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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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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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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28 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
78 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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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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48 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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62 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
26 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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1answer
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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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1answer
61 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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26 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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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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53 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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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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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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79 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
37 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
40 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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77 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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36 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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1answer
52 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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19 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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1answer
137 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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1answer
90 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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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
61 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
255 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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33 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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104 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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1answer
215 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
602 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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2answers
185 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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108 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
129 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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49 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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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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1answer
2k 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
52 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
81 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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804 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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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
488 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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2answers
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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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2answers
802 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 ...