Is my plan for an air admittance valve ok?
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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 Valve. The drain will run about 5 feet, make a 90 degree and run another 4 feet. Would the attached diagram work correctly? Anything in blue is the new plumbing.
plumbing sink drain-waste-vent
edited Feb 20 at 21:20
Machavity
7,79511839
asked Feb 20 at 18:30
Shawn StephensShawn Stephens
311
add a comment |
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 Valve. The drain will run about 5 feet, make a 90 degree and run another 4 feet. Would the attached diagram work correctly? Anything in blue is the new plumbing.
plumbing sink drain-waste-vent
edited Feb 20 at 21:20
Machavity
7,79511839
asked Feb 20 at 18:30
Shawn StephensShawn Stephens
311
3
question: isn't the "existing drain from kitchen" already a vented line?
– Leo Lansford
Feb 20 at 19:36
1
In the setup you've drawn, the air admittance valve wouldn't be doing anything that the sink hole itself isn't already doing. The point of vents is to stop moving bodies of water on the sewer side of the trap from sucking the pipe (and trap) dry. Your existing kitchen DWV might already provide enough air as Leo queried above, but if not, put the AAV in the position Isherwood shows in his answer (as long as it's permitted by local code).
– CactusCake
Feb 20 at 20:19
add a comment |
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 Valve. The drain will run about 5 feet, make a 90 degree and run another 4 feet. Would the attached diagram work correctly? Anything in blue is the new plumbing.
plumbing sink drain-waste-vent
edited Feb 20 at 21:20
Machavity
7,79511839
asked Feb 20 at 18:30
Shawn StephensShawn Stephens
311
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 Valve. The drain will run about 5 feet, make a 90 degree and run another 4 feet. Would the attached diagram work correctly? Anything in blue is the new plumbing.
plumbing sink drain-waste-vent
plumbing sink drain-waste-vent
edited Feb 20 at 21:20
Machavity
7,79511839
asked Feb 20 at 18:30
Shawn StephensShawn Stephens
311
edited Feb 20 at 21:20
Machavity
7,79511839
asked Feb 20 at 18:30
Shawn StephensShawn Stephens
311
edited Feb 20 at 21:20
Machavity
7,79511839
edited Feb 20 at 21:20
Machavity
7,79511839
edited Feb 20 at 21:20
Machavity
7,79511839
7,79511839
asked Feb 20 at 18:30
Shawn StephensShawn Stephens
311
asked Feb 20 at 18:30
Shawn StephensShawn Stephens
311
asked Feb 20 at 18:30
Shawn StephensShawn Stephens
311
311
3
question: isn't the "existing drain from kitchen" already a vented line?
– Leo Lansford
Feb 20 at 19:36
1
In the setup you've drawn, the air admittance valve wouldn't be doing anything that the sink hole itself isn't already doing. The point of vents is to stop moving bodies of water on the sewer side of the trap from sucking the pipe (and trap) dry. Your existing kitchen DWV might already provide enough air as Leo queried above, but if not, put the AAV in the position Isherwood shows in his answer (as long as it's permitted by local code).
– CactusCake
Feb 20 at 20:19
add a comment |
3
question: isn't the "existing drain from kitchen" already a vented line?
– Leo Lansford
Feb 20 at 19:36
1
In the setup you've drawn, the air admittance valve wouldn't be doing anything that the sink hole itself isn't already doing. The point of vents is to stop moving bodies of water on the sewer side of the trap from sucking the pipe (and trap) dry. Your existing kitchen DWV might already provide enough air as Leo queried above, but if not, put the AAV in the position Isherwood shows in his answer (as long as it's permitted by local code).
– CactusCake
Feb 20 at 20:19
3
3
question: isn't the "existing drain from kitchen" already a vented line?
– Leo Lansford
Feb 20 at 19:36
question: isn't the "existing drain from kitchen" already a vented line?
– Leo Lansford
Feb 20 at 19:36
1
1
In the setup you've drawn, the air admittance valve wouldn't be doing anything that the sink hole itself isn't already doing. The point of vents is to stop moving bodies of water on the sewer side of the trap from sucking the pipe (and trap) dry. Your existing kitchen DWV might already provide enough air as Leo queried above, but if not, put the AAV in the position Isherwood shows in his answer (as long as it's permitted by local code).
– CactusCake
Feb 20 at 20:19
In the setup you've drawn, the air admittance valve wouldn't be doing anything that the sink hole itself isn't already doing. The point of vents is to stop moving bodies of water on the sewer side of the trap from sucking the pipe (and trap) dry. Your existing kitchen DWV might already provide enough air as Leo queried above, but if not, put the AAV in the position Isherwood shows in his answer (as long as it's permitted by local code).
– CactusCake
Feb 20 at 20:19
add a comment |
1 Answer
1
active
oldest
votes
The valve needs to be downstream of the trap, basically in the position an actual vent would be.
source
Also, be sure they're legal where you are. My local inspector forced me to run a new vent line and tie into the existing stack above the upstairs sink drain when I wanted to add a laundry drain.
answered Feb 20 at 18:34
isherwoodisherwood
49.6k456126
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
votes
The valve needs to be downstream of the trap, basically in the position an actual vent would be.
source
Also, be sure they're legal where you are. My local inspector forced me to run a new vent line and tie into the existing stack above the upstairs sink drain when I wanted to add a laundry drain.
answered Feb 20 at 18:34
isherwoodisherwood
49.6k456126
add a comment |
The valve needs to be downstream of the trap, basically in the position an actual vent would be.
source
Also, be sure they're legal where you are. My local inspector forced me to run a new vent line and tie into the existing stack above the upstairs sink drain when I wanted to add a laundry drain.
answered Feb 20 at 18:34
isherwoodisherwood
49.6k456126
add a comment |
The valve needs to be downstream of the trap, basically in the position an actual vent would be.
source
Also, be sure they're legal where you are. My local inspector forced me to run a new vent line and tie into the existing stack above the upstairs sink drain when I wanted to add a laundry drain.
answered Feb 20 at 18:34
isherwoodisherwood
49.6k456126
The valve needs to be downstream of the trap, basically in the position an actual vent would be.
source
Also, be sure they're legal where you are. My local inspector forced me to run a new vent line and tie into the existing stack above the upstairs sink drain when I wanted to add a laundry drain.
answered Feb 20 at 18:34
isherwoodisherwood
49.6k456126
answered Feb 20 at 18:34
isherwoodisherwood
49.6k456126
answered Feb 20 at 18:34
isherwoodisherwood
49.6k456126
answered Feb 20 at 18:34
isherwoodisherwood
49.6k456126
49.6k456126
add a comment |
add a comment |
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3
question: isn't the "existing drain from kitchen" already a vented line?
– Leo Lansford
Feb 20 at 19:36
1
In the setup you've drawn, the air admittance valve wouldn't be doing anything that the sink hole itself isn't already doing. The point of vents is to stop moving bodies of water on the sewer side of the trap from sucking the pipe (and trap) dry. Your existing kitchen DWV might already provide enough air as Leo queried above, but if not, put the AAV in the position Isherwood shows in his answer (as long as it's permitted by local code).
– CactusCake
Feb 20 at 20:19