Questions tagged [drain-waste-vent]

A drain waste vent is used to allow drain water to flow freely by permitting air the enter the system, usually through a vent stack or an air admittance valve. Use with the [plumbing] tag

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41 views

How should this sink be vented?

We are remodeling our kitchen and moving the sink from against a wall to a peninsula. You can see below what the plumber put in. The new sink drain is lower left (in blue). The drain eventually ...
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1answer
35 views

Can I add a sink drain to a stack serving the floor above?

A local plumbing company (big name) said that anything draining from upstairs would suck my p-trap dry. I asked about the mechanical vents, and he said it would not work. He went on to tell me that ...
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Purpose of septic vents both in the yard and also through the roof?

My house has both septic venting that goes up through the roof and also a vent in the yard. The roof vent is standard, with all the fixtures passing through traps and then draining down eventually ...
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Plumbing plan for freestanding tub

remodeling my master bath (3rd floor), replacing the old acrylic shower/tub unit with a clawfoot tub. Want to make sure I'm doing the plumbing correctly. Tub outline (roughly) in black. Plumbing ...
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Why does one of my bathroom sinks drain slowly when the water is running, but drains quickly when filled and drained?

One of my bathroom sinks drains slowly with the water running ( like when brushing your teeth ) but drains quite quickly if I plug the sink, fill it all the way, and release the drain plug. When the ...
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1answer
48 views

What material is my waste stack made of, and what can I do with it?

A number of years ago I had a plumber out who told me what type of waste stack this is, but I've since forgotten, and cannot find info online. He indicated that it should be replaced eventually (of ...
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45 views

How many twists and turns can a vent pipe take?

I'm replacing a bathtub in the basement and by the looks of it, its trap is not vented. I want to know if I can put a vent pipe in the location I've identified as most feasible and secondly, if it's ...
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45 degree offset at base of vertical dwv stack

I'm rerouting a vertical dwv stack that transitions to the horizontal within the slab in my basement. I would like to move the stack over one stud bay (about 16") for better placement where it enters ...
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Plumbing island with low basement headroom

What is the difference between whats being done in this picture and taking the vent pipe and attaching where marked in red. Seems vent is only slightly raised.
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27 views

Condensate drain termination

i have a 40mm boss connection at the top of a horizontal soil stack that runs in the room. I'm intending to put a washing machine stand pipe at the end of this. I also have a Vaillant ecotec pro 28 ...
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43 views

Proper use of a side inlet elbow in bathroom DWV situation

I'm renovating a 2nd floor bathroom in a 95 year old house. I'm not changing the layout much except for replacing the existing standard toilet with a wall toilet and slightly changing the location of ...
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31 views

What is the proper and best way to drain and vent this bathroom?

The green lines are existing vent for shower. The black lines are proposed bathroom sink drain and p-trap. The red lines are option 1 for vent for bathroom sink. The blue lines are option 2 for vent ...
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1answer
35 views

When is a separate vent not needed?

I was of the understanding that every trap needs a vent and that all the vents for all the traps tie into the vent portion of the main stack which vents through the roof. I came across this diagram ...
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What is this tube sticking out of my roof?

I'm not sure what kind of vent this is for, but I'm wondering if its supposed to have a cap to protect from rain. Sorry for lack of description. I'm completely ignorant to whatever this is. If it ...
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1answer
146 views

Can anyone explain what this pipe is in the basement?

We just bought a house and are getting a new washer/dryer setup, but the old one is slightly confusing. There is a switched pump to pump out the laundry water. I don't know if this open pipe above ...
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47 views

Need help roughing out DWV for new double sing location

I am trying to move a double sink vanity to the wall on the left where we closed in the closet door. This 1977 floor plan didn't make a lot of sense to us so we are doing a full remodel of the ...
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1answer
82 views

Toilet Refuses to Flush

Earlier this month, we starting having problems with our sewer line; it began with the downstairs toilet flushing very slowly, then not flushing at all, then backing up when the upstairs was flushed. ...
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1answer
46 views

Plastic push-fit vs.compression joints

I want to know the use scenario of both, I have a 40 mm drain pipe in the ground and 40 mm shower trap pipe so I want to connect them both. I guess for my use scenario it might not matter much due to ...
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29 views

Should AAV be installed prior to water testing new DWV system?

I'm adding a bathroom in my house and preparing for my rough-in inspection which will involve plugging the main waste line and filling everything with water to test for leaks. I'm using an air ...
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27 views

Bathroom remodel DWV

I am in the middle of a bathroom remodel. At this point the final configuration will likely be determined by the drains and vents required for a free standing tub, toilet and sink. The existing ...
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2answers
91 views

Other options for an air admittance valve besides underneath the sink?

I am re-doing the plumbing in my 1950's house and the ventilation is really poor. I have replaced the entire cast iron stack from the basement sewer up until the beginning of my second floor with PVC....
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35 views

Water softener standpipe question

I have a 1 1/2 inch standpipe coming off of a 2 inch drain pipe in my basement. The only thing before the stand pipe is the kitchen sink. And after the standpipe is a pipe coming down from the washing ...
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40 views

Toilet and given vertical soil stack and no wall space behind

I'm planning out a new second floor bathroom in a historic home and I'm not finding many examples. The best placement for the soil stack is to come up directly under the toilet. The best place for ...
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1answer
89 views

Eliminate center stack to finish basement?

I'd like to eliminate my center stack in order to finish my basement. It's for my hall bath. I have another stack along a perimeter wall inline with the same joist, but around 13 feet away. Will this ...
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1answer
47 views

Venting question for new shower install to existing half bath

I am looking to add a shower to my current half bath. I plan on running the shower drain line to the existing toilet waste line. My question is: Do i need to run a separate vent line from the ...
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1answer
47 views

Is this product suitable as a solvent cement for abs pipes?

I have this at home: Glue and I need to solvent-weld these abs drain piping: pipe and elbow Can I avoid purchasing solvent cement? Or would that present some problem? Thanks.
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Basement Bath Drain/Vent Help

I'm finishing my basement, and adding a bath in the process. I'm hoping to get some help with drain/vent questions. The current stack is right in the middle of where the new shower will be. I'm moving ...
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1answer
63 views

Water flooding out of "Sink Erator/Dishwasher Air Gap

I have a problem with waste water flooding up through the sink erator and all over the kitchen counter, each time the dishwasher is used. I have taken to placing a rag about the erator and capping ...
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1answer
69 views

Can I use existing horizontal tub drain pipe as vent and add new vertical pipe to drain?

I have a bathtub that has horrible drainage and its because of an old galvanized horizontal pipe that connects to the stack. I cannot replace this pipe with PVC with a better slope without ...
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47 views

Can a basement bathroom be vented through a stack servicing sinks on the floor above?

Can a basement bath (toilet, sink and shower) macerating pump system be workably (not codes) vented into a 3" PVC that vents out the roof if the 3" PVC vent pipe also has 2 vanity sinks on the floor ...
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29 views

Can I run a water line behind a stack vent?

I am attempting to move a hose bibb/spigot 10 feet horizontally (from in front of my driveway gate to behind it). The water line comes up from the foundation through a brick exterior wall. My plan was ...
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2answers
45 views

Draining water from an upward drain

My house has a strange bit of plumbing. It's a house flipped by a contractor. It's plumbed for soft water, but there's no sewer near the closet where the plumbing is, and soft water units need a ...
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1answer
260 views

Is there a rule about minimum rise of a vent pipe before it can run horizontal?

I am replacing my shower/bath, including removing the wall that houses the vent pipe (the new unit is free-standing). To make the repiping easier, I want to redirect the tub vent pipe to merge with ...
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2answers
84 views

How does a plumbing vent work?

I would like to better understand the physics behind plumbing vents. Why are they necessary? Does air pass in through the vent? If so, when? Does air pass out through the vent? Is so, when? What would ...
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1answer
143 views

What might be wrong with my sewage ejector pump?

I'm trying to get my sewage ejector pump in my basement working as it used to. The problem is when it runs water pumped from it gushes up the water softener's outlet drain. I thought the vent was ...
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2answers
98 views

How do I attach a new pipe to this vertical ABS pipe?

I have this vertical air exhaust pipe in my attic and I want to feed more things into it. What is the best way to attach more pipes to it? Can I cut a hole into the side with a hole saw, put in the ...
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1answer
60 views

Basement Bathtub Backup

I have 2 family house where 1st floor drainage system working fantastic. Now, 2nd floor bathtub and kitchen sink is connected to my basement bathtub drain. My basement bathtub backs up sometimes and ...
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1answer
65 views

UK Sewage connection - is an external rodding point mandatory

I have a house extension built circa 1997. Inside there is a three-port shallow inspection chamber where a shower and toilet join to a single 110mm waste outlet heading out of the house. Outside the ...
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1answer
169 views

How far from the kitchen sink can a vent pipe be?

We live in a 1960's single floor concrete slab house with concrete block interior/exterior walls. We had to replace the pipes under the slab in the kitchen and currently still have the floor torn up ...
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1answer
41 views

Restrictions on 45 on bottom of vertical Drain Main

I'm getting ready to install a vertical 4" pipe to serve an upstairs bathroom and vent to the roof. At the bottom, in the basement, I want to install 2 45 degree bends to get from the wall out into ...
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34 views

What's the best way to protect plastic drain waste vent pipes from UV damage on a roof?

What is the best way to protect plastic plumbing waste vents (DWV) where they extend above the roof? PVC discolors and gets brittle in the sun, solid ABS gets chalky, foam cellular core ABS bends ...
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1answer
614 views

Can Air Admittance Valve under bathroom sink fix bathtub drain overflow?

In my duplex, when Unit B flushing water down the drain, the bathroom sink and bathtub in Unit A would have sewage overflow up. I researched and I think about using Air Admittance Valve under the ...
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2answers
53 views

Dry gurgling from shower drain

I just randomly heard a loud "dry" gurgling coming from my upstairs shower drain. It was draining slowly (assuming due to all the hair from a house full of females) so we have been using the basement ...
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3answers
273 views

Sewer smell in basement - missing venting or other leak?

I recently started detecting a sewer smell coming from the laundry room in my basement. I think I only trigger it (and not every time) when I run my whole-house fan. I've been running this fan (with ...
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2answers
86 views

How can I tell if a given roof vent is still active, connected?

I'm doing roofing, and looking at a roof vent pipe (e.g. a plumbing drain waste plumbing penetration). It is 1.5" galvanized pipe original to the construction. I see it emerge from the top plates and ...
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1answer
94 views

Not finished walls in electrical room

The electrical room in the basement of the condo building I live (3 floors + basement, top floor has a mezzanine, 8 units total, in Montreal, Canada) has walls not finished. See photos. There are ...
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1answer
48 views

Moving Kitchen sink to opposite side of room

The 1-1/2” drain from the sink currently runs through the back of the cabinet and down into an interior wall to the basement. The new location will be an outside wall. There is currently no visible ...
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1answer
92 views

Connecting ABS at <22.5 degree angle?

I’m trying to get my plumbing vents up into my roof joist bays. They’ll run halfway up the house until they hit a beam. I’m then going to level off the vents so they dip below the beam and connect ...
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2answers
651 views

Can a plumbing vent start in the horizontal where it connects to drain line?

I'm laying out my shower drain and it initially was going to look like this: Fairly straightforward. Shower into p-trap, vent coming out of top of drain line over to wall to be vented, all connected ...
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132 views

Adding utility sink in garage behind existing bathroom

I'd like to add a utility sink to my garage, and there is a bathroom on the other side of the wall that I think I should be able to hook into. In this photo you can see the sink and hot/cold hookups ...

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