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Author:
Matteu8619 (VA)
Hello all, long time reader 1st time poster. I'll do my best to explain, however, I think the picture presents the situation best. I'm renovating a downstairs bath which has a soffit that houses the plumbing, etc. for an upstairs full bath. I want to change the configuration of the bath drain to avoid having an even larger awkward looking soffit.
Waste and overflow has the drain below the tub shoe: drain to street 90 to 12" horizontal run (will slope @ 1/4"/ft) to 90 elbow to tail piece to trap to steel covered no hub fit for pvc and copper. The photo is a bad angle but the drain does wet vent within 5' or less of the trap.
The question...aside from the nightmare of trying to snake 2 90's before the trap and the sludge build up in the horizontal run are there any apparent problems...code violations? Would a long sweep 90 before the tailpiece even help? Any other recommendations?
Many thanks!
Matt
[www.flickr.com]
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Author:
North Carolina Plumber (NC)
That is a code violation, and not a good way to do it. You can have a vertical offset before dropping into the trap but not a horizontal offset. All that horizontal piping before the trap will accumulate decaying grease, debris, hair, skin particles, etc, and there will be no water seal to prevent the odors from coming up thru the tub drain. In your case I'd probably pull another vent in the tub wall, and vent the trap right there at the head of the tub, keeping the trap and vent connection up in the joist, and maybe drilling thru one joist to make the final drain connection.
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Author:
Matteu8619 (VA)
I thought IPC allowed for a 30" horizontal run prior to the trap. Am aware of the buildup possibilities tho.
Edited 1 times.
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Author:
packy (MA)
certainly a double bowl kitchen sink that uses a waste arm with a slip tee has a horizontal offset with two 90 deg change of direction. no violation there??
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Author:
bernabeu (SC)
packy,
that piping is 'exposed' and readily accessible for maintenaince
==============================================
"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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Author:
Matteu8619 (VA)
Still trying to figure out the code violation mentioned? This is what I was working off of:
1002.1 Fixture traps. Each plumbing fixture shall be separately trapped by a water-seal trap, expect as otherwise permitted by this code. The vertical distance from the fixture outlet to the trap weir shall not exceed 24 inches and the horizontal distance shall not exceed 30 inches measured from he centerline of the fixture outlet to the centerline of the inlet of the trap.
I could fit the trap directly below the tub and go through a joist as recommended, but I would need a vertical drop to connect to the existing waste line. It was my understanding if a vertical drop existed the existing pipe would have to be one nominal size larger than the waste line from the tub -- which it is not.
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