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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24 views

Help with new install of small bathroom in basement?

I'm installing a brand new bathroom in my basement! I'm a DIYer, so after lots of learning, I'm looking for some experienced advice with the layout. I've only done remodels, not new installs. I'm ...
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Which of these options is the safest/most efficient method to plumb a kitchen sink drain in an island?

First, I'm going to try and describe the current (original/builder) configuration. It seems more complicated than it needs to be, but perhaps there's a reason or code that is required. This is a ...
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35 views

Attaching flexible bath drain pipe to dwv pvc pipe

The drain pipe in the image below came with a bathtub I bought. How is it supposed to attach to regular dwv pvc? The inner diameter is about 1.375 inches, although at the two grooves near the end the ...
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Need safe practice info for a very tight space waste drain problem

Please bear with me, as I am no plumber, beyond being able to sweat copper pipe, and glue PVC successfully. Thanks, in advance, for any help you can offer! Here's the simplest version of my question: ...
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1answer
55 views

Adding drain to existing system

I'm looking to add a drain line for a new water softener to my existing drainage system. It happens that where I'd like to install the new drain is right on the other side of the wall from an existing ...
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35 views

New Kitchen sink poor drainage

After installing a new sink water backs up too quickly. If I remove the whole construction and pour directly into the sewer line it flows fine, so no line clog. I think I did mistake in positioning p-...
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1answer
101 views

Is it safe to remove vent and cap off unused drain

I am in the process of renovating my kitchen and removed a wall. I discovered a closed off drain and a vent that goes through the ceiling. There does not appear to be anything else tied into the vent. ...
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1answer
39 views

Weir to vent distance and venting options - IPC 2015

I have a new bathroom which plumbs the shower into the main stack via a 2” PVC pipe. My understanding is that the distance from the trap weir to a (in this case wet) vent can be up to 8”. My shower ...
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1answer
52 views

Moving washing machine from upstairs to the basement

I have a cabin that is in the mountains. When we bought the washing machine is upstairs and we would like to relocate it to the basement where the dryer is. What do we need to pump the water from ...
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65 views

Is this kind of connection for the dishwasher code compliant?

I was recently checking out the plumbing for my dishwasher and noticed an unusual drain setup. The dishwasher drain pipe feeds into a DWV pipe that is open at the top. Is this compliant with plumbing ...
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175 views

Should a plumber automatically choose to auger from the toilet? [closed]

I hired a plumber to clear a clog...toilet wouldnt flush, was bubbling, and water was backing into the shower and sink. He pulled the toilet and started the snake. When he first said he was going to ...
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How to install sink waste line with limited room between garbage disposal with an AAV required

Issue I'm trying to install the waste lines to attach my sink to the sewer line. This is complicated by my garbage disposal being directly in front of my wall hubs, forcing me to divert the lines ...
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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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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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51 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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84 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
216 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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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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111 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
142 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
83 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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54 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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73 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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51 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
100 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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28 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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59 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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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
67 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
209 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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84 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
3k 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
139 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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310 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
214 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
426 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
158 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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5k 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
279 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
200 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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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
334 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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133 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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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
257 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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2answers
3k 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. What is the need for the yard vent? Is this vent a requirement (code or otherwise)? A "best practice&...
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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
160 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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181 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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