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Old 08-02-2012, 10:01 AM   #1
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venting a bathroom sink in a basement


It's a full bath in the basement. The drain from the sink appears to go straight down into the concrete slab. The vent is routed upward about 6 feet, then a 90 degree elbow and it goes another 8 feet across the ceiling of the adjacent laundry room, then another 90 degree elbow and it goes another 4 feet in the same plane, then a third 90 degree elbow and it goes upward and disappears into the first floor subfloor.

I was always under the impression that venting should be as straight and vertical a route as possible. Is the setup that I described acceptable or will we need to find a more direct way to vent that sink?

Thanks in advance.

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Old 08-02-2012, 09:30 PM   #2
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venting a bathroom sink in a basement


I am assuming it is a vent you are talking about. Vents can be run flat if need be. They do not need to be a straight shot through the roof. Your vent should be fine.

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Old 08-02-2012, 10:09 PM   #3
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venting a bathroom sink in a basement


That's great news. Thanks. I figured with gases a horizontal pipe would be fine as long as it is flat or slightly inclined.
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Old 08-02-2012, 10:35 PM   #4
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venting a bathroom sink in a basement


Quote:
Vents can be run flat if need be.
Not right. Vents need to be run slightly inclined on the horizontal (nominally) in case any water gets in the vent pipe. That'll allow it to drain out through the sanitary drain.
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