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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66 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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41 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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24 views

Should AAV be installed prior to water testing new DWV system?

I'm adding a bathroom in my house and preparing for my rough-in inspection which will involve plugging the main waste line and filling everything with water to test for leaks. I'm using an air ...
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22 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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1answer
51 views

Other options for an air admittance valve besides underneath the sink?

I am re-doing the plumbing in my 1950's house and the ventilation is really poor. I have replaced the entire cast iron stack from the basement sewer up until the beginning of my second floor with PVC....
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26 views

Water softener standpipe question

I have a 1 1/2 inch standpipe coming off of a 2 inch drain pipe in my basement. The only thing before the stand pipe is the kitchen sink. And after the standpipe is a pipe coming down from the washing ...
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36 views

Toilet and given vertical soil stack and no wall space behind

I'm planning out a new second floor bathroom in a historic home and I'm not finding many examples. The best placement for the soil stack is to come up directly under the toilet. The best place for ...
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1answer
79 views

Eliminate center stack to finish basement?

I'd like to eliminate my center stack in order to finish my basement. It's for my hall bath. I have another stack along a perimeter wall inline with the same joist, but around 13 feet away. Will this ...
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41 views

Venting question for new shower install to existing half bath

I am looking to add a shower to my current half bath. I plan on running the shower drain line to the existing toilet waste line. My question is: Do i need to run a separate vent line from the ...
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39 views

Is this product suitable as a solvent cement for abs pipes?

I have this at home: Glue and I need to solvent-weld these abs drain piping: pipe and elbow Can I avoid purchasing solvent cement? Or would that present some problem? Thanks.
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32 views

Basement Bath Drain/Vent Help

I'm finishing my basement, and adding a bath in the process. I'm hoping to get some help with drain/vent questions. The current stack is right in the middle of where the new shower will be. I'm moving ...
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51 views

Water flooding out of "Sink Erator/Dishwasher Air Gap

I have a problem with waste water flooding up through the sink erator and all over the kitchen counter, each time the dishwasher is used. I have taken to placing a rag about the erator and capping ...
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52 views

Can I use existing horizontal tub drain pipe as vent and add new vertical pipe to drain?

I have a bathtub that has horrible drainage and its because of an old galvanized horizontal pipe that connects to the stack. I cannot replace this pipe with PVC with a better slope without ...
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43 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 ...
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29 views

Can I run a water line behind a stack vent?

I am attempting to move a hose bibb/spigot 10 feet horizontally (from in front of my driveway gate to behind it). The water line comes up from the foundation through a brick exterior wall. My plan was ...
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29 views

Draining water from an upward drain

My house has a strange bit of plumbing. It's a house flipped by a contractor. It's plumbed for soft water, but there's no sewer near the closet where the plumbing is, and soft water units need a ...
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1answer
119 views

Is there a rule about minimum rise of a vent pipe before it can run horizontal?

I am replacing my shower/bath, including removing the wall that houses the vent pipe (the new unit is free-standing). To make the repiping easier, I want to redirect the tub vent pipe to merge with ...
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81 views

How does a plumbing vent work?

I would like to better understand the physics behind plumbing vents. Why are they necessary? Does air pass in through the vent? If so, when? Does air pass out through the vent? Is so, when? What would ...
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60 views

What might be wrong with my sewage ejector pump?

I'm trying to get my sewage ejector pump in my basement working as it used to. The problem is when it runs water pumped from it gushes up the water softener's outlet drain. I thought the vent was ...
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66 views

How do I attach a new pipe to this vertical ABS pipe?

I have this vertical air exhaust pipe in my attic and I want to feed more things into it. What is the best way to attach more pipes to it? Can I cut a hole into the side with a hole saw, put in the ...
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1answer
30 views

Basement Bathtub Backup

I have 2 family house where 1st floor drainage system working fantastic. Now, 2nd floor bathtub and kitchen sink is connected to my basement bathtub drain. My basement bathtub backs up sometimes and ...
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43 views

UK Sewage connection - is an external rodding point mandatory

I have a house extension built circa 1997. Inside there is a three-port shallow inspection chamber where a shower and toilet join to a single 110mm waste outlet heading out of the house. Outside the ...
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69 views

How far from the kitchen sink can a vent pipe be?

We live in a 1960's single floor concrete slab house with concrete block interior/exterior walls. We had to replace the pipes under the slab in the kitchen and currently still have the floor torn up ...
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31 views

Restrictions on 45 on bottom of vertical Drain Main

I'm getting ready to install a vertical 4" pipe to serve an upstairs bathroom and vent to the roof. At the bottom, in the basement, I want to install 2 45 degree bends to get from the wall out into ...
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27 views

What's the best way to protect plastic drain waste vent pipes from UV damage on a roof?

What is the best way to protect plastic plumbing waste vents (DWV) where they extend above the roof? PVC discolors and gets brittle in the sun, solid ABS gets chalky, foam cellular core ABS bends ...
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238 views

Can Air Admittance Valve under bathroom sink fix bathtub drain overflow?

In my duplex, when Unit B flushing water down the drain, the bathroom sink and bathtub in Unit A would have sewage overflow up. I researched and I think about using Air Admittance Valve under the ...
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47 views

Dry gurgling from shower drain

I just randomly heard a loud "dry" gurgling coming from my upstairs shower drain. It was draining slowly (assuming due to all the hair from a house full of females) so we have been using the basement ...
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136 views

Sewer smell in basement - missing venting or other leak?

I recently started detecting a sewer smell coming from the laundry room in my basement. I think I only trigger it (and not every time) when I run my whole-house fan. I've been running this fan (with ...
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81 views

How can I tell if a given roof vent is still active, connected?

I'm doing roofing, and looking at a roof vent pipe (e.g. a plumbing drain waste plumbing penetration). It is 1.5" galvanized pipe original to the construction. I see it emerge from the top plates and ...
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1answer
94 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 ...
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1answer
42 views

Moving Kitchen sink to opposite side of room

The 1-1/2” drain from the sink currently runs through the back of the cabinet and down into an interior wall to the basement. The new location will be an outside wall. There is currently no visible ...
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1answer
57 views

Connecting ABS at <22.5 degree angle?

I’m trying to get my plumbing vents up into my roof joist bays. They’ll run halfway up the house until they hit a beam. I’m then going to level off the vents so they dip below the beam and connect ...
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2answers
174 views

Can a plumbing vent start in the horizontal where it connects to drain line?

I'm laying out my shower drain and it initially was going to look like this: Fairly straightforward. Shower into p-trap, vent coming out of top of drain line over to wall to be vented, all connected ...
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54 views

Adding utility sink in garage behind existing bathroom

I'd like to add a utility sink to my garage, and there is a bathroom on the other side of the wall that I think I should be able to hook into. In this photo you can see the sink and hot/cold hookups ...
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68 views

can two fixtures share one vent at a connection?

I'm trying to figure out how to best plumb the drains for a toilet and tub. The toilet is going to be 3" drain and go direction to the main vertical stack. The tub is 2" and is going to connect to ...
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22 views

Roof DWV vent: minimum distance from parapet?

I need to poke a hole in my flat roof (sloped, built-up roof of tar and felt) to accommodate a new vent. The vent will be 2" PVC. Is there a minimum distance from the exterior brick wall to place ...
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141 views

Why do my bathroom sinks smell like death?

Whenever I turn on my bathroom sinks for more than 5 seconds, I can hear gurgling in the walls, and shortly after, a terrible smell fills the bathroom. Is this a problem with my vent lines?
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108 views

Which peninsula sink vent strategy is best for this situation?

I am doing a remodel where I am removing a wall behind my sink to create a peninsula. This wall has my drain waste vent. So as far as code I do know that I cannot go less than 45 degrees (horizontal) ...
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23 views

Vent design for stacked sinks?

I need to establish a new drain and vent for relocated kitchen sinks, deciphering the plumbing code and existing cast iron left me with questions below (also see a proposed design attached). The ...
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26 views

At what point does a vent need to be 6" above the 2nd floor fixture. Basement bath, tie into main stack

Adding a basement bath. I'm confused as to when i can tee into the main 3" stack vent. this would then be a properly sized wet stack vent. Assumes minimum unvented horizontal distances for pipe ...
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1answer
69 views

By how much can I trim back the connectors of 1.5" PVC fittings?

We're installing the drain plumbing for a newly installed tub, and the drain shoe overshoots the tub drain hole. The tub has been mortared in place and can no longer be moved: A joist limits how far ...
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1answer
436 views

Can (must) P-trap be directly underneath the drain in stand-up shower stall?

Can (must) P-trap be directly underneath the drain in stand-up shower stall? I'm roughing in a 48"X36" one piece shower stall with a center drain. In the photo I've just got it dry fit. This is the ...
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19 views

Arranging and venting a waste pipe branch

I recently got ground floor piping extended to get drain, hot and cold in a first floor room. Only the pipes are there, but I'd like to install a sink and a washing machine as from the (VERY schematic)...
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34 views

Is there a simple way to evaluate whether a vent stack is clogged?

I recently spoke with a home owner who has had a number of plumbing issues, ultimately resulting in a new sewer line run from the residence to the main. The homeowner is concerned that there may still ...
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Under slab DWV lines

Just wanted a quick opinion on lay out for my under slab plumbing before I start gluing. Top left 4" pipe is for toilet (17" from each foundation wall, top right 2" is for the vanity. The P-Trap ...
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26 views

Upflush toilet discharge pipe

My upflush unit uses a 3/4" or 1" pvc pipe for pumped discharge. They also say that I should limit the use of 90 degree elbows so should I use 45's or sweep 90"s? Are 2 45"s better or worse than 1 ...
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Sizing branch vent

I have 1-1/2” vents for kitchen sink (loop vent) and bathtub running up the same stud bay. I plan to connect the two before running through top plate and over to the 3” stack. Run is around 20’. Can I ...
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155 views

How wide to trench foundation slab for new plumbing?

What is a good rule of thumb for how wide to cut the trench when adding new drain/waste/vent plumbing to a foundation? Here is a made up example rule similar to what I am hoping to find: Start with ...
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338 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 ...
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1answer
835 views

Why does flushing a downstairs toilet cause an upstairs toilet to also flush?

When we flush the bathroom downstairs, we can hear the toilet upstairs also flush. When the upstairs toilet is flushed, the shower drain gurgles (in the second floor bathroom). I know that something ...

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