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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84 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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25 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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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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42 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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19 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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31 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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7 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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96 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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69 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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19 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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25 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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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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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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18 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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30 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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25 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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56 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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122 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
317 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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1answer
107 views

Why does sink gurgle after installing AAVs in attic?

I recently installed Studor Mini-Vent air admittance valves (AAVs) in my attic on the two secondary (2 inch) plumbing vents (serving laundry room and kitchen) so that the vents no longer penetrate the ...
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87 views

Why is there a drain trap high on a wall above an air gap?

I realize this question is not about "home" improvement but as I had to deal with drain and vent lines recently, I was curious to note this installation at the Costco. There is what it seems a ...
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1answer
99 views

How should I terminate water heater drain pan?

I have a water heater drain pan installed and I'd like to terminate it as close to code as is possible. The pan/water heater is currently in a closet that barely fits the pan. So unfortunately, there ...
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40 views

Difficulty (drain plumbing wise) in splitting a large bathroom on the second floor into two bathrooms?

We have a large main bathroom and we'd like to split it so we have a small master bath and a smaller main bath. Layout wise, door wise, etc, we think it will fit but we're trying to gauge the ...
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996 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 ...
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1k views

90 degree turn in horizontal sink drain

I'm doing a kitchen renovation and moving the location of the sink so that the plumbing stub-outs (supply and drain) need to exit the wall one stud-bay over. I'm also replacing the old galvanized pipe ...
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1answer
47 views

Flashing and/or sealing for vent through built-up roof (BUR)?

I'm reconfiguring plumbing and need to poke a new vent through the roof of my Chicago two-flat. It's a built-up roof of tar, felt, etc., with a slight grade. How to finish the roof portion so that ...
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1answer
72 views

Why aren't vent stacks usually equipped with hats?

On just about every house I've seen here in the west (CA) the vent stacks are just a bare pipe sticking out of the roof. There is no hat on them. I understand that all the vent stack does is vent the ...
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497 views

Horizontal Drains Can Combine Through Wye Laying Flat, Or Can't They?

QUESTION Can horizontal drains combine through a wye in the horizontal position laying flat on its side and not upright at all, Or Can't They? Then see my sketch: Am I doing this right? - Merry IPC ...
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52 views

Can I vent a 3 inch ABS sewer line with a 2 inch pipe?

I will be attaching 1-1/2" vent line from 4 different fixtures (shower, tub, 2 sinks) in the unfinished ceiling above bathroom and also if I can still use it as my main soil stack (2 inch) to protrude ...
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2answers
278 views

Condensate drain line freezing. Need an internal solution

I have a residential 16-SEER four-ton air handler/heat pump unit with a built-in humidifier. Both summer AC condensate and winter humidifier over-run feed into a condensate pump which is on the ...
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114 views

How can I route a toilet drain around copper supply lines right below the slab?

I need to move the toilet back about 3" from where it was originally set to get to the standard 12" rough-in distance. I had to cut the concrete slab and dig into the dirt below. I was planning on ...
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426 views

Can a toilet vent be upstream?

I am relocating the bathroom door and the toilet vent is right in the middle of the new opening. I want to put the vent in the wall behind the toilet which will be upstream of the toilet. Will this ...
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165 views

Faint sewer smell in highrise bathroom during high winds in one direction?

I rent an apartment in a highrise, and often smell a faint sewage smell when there are high north-westerly winds with gusts. Following suggestions on a past Stack Exchange posting, I did the simple ...
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1answer
76 views

Flange recommendation needed. Old flange rusted. New floor higher than older pvc pipe lip

I recently removed the tile and a toilet for a bathroom reno to discover that the flange was completely rusted and the tile had been installed directly on the plywood subfloor. I removed the old ...
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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 ...
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1answer
183 views

Can I add a wye fitting to this cast-iron drain stack?

I recently leased a warehouse space in which I am trying to add a shower to a current half bath. There is a mini basement right below the bathroom which contains the plumbing. Attached is a photo of ...
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979 views

Will a toilet flange bolt cause a problem if dropped into the drain pipe?

I dropped one of the toilet bolts in the drain hole. It's in the basement and set in concrete. I tried to vacuum it out but couldn't. How serious is this, will it get flushed down or do I need to ...
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80 views

Modern half-bath copper DWV configuration

First off: I KNOW PVC is fine. I KNOW PVC is cheap. I KNOW PVC is fast. I KNOW PVC is more flexible. I KNOW PVC would still be working [sarcasm] 300 years after I'm dead. Now that I've sufficiently ...
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Plumbing replacement - Drains, P-traps, and Vents

I'm having a bathroom remodel done that involves replacing the leaky old galvanized steel plumbing with PEX piping. I have zero plumbing experience, but I'm not convinced it's being done properly. ...
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42 views

How to tell if lightly clogged shower drain has a venting problem?

I have a shower drain that was snaked a few months ago and has started having a very light back up again. After maybe 5 seconds of unenthusiastic plunger work, it clears up just fine. But come back an ...
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Are these bends in the tub drain going to be an issue?

Im getting ready to run the drain for my basement bathroom but I'm concerned that I have too many turns in the tub drain. I had to start in the wrong direction in order to pick up a wall for a vent. ...
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2answers
111 views

Are there any options for connecting into main stack for venting branch below waterline?

Are there any options for connecting into main stack for venting branch below waterline? Could I go up for a few feet with a with a wye join and then come back down? The reason for trying to come up ...
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815 views

Is this a proper wet vent?

I have mocked up a bathroom remodel waste line. It is the white pvc in the image. The toilet is 93" away from the stack and is the most downstream fixture. I think I did everything right but I'm still ...
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168 views

DWV: Dirty arm with a tight bend on the end

This is a mock-up of a vanity drain rough-in on a 2-foot "dirty"/trap arm. Ideally the screw fitting that accepts the trap will sit as close to the wall as possible. Is there any reason for this to ...
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767 views

Should I use a sanitary tee or a wye into a diagonal section of pipe?

I'm installing a temporary drain line for a kitchen sink while a remodel is taking place. The most convenient place for me to tie in the temporary line is into a section of 2" cast iron drain line ...
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69 views

How should I seal a drain waste line that I'm no longer using?

The waste line from my kitchen sink is plumbed directly into my side sewer via a dedicated pipe that travels along the exterior of my house before tee-ing into the side sewer line. Apparently this was ...
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78 views

Fixing Shower Without P-Trap

I have a shower on the first floor that does not have a P-trap. A previous owner did some remodeling and the shower drain pipe is plumbed right into the top of the waste line with a tee. You can see ...
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1answer
86 views

Sewer pipe cleanout

My house was built on a slab in1964 and has a walk out basement. There is a floor drain in my basement, along with a toilet & utility sink. Water from the main floor fixtures is backing up through ...