Tying into a vent stack The vent stack is the actual part that receives branch drains. The toilet flange is 5 feet from the main stack. Aug 1, 2024 · The bathroom exhaust fan tubing is directly connected into the sewer vent and is held on with what looks like duct tape. I’m wondering if I can tie into this plumbing in the right, which I imagine is been a dry vent for something down stairs. Tie-in should be below the bathroom fixtures’ highest drain to avoid backflow. The methods have been laboratory tested to determine sizing and installation requirements that provide proper venting to a drainage system. Often it is less work to plumb a new vent through the roof or tie the new vent to the existing one up in the attic below where it goes through the roof. Vent stacks Ask your do it yourself plumbing questions and get free answers as well as DIY information about faucets, toilets, pumps and water filters from plumbers at Plbg. Is this improper? There are no traps and the units are located in the attic. This is why drain vents open above the roof line or use one-way air admittance valves. Note that the sanitary T for the vent is installed upside down, to help air flow Tying in to cast iron with PVC is a great way to add new waste lines. Jul 7, 2015 · I am planning to tie the two bathroom sink vents into that pipe before it goes through to the second floor. Apply plumber’s putty around the base of the wye fitting and branch line connection to ensure a watertight seal. Jul 13, 2007 · is it okay to tie in the pan drain along with the sec drain pan into the vent stack in an attic install as long as you use a float switch. Sep 3, 2023 · I am DIYing the plumbing in my new addition and planned on tying the drains into the main stack in the basement and also the vents into the main stack in the attic. My question is how to approach tying all the drains together. Nov 10, 2008 · Cutting in a drain as specified can be done and will most likely work just fine, but according to code a vent will also be needed someplace between the p-trap and where you go down to tie into the stack, or the stack itself. I want to put the washing machine on the other side of this wall and put in a P trap which will then tee into the vent stack. Apr 8, 2014 · The sinks, shower and bathtub must also all connect to the existing drain and waste vent system, which means they must connect to the sewer and to the main vent stack. I am going to tie into the drain with a copper tee. Ask your do it yourself plumbing questions and get free answers as well as DIY information about faucets, toilets, pumps and water filters from plumbers at Plbg. I posted a picture where the read line would be the wet vent. So, what is the difference between a vent stack and a stack vent? A vent stack is a vertical pipe parallel to the waste/soil to which all floor drain vents are connected. I plan to run a 2" vent from the 3x3x2 heel fitting back to the stack, and tie in the 2" line coming from the tub and sink. The concept is very much in line with an island vent loop, which do work, tho not perfectly. When there’s an obstruction in the plumbing vents, it usually originates there. No-hub couplings make it easy to connect to existing cast-iron drain, waste, or vent li To ensure I understand correctly (for future knowledge): The partial vent would run from the blue pipe in the OP's drawing, up the wall, then would connect back into the stack the highest drain entry point in the "upstairs" bathroom, tying it back into the upstairs bathroom's vent line? Please note: Inappropriate messages or blatant advertising will be deleted. I intend to tie into the 3" copper vertical drop with my PVC. I used solvent-weld fittings for the DWV lines in the bathroom floor, and was planning to do the same when tying into the 4-in. We're on a septic system. As to the upstairs, I think only the sink was changed (which now empties into the middle 2" line down below. You can't tie into the laundry drain as it can only accommodate the washer May 23, 2022 · The loop vent still requires tying into the cast iron vent stack, which sounds difficult to me, but perhaps I'm wrong. You would have to tie it into the washer vent. Feb 16, 2020 · My question - the new vent for the basement bathroom group - does this have to run all the way to the attic to tie in to existing dry vents? OR - can it tie into a dry vent in the 1st floor 1/2 bath? OR - can I run the new dry vent along basement ceiling to tie into that existing laundry drain vent? Property is Denver CO area, using 2018 IPC I attached some photos of my existing system and a sketch I made of the, rough layout. The toilet will be against a wall with a slanted roof. Sep 22, 2008 · Back the truck up! That cast iron stack coming up through the roof is the vent from the lower floors. I plan to add a clean-out on the 3" line that runs mainly horizontal at the Welcome to Plbg. And tie the first floor BT (tub) into the vent. Some codes allow for a wash basin and clothes washer to be each other's vent if they're within five feet, but this introduces new challenges. The duct would tie to a Y that points upward; between that, the draft created by the stack itself, and the damper on Nov 12, 2025 · This configuration, often a dry vent, connects to the drain line after the P-trap and rises vertically, either independently or by tying into a main vent stack. We cannot be held responsible for bad or inadequate advice. Feb 20, 2015 · Bathroom has 3 inch stack that turns into 4 inches in basement. If it rises to the level of the connection and proceeds horizontally from there, you use a vent tee, which doesn't have a sweep. If you can tie into the lower stack below the lower bathroom and run from that point that would be the way to start. But, unfortunately, the more direct vents you have, the more holes you have in your home. No-hub couplings make it easy to connect to existing cast-iron drain, waste, or vent li If it is a vent I would cap the connection where it ties into the main stack and run the vent over to where the fixture you're roughing in is going. In this plan, I would tie into the stack using a 4x4x3 wye and a 45 degree fitting to get the pipe vertical. May 3, 2020 · Can the sink above tie in directly to the stack with a Sanitee without a vent since it is less than 2ft of horizontal run from the trap to the stack or am I safer running vent line to the attic and tying back into the main stack? Jan 14, 2021 · Is it possible to vent the new sink/tub into the existing 2nd floor bathroom vent inside the attic? I would like a avoid having to make another hole in the roof, but am assuming the new stack needs to be vented somewhere anyway so I may not have a choice. I intend to create slope of at least 1/4" per foot, but anywhere that may not be necessary will help with wiggle room as I connect to the main stack wye. You can connect other vents to this line to minimize roof penetrations, though. This is… well, it's a long way from the basement to the past the 3rd floor. Jun 29, 2010 · Before you can insert your added drain lines into the main waste vent, you will have to first check the incline or grade on your pipes. The vent, also 1. Contractor's Assistant: When did you last replace or repair the pipes? Welcome to Plbg. The venting methods have also been field-tested, establishing a long history of satisfactory service. Jan 9, 2015 · It sounds like I cannot tie a drain into a vent, although a quick google search brought some things up like it being alright to create a wet vent in bathroom vent systems, such as the one I was planning, as long as you increase the diameter of the vent stack piping one size up to account for water flow potentially blocking some air flow. Oct 2, 2006 · I’ve researched the threads and found only one reference to substantiate not having condensate lines piped directly into vertical plumbing vent stacks. Toilet hooks to stack which goes through the roof. ASSEMBLE THE TIE-IN PLUMBING. On the other hand, a stack vent is the uppermost pipe section of the waste stack above the highest fixture. com Dec 19, 2020 · The existing vertical pipe is a drain, it's also called a stack because it's at least a full story high. com Oops! We ran into some problems. I have three fixtures that tie into this 4" waste stack. The connection point must be positioned with intentional height to prevent contamination. You are most likely better off just running an entirely new fan exhaust all the way out. How does this look? I have a 4" hookup to my sewer. Jul 11, 2007 · Can you define "main stack" for me? I'm thinking I'll tie the tub, toilet and lav together @ 2' and vent the washer seperate. 1 of the International Residential Code (IRC). You will need a new vent from the lower floors. I had a gas water heater with a 4" possibly aluminum stack that runs up to and out chimney. Are there any options for connecting into main stack for venting branch below waterline? Could I go up for a few feet with a with a wye join and then come back down? The reason for trying to come u Jul 15, 2014 · Need help tying a shower into a toilet drain line I am currently roughing in a bathroom. com Aug 22, 2022 · The Toilet has a 3" Copper Vent running through the wall and out the roof of the home. Any help and advice would be appreciated. (interior measurement). Sep 22, 2008 · The condensate line empties with an airgap into an 1-1/2 trap which tees into the vent stack. It's no longer used. Dec 16, 2024 · The line will then support a 1. I'm planning to individually vent all of the new bathroom traps and pump unit, and tie those vents to a common vent line that I was planning to tie into my existing vent system - the question becomes, where? Jan 7, 2005 · Here is what I want to do, does it make sense? Tie into the 2 inch copper drain stack about 18 inches above the floor. I've been warned on a few forums not to try it myself and information is scant about how to cut into the stack pipe. pipe as a precaution and currently have the stack capped off in the attic adjacent the plumbing vent stack. You can run a new line out into the yard to connect to the line to the septic tank, though, so you don't necessarily have to go through the floor - you might be able to go out the wall below the frost line and trench to the Mar 9, 2008 · I assume this means when you are tying vents into drainage lines. I’m roughing in the drain-waste-vent (DWV) plumbing for a new second-floor bathroom in my house. It's clearly black cast iron in the attic, but where I'm looking to tie in it's white - maybe galvanized? Anyway, are there special tools to cut into iron or galvanized dwv pipes (3") here? Jan 4, 2023 · Would that vent serve this new sink drain as well through the stack or do i have to have a vent line come off of the new drain and go up above any drains and then tie into the Vent in the wall or attack? Sounds like tying into drain is the easy part, tying into a vent will be difficult but doable. In this comprehensive guide, we’ll cover everything you need to know about combining the flue vents from your water heater and furnace. It is a cement basement floor and there is a drain cleanout at the base, so I will tie in just above the drain cleanout. The existing soil stack is 3" copper to municipal sewer. Learn how to add plumbing vents during a home remodeling project to safely vent kitchen and bathroom drains. How should I cut and insert the tee? Your advise/help will be mostly appreciated. Unfortunately, it is generally forbidden by most building codes to tie into a wet vent if you are downstream of the toilet drain. Nov 18, 2012 · A wet vent is when a fixture is using a vent. com (aka: PlumbingForum. An error occurred while the page was being generated. Please try again later. 5" sink drain, a 2" vent for the toilet (that will tie into the sink vent and up through existing vents - not pictured) and ending with a 3" elbow and toilet flange. Then you tie another fixture into that vent above it. 4) Can I combine the sink/tub drain and then tie that into the new stack? Ask your do it yourself plumbing questions and get free answers as well as DIY information about faucets, toilets, pumps and water filters from plumbers at Plbg. It wouldn't affect the stack drainage in any way since it already has a vent running continuously on the 3". . Mar 8, 2021 · The basic answer is you can't tie your basement bathroom vent in there. For this type of setup, the use of a wye fitting and sanitary tee is very important. You could combine all of the vents into a single stack, so long as you have the room to stack all of the fittings together and the venting demand does not exceed the necessity for the fixtures it is serving. You'd need to run your new vent alongside and parallel to that vent, then in the story above Sep 28, 2012 · Assuming our new construction waste pipes are all trapped properly there shouldn't be a chance of sub-slab gasses getting into the house. Is it possible to combine these into two or even one vent roof termination? My plan Got a question about connecting a washer drain into a stack? Explore expert answers on proper venting for your plumbing setup and ensure everything flows smoothly! Welcome to Plbg. Can anyone When connecting a washing machine drain to a 3" waste stack, ensure the drain line includes a proper P-trap to prevent sewer gases. The toilet can't be vented from main stack vent. To tie into that stack on the diagonal, are you OK with some vertical piping close to the slab entry, or do you want to stick it all closer to the stud wall? For the former, you can just cut in a 3" wye with the branch inlet vertical. Jun 13, 2023 · NET: The vent for the vanity (is indicated by the light blue dotted lines)- From the vanity drain, it runs up the vanity wall across the bathroom above the ceiling, then through the ceiling into the attic where it ties into the main stack. Aug 18, 2017 · If that stack runs straight to the roof and nothing drains to it unfortunately you would still need to tie in on the floor above the horizontal sewage line. All the second floor drains will tie back to this pipe. and how much will pvc deflect in the hot attic Jul 16, 2009 · In this situation any water in the pipe running uphill away from the sink would drain back towards the sink and after the "peak" would drain downhill towards the vent stack witch would then drain into a washing machine drain. A traditional 2 bathroom home can be vented off of a single 3" vent. Customer: Hi I have a question about tying into an old steel vent pipe for a basement bathroom. Mar 10, 2009 · Plumbing and Piping - Tying into main stack for new basement toilet - I have browsed several posts here and I can not find anything related to the scenario I am in. So the current plans were to find a run all the way up the third-floor. Your fan is probably designed to use a 4" duct Oops! We ran into some problems. Mar 27, 2024 · What would be the right way to tie into future vent in the basement? I assume F. com Jan 23, 2024 · My main stack is 4" PVC and I could tie a wet vent into the horizontal run right before the vertical drop that then goes through the wall to the septic tank. com Ask your do it yourself plumbing questions and get free answers as well as DIY information about faucets, toilets, pumps and water filters from plumbers at Plbg. 5, tees off about 1 foot and takes a 90 turn up through the wall and penetrates the roof. in the picture is Future Vent - especially as its in the basement, so I would hope nothing is "on" it other than up to to vent. The main vent is stack is often, but not always, a continuation of the soil stack, which is a 3- or 4-inch waste pipe that extends vertically down from the uppermost bathroom to the sewer. Jun 9, 2022 · The only thing draining into the top of the stack shown is a lav? I'm pretty sure that the ejector pit vent should rise to the story above and connect to the lav's vent at least 6" above the lav flood rim, rather than connecting to the lav drain. In practice, the events from all the fixtures often meet in a common pipe that connects to the main stack at a point higher than the highest plumbing fixture in the house. You may not be allowed to use that "stack" as a vent, since drainage is likely being carried from the floor above. com is strictly for the exchange of plumbing related advice and NOT to ask about pricing/costs, nor where to find a Oct 2, 2006 · I’ve researched the threads and found only one reference to substantiate not having condensate lines piped directly into vertical plumbing vent stacks. So you see in case D that I modified the washer vent is dry as well as the sink. The previous drain went into the wall on the side, which was vented. May 4, 2020 · We can't tie into the main vent stack (we can't connect it high enough up). is having a short horizontal section so low kosher? Jan 28, 2012 · Once a pipe is configured as a vent, it cannot become a drain without reconfiguration. If you are tapping into a stack that acts as both a drain and a vent, start by assembling a section of plumbing with a sweep T at the bottom for the drain line and a sanitary (or vent) T at the top. You absolutely CANNOT put waste from your attic bathroom into that. I want to install a shower upstream from the toilet, (so the shower is the farthest fixture from the stack). This is likely to be unpleasant and possibly unhealthy. Use a standpipe at least 18" high and secure the drain hose Jul 14, 2023 · I'm wondering if I should cut out the existing connections to the vent stack, add a new tee to the soil stack, and tie into the vent above. Everything above this tie in point on the main stack is dry/vent. That 1-1/2" pipe segment is a vent for the two fixtures on the floor above coming in at the two san-tees (bathtub and shower?). 0:00 Sep 23, 2024 · Hello experts! With the help of the forum, I was able to plumb up a bathroom this weekend! Now I need to tie it into my stack. Apr 15, 2016 · The shower drains through the floor into a 1. com is strictly for the exchange of plumbing related advice and NOT to ask about pricing/costs, nor where to find a Aug 7, 2015 · The toilet and tub are both within 36" of the main 4" stack and are in line with each other (it's a tight space). Jan 9, 2009 · Besides cutting out a section, is there an "easy" way to tie a 2" PVC vent into a verticle 4" cast iron pipe? I say easy and without cutting because there is no way easy way, without gutting a bathroom above, to support the cast iron pipe above where I'd have to cut it. I want to run the P trap straight back into the wall with the supply lines and tie it into the 3" toilet drain which is a wet vent. Mar 30, 2013 · Drainpipes all slope downward and tie into the stack, while vent pipes extend upward and meet the stack higher on the line, often in the attic. Can anyone Jan 16, 2022 · Here is an elevation view of what we're considering. As far as I understand, that makes it OK to tie in the new drain where I am. Feb 9, 2004 · Can I vent up to attic from this 42" with 1. We need to add a tee into that pipe. Mar 24, 2021 · Tie the bar into your waste stack with its own vent. Now you can tie into existing plumbing to easily and quickly complete a home project or repair. Oct 22, 2023 · The quick answer is yes, in many cases you can vent a gas water heater and gas furnace together. The fan will be noisy since the plumbing vent is often too small for adequate air flow. See attached images A couple notes: Nov 30, 2023 · The vent would then have a 1 ft vertical section of 2 inch pipe before going up a few feet to tie into the vent stack. Mechelle Sep 22, 2009 · The only way you can hook up to a stack with a bathroom below is if all the lower fixtures are vented. Sep 25, 2008 · We need to connect the basement bathroom sink drainage(on the right of the picture) to a vertical pipe. We're not really concerned about radon but installed the sub slab perf. V. If you do experience a clogged vent, one of the first places you’ll notice the problem is in the toilet. The image shows how it should look. The stack is the only vent for the toilet. Jun 26, 2024 · I'm adding a DWV system to a basement and need to tap into a 3 in dry vent stack that currently serves a 1st floor bathroom with toilet, tub and lav. Key points: Mar 15, 2022 · A vent stack and a stack vent are two terms that most folks used interchangeably but they shouldn’t. The roof is spray foamed and I would rather not cut into it along the pitched roof. Oct 8, 2025 · To install a new DWV branch, from just below the roofline down and tying into the main waste linmore, one of the less glamorous but necessary steps is to tie into existing plumbing. Building Foundation Plumbing Drain Pipe Layout And Assembly For Small House - Part Two Rough Plumbing Pipe Layout, Gas And Dryer Vent For 850 Square Foot Two Bedroom House - Part Six Radon systems are clearly identified and not tampered with. Mar 22, 2013 · If the vent slopes up to the main stack, you tie it in with a Y-fitting. There are venting issues that pertain to the upper level also. Oct 2, 2025 · For most modest to moderate remodel jobs, tap into an existing drain/vent line rather than run new pipes all the way from the main. Main stackyou're supposed to keep the vent stack above the same size as the main below all the way through the roofwhich in this case is a minimum 3" for the toilet. In many tie-in situations you need to tap in for both the drain and the vent. Aug 14, 2017 · My solution is to simply wrap the vent up and around the outer portion of half the staircase, add a sanitary tee to the 3" main stack right above the main floor toilet's tee, and tie the vent in there. If you Sep 9, 2021 · Vent stack / stack vent is really the same thing. Please follow external links with caution. Aug 11, 2007 · I am at the end of building a master bath. Ensure efficient drainage and prevent sewer gas intrusion. Sep 9, 2021 · If two fixtures are on opposite sides of a wall, they can tie into the stack with a sanitary cross. A separate vent or air admittance valve is often required to maintain proper airflow and prevent slow draining or gurgling. In this video series, Matthew Millham teaches you how to tie in to existing cast-iron drain/waste/vent lines with new PVC. Sep 16, 2021 · Grasp the fundamentals of plumbing venting with this detailed vent diagram. Jun 11, 2020 · I currently have six plumbing vent pipes penetrating my roof. Our existing plumbing is vented through an addition, so a new 3" vent stack has been added to our attic roof. When reroofing becomes necessary, I'd like to reduce the number of roof penetrations in order to reduce leak potential and for aesthetic purposes. You can add another drain at any point in the stack vent or vent stack assuming it's 3" or 4". I used 3" PVC for toilet, shower (2") and sink (1 1/4") feed into this. 5 pipe and tie into existing 3"stack that the rest of the house ties into? Note: 2 full baths already tie into this same stack. Thanks. We’ll discuss the pros and cons of common venting, what types of Jul 10, 2009 · How can I add a horizontal 2" vent to the horizontal 3" drain? Also, is it OK to have a shower trap 8' away from the vent? Thanks! I would tie the second floor SH (ower) into the vent. For example, if you are adding a bathroom in the basement, you need to tie it into a cast iron stack. I am adding a utility sink in my basement and it seems like the easiest way is to tap into the existing vertical line. com) where plumbing advice, education, information, help and plumbing related suggestions are provided by some of the most experienced plumbers and plumbing contractors anywhere who all wish to "give back" to society. May 10, 2024 · This comprehensive guide will delve into the intricacies of how to tie into a vent stack, providing step-by-step instructions, safety precautions, and troubleshooting tips. Meaning its not always dry. 42" off the floor. The air gap makes sure that the units air handler does not suck any sewer gas from the plumbing vent. May 3, 2017 · I have a 4" PVC stack going from below the slab and through the roof to provide passive ventilation of radon from below the slab (potential radon—not yet measured). If you connect the vent as you proposed and that horizontal line were to back up sewage would make its way down into the vent. It is in IRC 2003 P3101. If you Apr 25, 2006 · My question is about tying into the stack. You can run a new line out into the yard to connect to the line to the septic tank, though, so you don't necessarily have to go through the floor - you might be able to go out the wall below the frost line and trench to the 1. Or, if I'm okay to continue using the vent stack as a drain for this application, cut the wye off the backflow preventer and run a new horizontal over to my sink. If that stack its pumping into has a vent through the roof, you (not a licensed plumber, because this isn't exactly a legal vent) can put a T into the stack, cut out that stupid studor vent setup, and plumb the vent into that T. Thanks, Mike It all depends on the fixtures the vent is servicing. However, there are important guidelines to follow to ensure proper draft and ventilation. Tying into a cast iron vent stack is a crucial … Aug 26, 2017 · No, if you are tying into an existing drain and vent stack, the new vent connection must be at least 42" above the floor of the highest fixture connected to the stack. The fixture vents all tie into this pipe, which is called the main vent stack. My Question is is it possible to drain the Vanity into the Toilet vent before the toilet flange and then tie into the toilet vent stack above to vent the vanity? my only other option would be to tie into the 3" PVC after the toilet Finally, you can tie into another vent using a sanitary tee, implicating that independent roof penetration for each vent is not necessary; they can be efficiently combined into one or two vent stacks. The code violation will affect insurance and can be problematic when selling the house. I will see if I can add a link to view photo. -diameter PVC waste line that runs along (and out) my basement wall. If you Would i need to open the whole concrete floor to add wye for the sink and toilet and then have a vent pipe tie into pipe D, as well as a 3" combo to also have a vent pipe tie into pipe D? I am a little perplexed if they included the rough-in but no vent pipe but i hope i am understanding this wrong. Since 1996 we have been free without popup or other invasive ads and known to be the best online STRICTLY PLUMBING advice site. Kitchen is on a different wall and seperate. I understand that I need to run the 3" vent from the basement to the new vent in the roof. I It won't always be easy, because of the new vent pipe you will need to connect to a vent pipe above floor and you might need to get creative with this installation to make it happen. Oct 17, 2025 · Why is the Toilet Bubbling? All the pipes in a building’s vent network tie into the main vent stack, which is typically located on your roof. So that vent can't combine with any other vent lower than 6" above the flood rim of those fixtures. The simplest and most cost-efficient way to add a new fixture or group of fixtures is to Oops! We ran into some problems. Your plumbing stack functions in much the same way but the vent allows you to draw air in to your system prevent creating a vacuum in the pipes. Dec 13, 2024 · When planning any plumbing addition, you must first consider code restrictions; the limitations of your system’s layout; and, of course, your own abilities. But because the drain line is locked into place, I realized I can’t just cut out a section, slide Tying in to cast iron with PVC is a great way to add new waste lines. You have two big issues here. Aug 18, 2015 · Plumbing and Piping - Installing PVC wye into cast iron stack - What is the right way to insert a PVC wye into an existing cast iron stack, as shown in the drawing? Customer Ok. 3 Use Limitations. The connection for the bathroom sink is broken at the stack so I am going to replace the whole stack and drains with pvc. I hadn't heard of simply oversizing the drain. com Oct 19, 2022 · These typically tie together into the main vent stack in the attic. Learn how to tie into existing plumbing stacks in new construction or renovation projects effectively to optimize flow and minimize clogs. After the 4"wye, I am planning to connect 3" pipe. This is called a common vent and can be found on back-to-back sinks. Sink and bath hook into stack. com has no control over external content that may be linked to from messages posted here. ( it keeps things flowing smoothly) your radon system Is capturing and redirection radon gas out. Slope is shown exaggerated below. The toilet waste line is 3" and the stack is 3". Jan 3, 2013 · It is mightily difficult to tie in the lav vent to the 3 inch stack in the attic but simpler just to have another roof penetration instead. I want to tie the lav sink and kitchen sink into the same drain using a wye Follow along with our Plumbing and HVAC Manager Marlin Sundberg as he goes through the step-by-step process of plumbing a horizontal bathroom group with one vent on a recent remodel project. Is this ok to tie in horizontally like this? Aug 8, 2022 · My thought to vent the 1st floor bath is to "wet vent" it by using a sanitary tee to tie a 2" vent line (listed as possible vent in the picture) into the 3" waste line and then connect it to the 2nd floor bath vent which goes out of the roof. 2 days ago · Tying the Branch Vent into the Main Vent Stack The branch vent connects to the larger system, typically the main vent stack or another branch vent. 4" drain from toilet highest point in stack set at 1/4" per foot slope and attached to stack with long sweep 90. Aug 25, 2017 · The bathroom below this one has a vent that comes up into the attic separately and ties into the main 4-inch stack above where I'd be tying in the drain line. If there is another vent fan duct, you may be able to tie in, but probably not unless you upsize the pipe that goes from the junction to the exterior. The basic rule is that a vent must not connect to the stack lower on the stack than a drain connection. 5" drain. A good first rule is that you do not want a line going into the waste vent any closer to the vent cap outside your home than 4 feet. Aug 16, 2016 · I've had a few quotes for installing a new 4 piece combined basement bathroom / laundry room (dryer, shower sink toilet) as apart of getting our basement finished. Jul 26, 2024 · What To Know Tying into a cast iron vent stack is a crucial step in plumbing installations, allowing fixtures to release gases and maintain proper drainage. A traditional dry vent uses a separate pipe to introduce air and remains free of wastewater. Dec 1, 2022 · It’s helpful if you are adding a bathroom and don’t want to tie the vent into the main plumbing vent, then this is ideal. Vent from first floor bath will be connected just above where vents of 2nd floor bath tie in. Currently the main 4" stack serves as a combined vent / drain for a 3 piece washroom (2nd story), and as a drain for a (1st story water closet - 2 piece, that is separately vented with a 2" vent through the roof) Jun 10, 2018 · Ok, so I can add a vent through the roof and from the bottom of that vent pipe, tie that into the drain line where my bathroom sink drains into? Sorry for the questions, but I just don't know enough about how everything should connect to fully understand it. It is a vent pipe that goes to the roof. Sink has separate vent out through attic. This article will show step-by-step how to do it the correct way to avoid leaks and save money. The only other way to do it to use that single vent would be to use a double fixture Please note: Inappropriate messages or blatant advertising will be deleted. First is that you have a serious risk of venting sewer gasses into your home. Feb 1, 2023 · I'm trying to determine how to best vent plumbing for basement bathroom I am putting in. In talking to a plumber a while back he said when I do Sep 8, 2025 · Learn why venting is important when planning a plumbing remodel and which plumbing vent diagram is best to follow based on the layout of your space. Although it’s usually straightforward to route supply lines to a new location, tying into drain-waste-vent (DWV) pipes is a different story. Proposed additional drain is in second photo. I also doubt this Mar 8, 2021 · The "Is this correct" is a dry vent for the shower tying into the vent also used for the work sink. Can you take a peak at my drawing and see if it's horribly flawed? I don't have any experience with isometric drawings, but I think this is called a "wet vent" type system. Jun 11, 2024 · A vent stack, also known as a plumbing vent, is an essential component of your plumbing system that plays a crucial role in maintaining proper drainage and preventing plumbing issues. Plbg. Oops! We ran into some problems. Pictures and tool list included making your repair fast and quick. 5 inches in diameter. Customer: I am adding a bathroom on the second floor. The plumbing vent system shall not be utlilized for purposes other than the venting of the plumbing system. Aug 17, 2020 · Chapter 9 of the IPC describes a variety of methods to vent plumbing fixtures and traps. The stack vent is the part that extends up through the attic and put through the roof to the vent terminal. The space between the two fixtures is a wet vent. It is a vertical pipe that extends from the drain line and is open to the atmosphere, allowing air to enter and exit the system. Jan 28, 2012 · Once a pipe is configured as a vent, it cannot become a drain without reconfiguration. Can a toilet on the second floor hook into the existing stack? Does it need separate venting, if so? Don't know how to paste my drawing. Is there any reason I can't tie into it with the bathroom ventilation duct? I like minimizing roof penetrations. Second is that a drain vent is typically too small and too moist to properly vent a bathroom fan. My question is once in the attic and all vent lines are dry, is it legal to have a San-T laying on its side to tie branch vents to main vent line? Since the line is always dry it seems as though it is fine, but I have been wrong before. Both of these vents can tie together 42 inches above the floor and run it into the attic to penetrate the roof our run overhead to laundry and tie them into that. The new bathroom will be perpendicular to how the drainage flows out of the house. Please refrain from asking or discussing legal questions, or pricing, or where to find and/or purchase products, or any business issues, or for contractor referrals, or any other questions or issues not specifically related to plumbing. Oct 18, 2025 · In this setup, you can also direct the waste pipe into a vent stack or soil stack and tie into the stack with a wye fitting with the latter facing downwards. With your new location 35 feet away from the main stack (which is of course vented), you're too far away from that one, so you'll need to tie into another vent stack. Can I disregard Customer: Is it permissible under building codes to tie in one vent stack horizontally using a "T" connection with another? I have a kitchen wall on a slab that contains a vent pipe services the kitchen sink, please? The current venting stacks are 1. Aug 30, 2011 · You can't tie a vent fan outlet into a gas appliance vent pipe, ever, under any circumstances. I want to remove the wall that contains the venting pipe and re-route the venting pipes that service Ask your do it yourself plumbing questions and get free answers as well as DIY information about faucets, toilets, pumps and water filters from plumbers at Plbg. However, depending on the size of the home and the location of the bathrooms and other plumbing fixtures, there may be more than one vent stack sticking up through the roof. I've relocated a sink to the opposite side of the room and provided it with a vent as it is ~6'-7' away from the stack. Oct 9, 2017 · Hey all, I am planning on adding a drain to an existing vertical stack in our basement. How the shower branch connects and vents is what is left to figure out. The nearest main stack is around the corner and kind of a mess with connections. Use a 3/3/2 tee. Sep 22, 2021 · A bathroom fan should never be vented into a plumbing vent as this violates Section M1501. Nov 12, 2015 · Currently, the bathroom and kitchen sink drain directly into my houses main 4" stack individually. ehexw rjax mkkkl rft trek tlaiygs azu byecnnu stzfb itlyzrb htqk xhhq xvhpq qon nfq