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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18
votes
9answers
79k views

What can I do about my drains constantly getting blocked?

The one thing I have tried to do about this is use those foaming and non-foaming drain unblockers regularly. That has just been money down the drain, pardon the pun. I suspect that unblockers only ...
17
votes
3answers
28k views

How do I replace this cast iron toilet flange?

I have a big old gawd awful cast iron (at least I think it's cast iron, the house was built in 1940) toilet flange that is in sorry shape. See? There will never be a better time to replace it - as ...
12
votes
9answers
168k views

How can I prevent or remedy “bio slime” accumulation in a sink drain?

The drain in the sink which we use for mouthwash consistently gets clogged by a very repugnant slime. I've tried all the common drain unclogging products (Drano, Liquid Plumber) as well as some non-...
12
votes
4answers
32k views

Do I need a vent for extending a drain to a new bathroom addition?

I am building a new full bathroom on what used to be my back porch. I am planning to extend the existing drain at a cleanout and to run it outside the house underneath the floor. I need to know if I ...
12
votes
2answers
105k views

Does a plumbing vent need to penetrate the roof? (Can it penetrate a wall?)

We're going to move our washer/dryer to the garage (the front loader needs to sit on concrete to keep it from shaking our house to the ground). I'll need to add a washer drain to the garage for the ...
12
votes
2answers
3k views

Why are loop (Chicago) vents typically built with three elbows?

Loop vents, for use where direct vents aren't feasible (such as in kitchen island cabinets), are typically drawn, built, and described as comprising three elbow fittings--two 45-degree elbows and one ...
11
votes
8answers
5k 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 ...
10
votes
6answers
181k views

Sink tailpiece doesn't line up with trap

After installing a new bathroom sink, the drain tailpiece doesn't line up with the trap coming out of the wall. I've seen flexible accordion hoses for this, but I think that violates code (P3002.3.1)....
9
votes
3answers
42k views

Can I vent my bathroom exhaust fan into a plumbing drain vent?

I installed a bathroom fan in the ceiling. My bathroom is in the room right next to the laundry room. The washing machine has the standard drain pipe vent of a pvc pipe venting to the outside ...
8
votes
2answers
30k views

How do I install a sink in a room that doesn't have a drain vent?

I want to install a sink in my attached garage where there is no existing plumbing. I will be running new water supply and drain pipes to mains behind a nearby wall. I'm concerned I will need a ...
8
votes
3answers
33k views

Why is sewage backing up from this outdoor pipe?

I just recently moved into my first house this morning and when I went outside I noticed this: What happened? What should I do? I have no idea what that pipe even is. I don't believe there is a ...
8
votes
4answers
20k views

Can a plumbing vent go up and then back down to the connection with the vent stack?

I am changing the location of all the fixtures in my bathroom. This move will put the toilet and sink on the opposite wall from the stack. I was originally planning on running a vent up the wall ...
7
votes
4answers
25k views

Can I use a PVC cleanout plug in a Cast Iron Cleanout?

There's a cleanout plug on this pipe that I simply can't get loose. I've tried liquid wrench, PB blaster, heating up the area with a torch, everything I can think of. All that's really left is to go ...
7
votes
4answers
61k views

Why are there bubbles in my bathroom toilet and sink?

I have had a lot of really odd things happen in my bathroom this weekend and I want to make sure it is nothing too serious. Ok so when I was taking a shower I heard the toilet bubble up. A few ...
7
votes
2answers
24k views

New Vanity: Sink Won't Drain Completely

My wife and I just replaced the vanity in our bathroom. To fit the new sink, we had to cut some new PVC. Here's a picture. All the plumbing works, without leaks, except that it will not drain ...
7
votes
5answers
138k views

What causes tub drain to gurgle when toilet flushed?

Recently, the drain in my second floor tub makes a gurgling sound when I flush the toilet, which is located right next to the tub. They are obviously on the same drain line. I know that there is a ...
7
votes
1answer
2k views

How do I replace a section of a 4" cast iron pipe with PVC?

I am working on our upstairs bathroom and plan on moving some of the fixtures around to a different side of the room. This means I need to make changes to where the drain comes into the stack (I want ...
6
votes
3answers
26k views

How do you replace a section of cast iron drain pipe?

circa 1929, Boston The kitchen sink connects to cast iron inside the wall. Just below the connection the section of vertical cast iron pipe is rotten and leaking. A couple of feet above it ties into ...
6
votes
2answers
1k views

Is my plan for an air admittance valve ok?

I am in the middle of finishing my basement and want to add a sink that will attach to an existing kitchen drain from above. I don't have a way to vent the sink easily unless I use a Air Admittance ...
6
votes
2answers
73k views

Maximum run on drain?

I'm planning a reconfiguration of my basement and want to move both the powder room and w/d to new locations. The powder room would be close enough to the stack not to worry me, but I'm looking at ...
6
votes
3answers
24k views

Connecting a P-trap to a female drain connector in the wall

I am replacing a bathroom vanity and while I'm doing that, I'm also replacing the p-trap for the sink (mostly because I want one with a drain, but also because I have to raise the height a couple ...
6
votes
3answers
8k views

What could cause my sink to drain slowly?

Sometimes our bathroom sink will drain so slowly (with the water running) that the water will fill it faster than it can drain. However, after shutting the water off and letting it completely subside,...
6
votes
1answer
13k views

How can I lengthen my vent stack and are there any negative effects in doing so?

I have observed that when we receive a lot of snow here in Ontario, at least one of the drain vents on my roof is covered by snow. While after one winter in the house I have not yet observed any ill-...
6
votes
1answer
2k views

Sound proofing a waste pipe

In our (badly designed) flat the upstairs waste pipes run straight through our bedrooms. It's a shame as the outer corridor is right next to our bedroom, so it would have been sensible to put it in ...
6
votes
1answer
36k views

How can I properly vent a basement toilet & shower using an AAV?

When we bought our house the plumbing drains for a basement bathroom were roughed in but they did not install any vent lines for them. We have the first floor plumbing draining into the main stack ...
6
votes
1answer
454 views

Moving some plumbing for a kitchen remodel - loop vent for kitchen island

I just want to make sure my plan for moving some plumbing around for a kitchen remodel is sound. I am moving the kitchen sink from the wall to an island. I've never done a loop vent before and all the ...
5
votes
5answers
10k views

Why do I have a vent stack if none of my fixtures are vented?

As far as I can tell, none of my plumbing fixtures are vented. I have a double-sink in the kitchen, but no vent pipe. My washroom (photo here) similarly has an s-trap. Same thing on my washing machine ...
5
votes
1answer
4k views

Should second trap under kitchen sink S-trap be there?

My kitchen sink drains through an S-trap immediately below the sink to another trap (a P? a U?) in the basement below. The drain pipe then runs along the wall till it meets the main drain pipe shortly ...
5
votes
4answers
138k views

What could cause bubbling toilet when the shower or sink is running?

One of the two toilets in my rental house is bubbling when the shower or sink in that master bath area are on. In the past, about 6 months ago, I have had plumbers and rotoruter out and they could ...
5
votes
2answers
6k views

Is PVC an acceptable pipe for a vent stack through the roof

I'm trying to figure out what type pipe I need for terminating a vent stack in the roof. Is it acceptable to run 1 1/2" schedule 40 PVC through the roof for a new vent stack. This will have 2 ...
5
votes
3answers
24k views

Do I need a separate vent stack for my kitchen sink?

The drain line from my kitchen sink drops down through the basement, into the basement floor (Concrete), and I assume under the floor to the main sewer line. The sink tends to drain slowly. Should I ...
5
votes
3answers
25k views

Why does water and gunk back up through the overflow hole in the bathroom sink?

When I run the water in my bathroom faucet it sometimes (but not all the time) slowly starts to creep up the overflow hole and pour back into the sink. Included with the water is black and grey gunk. ...
5
votes
1answer
184 views

Repairing Damaged Toilet Flange

I've bought an old house, and I've decided to fix a rocking toilet. I found two flange repair kits stacked on top of the original broken toilet flange. When sawing the flange to remove it, I found ...
5
votes
1answer
3k views

Is this an appropriate drain design for adding a shower?

I recently took on the challenge of adding a shower to my existing downstairs bathroom. The bathroom is inside what used to be the garage so it is far away from any existing vents. After some demo, ...
5
votes
2answers
9k views

How many vents are required for drains under a slab and what locations?

I'm working on a layout for plumbing under slab. Currently I'm only planning on venting the system using a single vent stack which will also house a clean-out. Will this pass inspection, or do I need ...
5
votes
2answers
3k views

How can I replace this unusual kitchen sink drain pipe?

I'm trying to replace a broken 1-1/2 inch L-shaped brass pipe under my kitchen sink, as in this picture: At one end, it's connected to the sink drain, which if I'm understanding the terminology ...
5
votes
3answers
1k views

Do I need vents to devices in the primary waste line?

Assuming the system below (solid is waste, dotted is vent). Do I need vents for the Sink C, Toilet C and Toilet B? They are connected to the primary waste line which is vented at the end of it. Sink ...
5
votes
2answers
3k views

Should I use glue or o-ring joints on a buried PVC waste pipe?

What are the advantages and disadvantages of both systems of joints for "non-pressure" pipes that are buried? O-ring joints are more expensive, but easier to do on buried pipes. Glue on the other ...
4
votes
3answers
147k views

When does an under the sink P-Trap assembly need venting?

In the realm of second homeowner woes, I had a P-Trap assembly under the bathroom sink. It was a straight connection to the pipe connected to the main sewer line. (least I think that was the case). It ...
4
votes
2answers
38k views

Persistent sewage smell coming from basement drain

I've recently purchased a house and am now learning all the ins and outs of home maintenance. This summer, I've noticed that I have a very smelly basement drain. Particularly, it smells like sewage. ...
4
votes
2answers
27k views

Should a kitchen sink S-trap be replaced?

Everything I see mentions P-traps. I seem to have instead an S-trap. What are the downsides of this, and is it something that should be fixed?
4
votes
2answers
8k views

Does my vented septic tank even require traps and vents near the actual fixture connections?

My home has a septic system with a vented lid to let the sewer gasses escape from the tank itself. As a result, it seems like far less gas (if any) would travel up the waste plumbing and exit through ...
4
votes
3answers
13k views

How to fix broken toilet flange from over tightened bolt?

I broke my PVC toilet flange when I over-tightened the bolt used to secure the toilet to the flange. How do I fix this without replacing the entire PVC fitting? This PVC flange is glued to the drain ...
4
votes
3answers
43k views

combo tee vs. tee wye

I saw on wikipedia a mention of "combo tee" and "tee wye" is there a difference or are they the same? I've also heard of something called a "sweep" or "long sweep" is that related here?
4
votes
3answers
22k views

Decipher my bathroom rough in

Can someone help me decipher this picture? When I had the house built, the builder roughed in a bathroom for later use. The pipes in this picture are A 2" pipe, possible a vent with a T connector (...
4
votes
2answers
3k views

Is this shower trap better than a P-Trap?

Here in Brazil almost all shower and floor drains are made using a device that translate as "siphoned box" and work as a trap collecting water from the sink, tub and shower. Is that any better (or ...
4
votes
1answer
2k views

How can I install a J-Trap for a bathroom sink with limited space?

Well, it was my first difficult handman project and I got this far... Below is a photo of my installation right now. Every single diagram I've seen has the J-Trap facing down. Is there any way ...
4
votes
1answer
2k views

How far can I move my bath tub trap from the vent?

I am remodeling the master bath and I need to relocate the bath tub. I will be extending the trap about 3-4' from where it is now. I'm wondering if I need to relocate the vent pipe as well. How far ...
4
votes
5answers
68k views

What is the best quick repair for a drain pipe?

In particular, a cast iron drain pipe. It doesn't have to be pretty, but needs to be effective and should last until it can be fixed properly.
4
votes
2answers
317 views

What could cause poor drainage in the kitchen and baths?

After having my septic system (tank) cleaned about a month ago, I've noticed a foul odor in the bathroom of the master bedroom. I've also noticed the smell outside near the master bedroom. It's not ...

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