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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2answers
47 views

Toilet water drains out slowly after flush

My toilet flushes normally, but after the flush, the water drains out again slowly until the siphon suction breaks (this happens about 10-15 seconds after the flush). This doesn't always happen -- I'...
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4answers
114 views

Can I Run Electrical Wire through sewage pipe/ vent

I'm trying to run new electrical wire from the basement to my 3rd floor apartment. There’s a cast iron vertical sewage pipe that goes in the exact route I’d like the wire to go. But there would be ...
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39 views

Wet Venting Combined Bathroom and Washing Machine

I am about to fully re-do the plumbing in my bathroom and could use some advice on my current layout. I am in a UPC region. This house has a single bath with drain lines in a crawlspace, single story ...
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1answer
51 views

Can a sanitary vent take a jog around an obstacle?

I have a sanitary stack running through a bathroom but enclosed by drywall. The enclosure takes up quite a bit of space in the bathroom but without it the stack would be visibly running through the ...
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1answer
53 views

Can an AAV be in a crawl space if the P trap is also in the crawl space?

I have a situation where the P trap to the washing machine is in the crawl space instead of in the wall. There is no vent. I thought about adding an Air Admittance Vent in the wall (see diagram--...
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30 views

Why does my toilet still get air bubbles?

Bubbles = bad ventilation, right? I've got a 1st story toilet which has air bubbles on every flush. It does not bubble after/before and water is not siphoned out/in when other plumbing is used. I'm ...
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1answer
64 views

Will a doubled P-trap cause problems if it has a vent between the traps?

Our plumber discovered that the drain pipe under our bathroom sink (which is done properly with a P-trap and vent) has a second P-trap down in the crawl space, which is incorrect. I've been ...
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2answers
137 views

What is this pipe? It leaks when the sink runs

I have a pipe that is halfway under a door jamb and inside the concrete floor which when I run a the sink water is now coming out of it. This pipe is next to our AC blower unit inside the basement. I ...
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1answer
42 views

Sound of water running after bath taps turned off

When running a bath, for the duration of my bath I hear water running/heavy trickling coming from the drain away holes at the top of the bath drain. This has got louder and stronger over the last few ...
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0answers
30 views

Plumbing DWV isometric drawing tool (free or <= $40)

I am attempting to learn how to draw isometric drawing for DWV. Does anyone have a recommendation of a good isometric drawing tool for Plumbing DWV? Software, website, etc? Free or <= $40.00 for ...
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1answer
53 views

DWV: Clothes Washer and Utility Sink

I have been going through new houses under construction in my area to learn about Drain, Waste, and Venting (DWV). I found this configuration (reference image below) and it does not look to be correct....
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46 views

Basement Utility Sink Draining into Auxiliary Vent Stack

I want to install a utility sink in my basement. The problem is that the main sewer line is on the other side of the house and there is no way to run a pipe from where I want the sink to the main ...
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1answer
52 views

Reverse osmosis water saddle doesn't fit waste pipe

The reverse osmosis filters waste clamp (40mm) doesnt fit on my waste pipe (50mm) I ordered a 6mm compression fitting to use an npt taper The compression fitting took 3 weeks to arrive and I'm trying ...
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1answer
27 views

What is the dry time where can you pressure test a DWV system after glueing?

I just pressure tested my system and found a leak in some old connections. So I removed them and added some piping. The dry time for use is 2 hours. Is it the same for pressure testing to 5psi?
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41 views

Can you wet vent a sink without dry vent for sink?

Is it possible to attach a sink to a wet vent setup without its own dry vent? I.E. I want to use the existing wet vent for the drainage but I don't want to run a new vent for the sink if I don't have ...
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26 views

New bathroom design - stack pipe

I am trying to add a new bathroom in the attic for kids. Here is idea 1, my doubt is that could I join the toilet drain into the laundry drain? Does that cause any issues like the smell? I am new to ...
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2answers
61 views

Plumbing a washing machine drain in a new location with complications

I want to move the location for the washer hookup in an older house. At the previous location it was a one and a half inch drain and it worked 'okay'.... I am looking at one and a half inch at the new ...
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1answer
82 views

What is the correct way to install an air admittance valve on a 1 1/2" line?

I am installing a new bathroom sink in our basement. The drain line is 1 1/4" into the wall and I plan on using a 1 1/4" trap. I am installing an air admittance valve (code in my area). The ...
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1answer
54 views

How can I add a 2" shower drain into this toilet plumbed configuration?

This type of drain configuration works well in my situation, but I have a 2" shower drain I need to add to this and share the vent. Where and how can I do that? Wye on the horizontal trap arm? ...
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1answer
791 views

What size drain is required for a washing machine?

What is the plumbing Code for Washing Machine Drain? I want to install an extra washer and dryer in my detached two car garage. This is a picture from a house under construction. I believe the Drain ...
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1answer
107 views

How can I connect two plumbing vents in a horizontal run?

I have a vertical vent coming into my basement and I need it to go to a horizontal vent on both sides. for the life of me I am not able to find any kind of vent Tee where its straight up and down ...
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2answers
158 views

Is it ok for a bathroom sink vent to go up and come back down over an obstacle?

I think this question has been asked before but I can't quite find exactly my situation. I'm pretty sure this isn't to code, either, except the IPC code section 905.2 apparently says All vent and ...
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1answer
93 views

Can I vent off the top of a 90 turn down from upper floor?

I'm attempting to add a bathroom to my 3rd floor. I have to run a 3" waste line through a wall on floor 2, down into the ceiling of floor 1 to tie into the existing 3" waste line connecting ...
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3answers
226 views

Can I put a PVC coupling in my vent stack?

I think my vent stack is plugged; I think this because the toilets sound different while flushing than I think they should, and I hear a knocking in the wall when a sink or toilet is flushed. ...
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1answer
103 views

Is my sink trap too high?

Hello I renovated my kitchen and had plumbing moved and replaced. Didn’t really think about the height of the waste pipe before cabinets sink and countertop went in. With new sink and disposal ...
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5answers
3k views

Does my toilet drain poorly because of bad venting?

I have been in the house for about a year and the toilet has always had poor drainage. It doesn't overflow but there's hardly any suction at all when you flush it. The tub next to the toilet drains ...
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1answer
164 views

Basement bathroom — acceptable wet vent to use wye into main sewer line?

I finished my basement and added a bathroom (sink + toilet) and a wet bar (sink). I am using a SaniPLUS system. My original plan was to (reluctantly) run an open air vent from the basement, up ...
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1answer
143 views

Can you use PEX for venting?

Is there such an option as using PEX for an 1-1/2 vent ? I have a stretch where I need some flexibility for my pipe which is going to be difficult to achieve with copper or ABS. this is related to ...
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0answers
33 views

Is this wet venting solution ok?

I am completely redoing my basement bathroom and am wondering if this way of venting the plumbing is ok. From what I've seen, wet venting is the most money and time efficient way to do it, so I would ...
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1answer
166 views

Does code allow flexible PVC for drain through joists?

I need to run a drain line for a sink through a multitude of joists. I could certainly cut 16" pieces of PVC pipe and use couplers to join, but, the numerous joints seems like an excess of places ...
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107 views

Wet Vent in Basement Bathroom

Finishing a bathroom downstairs where the rough waste lines already exist. I live in Michigan, my question is around venting. I have seen AAV's under sinks in this state before, but it looks like ...
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0answers
52 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
126 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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1answer
969 views

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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0answers
50 views

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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2answers
140 views

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
88 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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149 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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0answers
112 views

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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0answers
13 views

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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0answers
81 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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0answers
160 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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0answers
35 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
47 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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8answers
8k views

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
162 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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0answers
51 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
112 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
53 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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0answers
31 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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