks.
A yoke vent is any pipe that connects upwards from a soil stack or vertical waste stack to a higher location in order to prevent pressure changes in the stack pipe.
Those pressure changes could prevent proper drain venting. In a typical arrangement, a yoke relief vent or yoke vent is constructed by using a 45 degree wye on a soil pipe or waste stack. The wye points upwards and connects using a second degee connecting wye to a separate vertical vent stack pipe at a point higher in the building and usually above any other branch vents that connect to the same vent stack.
The yoke vent pipe diameter is typically the same as per code below or one pipe size smaller per local authority than the drain and vent stacks to which it connects. The upper section of the offset shall be provided with a yoke vent. The diameter of the vents shall be not less than the diameter of the main vent, or of the soil and waste stack, whichever is the smaller. Loop vents may be used at island sinks or "free-standing sinks" where there is no direct route from above the sink's flood rim to a vertical vent stack.
To keep the loop vent dry, that is so that the vent can work without flooding, the loop vent has to connect at the top of the fixture's vertical drain line, and the horizontal portion of the revent pipe must be at least 6-inches above the flood rim of the sink or other plumbing fixture being vented. The flood-rim is the highest possible point that water can rise in the fixture, or the actual horizontal rim of the sink if there is no sink overflow feature. That is, dry vent piping carrying only air, sewer gas, or moisture to above the roof line is unrestricted.
However the piping does need to be protected from nails - use nail plates to protect vent and drain piping both where where piping passes through studs, joists, or rafters. Special routing and connections are required for proper venting of plumbing fixtures such as kitchen island or peninsula sinks or dishwashers - plumbing fixtures that are located where a direct vertical vent stack connection is not possible.
We had a plumbing inspection where he stated: Plumbing Venting tees - installed backwards.. He gave no indication where or how many.. We are a homeowner doing our own work, so just trying to narrow it down. From this can you help identify if at least.. But I think that your inspector says that plumbing vent tee connections like those I show in our illustration are installed upside down so that water down a wet vent won't fully drain into the vertical drain line and vent stack.
Follow the vent piping in your building, locate all joints, connections, tees, photograph them, and post photos here or ask the inspector to be more specific if some but not all connections were improper. Our illustration shows the proper as well as an "upside down" position of a plumbing vent tee. Note that if the tee, seen at the vertical plumbing vent riser, were upside down, water would be trapped in the horizontal piping, ultimately inviting clogs. Use the "add Image" button one per comment and post photos of your plumbing drain and vent piping tee connections and we can comment further.
Watch out : if plumbing tees are installed backwards or more-accurately, upside down, that's a sign of an inexperienced plumber doing the work. You need to be alert for other drain-waste-vent plumbing mistakes and problems. To understand which generation of the model building code or plumbing code applies to your specific project you will need to check with your local building official.
For example many jurisdictions are on the IPC or still older versions. On by mod - code requirement between a stove vent and a plumbing vent on the roof exterior? Aaron Are we discussing a woodstove chimney? Solid sawn lumber header and girder spans for the exterior bearing walls reduce span lengths to allow 2 Southern Pine design values.
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The international building code illustrated handbook pdf free download provides all the information needed to get construction jobs done right and achieve compliance. An invaluable companion to the ibc international building code pdf , it is a must have resource for building officials, architects, engineers, contractors and all building construction professionals.
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