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

Filter by
Sorted by
Tagged with
15 votes
2 answers
134k 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 ...
user avatar
  • 23.8k
18 votes
3 answers
32k 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 ...
user avatar
11 votes
7 answers
241k 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)....
user avatar
  • 428
8 votes
5 answers
153k 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 ...
user avatar
  • 33.1k
5 votes
2 answers
35k 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?
user avatar
6 votes
2 answers
11k 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 ...
user avatar
  • 459
12 votes
4 answers
34k 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 ...
user avatar
  • 223
7 votes
4 answers
62k 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 ...
user avatar
5 votes
4 answers
143k 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 ...
user avatar
  • 51
4 votes
3 answers
24k 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 (...
user avatar
3 votes
1 answer
24k views

What is the maximum number of connections to pipes?

Does anyone have a table of the maximum number of connections that drain/vent pipes can have for a given size?
user avatar
3 votes
1 answer
18k views

Why is my toilet bubbling?

Last night while my washing machine and sink in the master bath was running, my master toilet started having air bubbles come up. Then this morning while I was showering I heard bubbles again, and ...
user avatar
1 vote
1 answer
25k views

How long can a sink drain be?

I've read that the rule is 1/4" per foot of drain line. From what I know, the rule is based on the height of the P-trap to where you tie in. What part of the P-trap do you measure from? How low can ...
user avatar
1 vote
0 answers
206 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 ...
user avatar
  • 11
18 votes
9 answers
91k 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 ...
user avatar
  • 501
8 votes
2 answers
34k 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 ...
user avatar
  • 865
7 votes
1 answer
43k 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 ...
user avatar
2 votes
1 answer
9k views

Minimum Height for Vent Pipe

Is there a minimum height for the the vent pipe circled in the image?
user avatar
  • 431
11 votes
2 answers
4k 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 ...
user avatar
  • 106k
11 votes
3 answers
54k 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 ...
user avatar
  • 111
8 votes
3 answers
9k 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,...
user avatar
  • 921
7 votes
1 answer
3k 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 ...
user avatar
  • 5,195
6 votes
3 answers
28k 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 ...
user avatar
  • 368
5 votes
3 answers
28k 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 ...
user avatar
  • 128k
5 votes
1 answer
5k 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 ...
user avatar
4 votes
2 answers
2k views

Repairing leaking DWV vertical 3" thin wall PVC

While painting, my wife discovered some mold on top of the baseboards, and being curious I investigated. What I found pulling the baseboards is they were covered in black mold on the backside, as well ...
user avatar
  • 121
4 votes
1 answer
6k views

What does a vent stack look like?

Excuse my noob question, but what does a vent stack look like? It's pretty easy to tell which pipes are for waste (I can hear the water running through them), and I'm assuming that all of the pipes ...
user avatar
3 votes
1 answer
685 views

Can I use the original drain line after I move my washing machine twenty feet away?

I currently have a washing machine and dryer in the basement and wish to move them both upstairs. I can tap into the same drain line, but it will be about 20' from the old p-trap. Should I install a ...
user avatar
2 votes
1 answer
3k views

Have bath tubs ever been considered "self-venting" in plumbing code?

Years ago, someone told me that a bath tub with an overflow pipe was considered "self-venting". In other words, you didn't need an additional vent pipe because the overflow pipe served the same ...
user avatar
  • 1,025
2 votes
1 answer
11k views

Do I need to add a vent when moving a toilet drain across the bathroom?

In working on finishing our basement, I've come to the bathroom. It was originally plumbed with the plan of having the fixtures share a common wall (vanity, toilet, then tub). so there is already a ...
user avatar
  • 2,008
2 votes
2 answers
4k views

Covering / Cap over DWV vent pipe

I've eliminated a DWV vent pipe during a bathroom remodel (consolidated fixtures and went from 2 vents to 1) but I don't want to mess with roof patching/repairing if I were to undo the penetration of ...
user avatar
  • 983
1 vote
1 answer
105 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 ...
user avatar
  • 165
1 vote
3 answers
3k views

Slow drain after tub-to-shower conversion

I recently hired a plumber for a tub-to-shower conversion into a first floor (slab) master bathroom. I had already removed tub and demo'd the walls, so the scope of work involved: Extending existing ...
user avatar
1 vote
2 answers
51k views

DWV fittings: when to use a sweep instead of an elbow

PVC DWV fittings have a 'tight' elbow and a 'sweep' elbow. Is one for vent and the other for drain/waste? In general, is there a handbook that describes these fittings and explains why you would use ...
user avatar
  • 171
0 votes
0 answers
282 views

Plumbing vent frozen

So I have a frozen vent pipe. A plumber tried to use a snake on it and said he's just getting ice chips. There is no cap on it and of course it's pointed straight up - temperatures have been down ...
user avatar
  • 191