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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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'DWV' PVC pipes ~ Is it ok to have an open inlet in the basement?

Our basement has a openings in the PVC drain-waste-vent (DWV) system, for a washer and water softener to drain. I just realized there's no check valve on this or anything to prevent a sewage backup (...
whiskeychief's user avatar
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Moving a toilet, tying vent to old stack under subfloor or in attic

I’m moving a toilet in a bathroom. It’s essentially just sliding down the main sewer line. The original vent is a 5” cast iron pipe that exits directly through roof. The vanity and tub originally tie ...
Will's user avatar
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2 answers
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Kitchen sink water not draining though there is no clogging

I'm reaching out to you all in a bit of a panic as I'm facing a perplexing issue with my kitchen sink and dishwasher. Recently, I noticed that the water in my kitchen sink was not draining properly. ...
Jackman willow's user avatar
1 vote
1 answer
80 views

Can I eliminate a shower drain by connecting to another stack?

I am remodeling my basement bath that the previous homeowner installed (concrete subfloor). Their shower pan was placed on top of a small, raised platform (~4" tall) which I always thought was ...
Aero Engy's user avatar
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Tying in to vent in basement

What would be the right way to tie into future vent in the basement? I assume F.V. in the picture is Future Vent - especially as its in the basement, so I would hope nothing is "on" it other ...
Warren's user avatar
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2 answers
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Is this safe for venting sewer gas?

I have a PVC vent stack that arises from the concrete floor of a one-level home, and rises straight up through the ceiling, into the attic, and out the roof. The stack is currently in a wall. I want ...
J. Remensperg's user avatar
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1 answer
24 views

Is copper DWV "hard-temper" pipe type M?

I was looking at an FNPT copper adapter online (1-1/2 in. Copper DWV Cup x FIP Female Adapter Fitting) which says "Use with DWV hard-temper tubing" and I'm not sure what hard-temper tubing ...
mr blint's user avatar
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Can I use an AAV instead of a vent pipe for a remote sink?

Our General Contractor added a "temporary" sink in our lower level during our kitchen remodel on the main level. It is the perfect location for a kitchenette downstairs, which has 2 ...
tdfi2003's user avatar
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1 answer
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What would cause a gurgling tub after flushing toilet?

My house is a 1929 colonial. We installed new toilets when we moved in (1 in a second story full bath and 1 in a first floor half bath) and after that point, we would get gurgling in the tub upstairs ...
Sarah with plumbing problems's user avatar
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Plumbing Vent(s) for master Bath

I am currently adding new DWV plumbing for an existing master bathroom space. The space already has a WC and shower with proper drainage and venting. The new addition consists of a soaker tub between ...
user2674256's user avatar
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1 answer
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DWV vs Schedule 40

My downspouts flow into drain that moves rainwater away from the house. I'd like to extend that drain further out. Existing pipe is Schedule40. There shouldn't be any loads going over the new section. ...
ozwegoe's user avatar
1 vote
1 answer
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Does it matter where I reduce a drain pipe?

Central Valley, Hanford, California I want to reduce a 4" line to 3" .. Is it best to reduce it horizontally or vertically, does it matter where I reduce? I was thinking of reducing right ...
farinspace's user avatar
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Black ABS DWV cleanout plug lubricant?

What is the best lubricant for a threaded black ABS DWV cleanout plug? Needs to be long-lasting and not deteriorate the ABS.
Monkeywrench's user avatar
1 vote
0 answers
67 views

Single 2x8 Wall For Back-to-Back Bathrooms with Wall Mount Toilets

House has 2 bathrooms with mirrored fixtures on either side of the “wall”. Currently, this is framed as 2 separate walls with a small chaise in between. Due to the small dimensions in the owner’s ...
Jason Thrasher's user avatar
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Any code issues or other I should be aware of when rerouting a drain?

Central Valley, Hanford, California I am wondering if there will be any code issues rerouting a drain in the center of the kitchen (4" cast-iron) to an exterior wall, where a new wall will be ...
farinspace's user avatar
3 votes
3 answers
1k views

Can a 2" pipe connect vertically to a 3" pipe before it hits the vent?

I have about 2' of 2" pipe coming from my shower. It's well within the required 5' before the 3" vent stack. Can I tie it into the 3" pipe coming from my toilet with a sanitary tee? In ...
sallf's user avatar
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My toilet wont flush properly,but it does flush properly like 1 out of 10 flushes

Okay, my toilet onny flushes once properly out of like 10 to 20 flushes. I’ve already checked the flapper, toilet handle and chain, and checked and tested the fill valve and float. It all is fine, but ...
Kevin G's user avatar
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Bathroom Drain/Vent Design

I have a new bathroom that I'm having trouble figuring out the drains for. Here are the specs: Dimensions: 11' x 5' Construction: 2x4 framing, raised foundation (decent crawlspace), 2 exterior walls (...
diyquestions's user avatar
6 votes
1 answer
134 views

Does this kitchen drain plumbing look correct?

I'm not a plumber by any means, but my kitchen renovation is already very over-budget so figured I'd attempt to connect my sink plumbing myself. I haven't glued this together, it's just dry fitted, ...
Dylan L's user avatar
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2 answers
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My toilet burps air from the toilet tank inlet, not the trap/waste line

My toilet burps air when flushed. The burp comes right at the beginning of the flush. The air is coming out of the inlet from the toilet tank. The air is NOT coming from from the trap/waste line. ...
Lincoln's user avatar
1 vote
2 answers
213 views

Have I properly vented my bathroom remodel?

4 years ago I purchased a 30yrs abandoned home and started doing its remodel. The house is 1 level on a concrete slab and all the plumbing was Cast Iron for drains and galvanized pipes for water. I've ...
Jef's user avatar
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-1 votes
2 answers
317 views

Why are p-trap j-bends reversed depending on application?

Whenever I install P-traps under sinks (eg, usually inside a cabinet or the like, but outside of a wall, using threaded fittings), the asymmetrical J-bend has the straight side towards the drain and ...
tau's user avatar
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5 votes
2 answers
1k views

Is the DWV Tee in this washer service installed backwards?

This is the rough in in question. On the washer service, for the Oatey Sure Vent, is the DMV Tee installed facing the right direction?
Pat's user avatar
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Bathroom plumbing -Is it right?

My 1940 bathroom plumbing was just replaced and I am questioning whether the set-up is proper. Here is a picture. Long 2” pipe at bottom is for the bathtub/shower, fixture at top left is the toilet ...
Stella's user avatar
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126 views

Toilets + sinks leak onto ceiling below; showers do not

Our house has two bathrooms (A and B) upstairs that are back-to-back on the floor plan. Both have showers, sinks, and toilets. One day recently, when I was in an upstairs bathroom (A), the toilet in ...
Dustin Miller's user avatar
2 votes
1 answer
898 views

Basement bathroom rough in drain layout

I have broken up the concrete in my basement for a new bathroom. There are drains that have been roughed in by the builder, but the layout won't work for us so I'm going to rearrange. Hopefully the ...
wintersoldier's user avatar
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1 answer
158 views

Drain cleanout requirements only count horizontal angles?

I've always wondered why drain, waste, vent (DWV) requirements have horizontal angle requirements, but not vertical. What is to prevent me from using a series of 45 degree elbows and exceed 135 ...
tau's user avatar
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1 vote
1 answer
60 views

Washer and Dual Basin Plumbing

I recently purchased this house and noticed the plumbing for the washing machine and basin in the basement was partially removed and capped. I’ve been trying to research how I can route the plumbing, ...
Alexander's user avatar
2 votes
1 answer
83 views

Does a lowered sink drain pipe require a new vent loop?

I needed to replace my dishwasher, and found out that the new one is a bit bigger and does not fit under my counter... There is a 1 1/2" horizontal pipe that passes in front of the wall, under ...
Philippe's user avatar
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3 votes
2 answers
231 views

Plumbing vent odor on rooftop deck

Just bought a place that came with an accessible rooftop and there's a plumbing vent that creates a pretty noticeable odor when near it. Our inspector provided a recommendation to put the vent cap on ...
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1 answer
4k views

How can I clear a clogged drain vent without going on the roof?

I seem to have the classic problem of a clogged vent; flush toilet and shower drain "gasps". Is there a good alternative to going up on the roof and clearing it from there? What's the ...
keshlam's user avatar
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1 answer
645 views

What is the height for the washer box and p-trap? if the finish floor is in the garage 2ft under from bathroom floor. does it work?

Washer machine in the garage is 24" lower than the ff from the bathroom, I'm installing a p-trap 6" from the bathroom finish floor. What is the height of the washer box that needs to be? The ...
E. M. Torres's user avatar
1 vote
2 answers
92 views

How do I trap and vent this new drain line?

I am re-working my laundry area. Previously, it had only one device connected to the drain line - a single sink, into which the washing machine (and everything else) drained. Now I would like to add a ...
negacao's user avatar
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0 votes
0 answers
108 views

3inch vs 4inch PVC drain for a bathroom?

3inch or 4inch PVC for my bathroom? During a remodel of my bathroom we had the old 4inch cast iron drain (vent was also 4 inches) removed. It’s just a single bathroom with 1 toilet 1 sink and 1 shower/...
I Hate Making Names's user avatar
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1 answer
2k views

Can a vent pipe be completely horizontal and level?

I don't know why I am struggling to mind a definitive answer on this. Once a vent pipe is above the flood line of fixtures and goes into the attic, can it run completely level or does it require the ...
Evil Elf's user avatar
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0 answers
138 views

Which specific fittings can be inserted into a 4" SDR-35 floor pipe without cutting the concrete around it?

We're interested in installing a clean-out and drain (separately) into our basement floor pipes installed as such: 4" SDR-35 PVC pipes inner diameter is 3 15/16", outer diameter is 4 3/16&...
Mike Jarema's user avatar
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0 answers
54 views

Branch vent in cold ventilated attic space

We have added a garage with a bedroom and bathroom above it. The bathroom obviously requires ventilation, so I am planning a branch vent from the main stack. The branch will run through the ventilated ...
Matthew Goulart's user avatar
0 votes
1 answer
232 views

How long does a 2 inch schedule 40 PVC pipe need to be to form a close connection between two DWV fittings?

It seems like there should be a table somewhere, but I have not found an answer to this question. Obviously, I could do some trial and error, but I certainly don't want to end up gluing fittings to a ...
Drew's user avatar
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2 votes
1 answer
378 views

How can I vent plumbing without penetrating the roof or walls?

I have a geodesic dome that needs plumbing. I really do not want to make holes in the side of it for plumbing vent. Is it at all possible to design the venting so it would go outside somehow from ...
i--'s user avatar
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2 votes
2 answers
357 views

Plumbing Basement Bathroom review

I'm plumbing a basement bathroom. Here's the basic layout: sink, toilet, shower. Will the pictured setup pass code? All vents are 1.5in. and will be taken to the wall. The 60° elbow on the shower will ...
Luan Oliveira's user avatar
8 votes
3 answers
3k views

Alternative method for connecting sink drain with waste pipe directly under?

This seemed so much easier in my head before I started. The sink drain is just about directly over the waste pipe. I glued this together with two 45s and a 2 to 1 1/2 wye. I need to connect an AAV to ...
Paulz's user avatar
  • 173
2 votes
2 answers
370 views

What kind of a test plug to use for DWV inspection

I'm an owner-builder, getting ready for a close-in inspection which includes plugging and testing the DWV system for a new bathroom. I have a standard 3" test ball that I have used as a test plug ...
5000fingers's user avatar
2 votes
2 answers
846 views

Is this layout for plumbing drains to code?

I'm working on a bathroom reno that involves moving plumbing fixtures. Is my proposed drain layout up to code? I'm in Virginia, so this is the 2018 Virginia Plumbing Code, based on the 2018 IPC. My ...
mmathis's user avatar
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0 votes
1 answer
182 views

Can a plumbing vent pipe be ran between roof rafters?

I live in a cape cod style home, which has knee wall attics. Air from these spaces travels from the soffit vents, between the rafters, into the second floor attic space, then out the ridge vent. I ...
Evil Elf's user avatar
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1 vote
2 answers
182 views

Does this bathroom underslab plumbing plan meet code?

Does this layout look like it would pass inspection in a basement under slab? 3" from sink to sewage pump to act as a "wet vent". 3" to toilet. 2" to shower with a 2" The ...
jAce's user avatar
  • 121
0 votes
1 answer
1k views

How can I wet vent this basement bathroom?

I am roughing in my basement bathroom and I am planning the dwv system right now. I am having trouble understanding how I should be tying in the wet-vent to meet code (Wisconsin) and hoping someone ...
Joe Phillips's user avatar
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1 vote
1 answer
766 views

May a single sink be safely drained through the vent pipe on a sewage ejector pump? [closed]

I have a new bar sink in my basement. The only remaining jobs are to tie the pex lines into the main water lines and to connect the sink drain to the sewage pump. The part that has me a bit troubled ...
person0's user avatar
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1 vote
0 answers
213 views

fixing and combining drains in duplex

I recently bought a home in need of repair. It's a 2 unit property. The kitchens were both draining into a broken tee that was causing some water damage. It is currently a mess of poorly glued PVC + ...
moosefist's user avatar
5 votes
3 answers
853 views

Kitchen sink draining slowly but drains fine with cleanout open

The kitchen sink is draining slowly after the water runs for 10-15 seconds. I've stuck a snake down the cleanout and nothing is there. However, if I leave the cleanout cover off (which is just under ...
et071385's user avatar
1 vote
2 answers
204 views

Can I use DWV Schedule 40 as a short protective sleeve for wiring?

I had to break a hole through a 2-layer thick brick wall to run drain pipe for some new plumbing. This is the original foundation wall of the house, and I broke through into inside space underneath an ...
FreeMan's user avatar
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